Historical Monthly Mean Water Levels from the Coordinated network for each of the Great Lakes

Lake Superior monthly mean water levels in metres referred to IGLD 1985

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yearly
Average
Minimum
Monthly
Maximum
Monthly
Range
1918 183.25 183.20 183.17 183.14 183.22 183.34 183.40 183.43 183.45 183.44 183.46 183.44 183.33 183.14 183.46 0.32
1919 183.38 183.32 183.28 183.31 183.38 183.45 183.48 183.47 183.46 183.42 183.43 183.39 183.40 183.28 183.48 0.20
1920 183.29 183.27 183.28 183.36 183.43 183.52 183.58 183.60 183.54 183.50 183.43 183.36 183.43 183.27 183.60 0.33
1921 183.31 183.22 183.18 183.23 183.35 183.44 183.48 183.50 183.50 183.44 183.35 183.27 183.36 183.18 183.50 0.32
1922 183.17 183.11 183.09 183.15 183.29 183.36 183.45 183.50 183.52 183.45 183.39 183.31 183.32 183.09 183.52 0.43
1923 183.23 183.15 183.12 183.11 183.18 183.21 183.27 183.30 183.32 183.30 183.28 183.22 183.22 183.11 183.32 0.21
1924 183.15 183.07 183.01 183.02 183.05 183.09 183.12 183.20 183.26 183.28 183.20 183.11 183.13 183.01 183.28 0.27
1925 183.02 182.96 182.93 182.94 182.98 183.06 183.12 183.16 183.15 183.10 183.01 182.92 183.03 182.92 183.16 0.24
1926 182.83 182.76 182.74 182.72 182.76 182.85 182.96 183.02 183.12 183.19 183.18 183.19 182.94 182.72 183.19 0.47
1927 183.12 183.08 183.07 183.12 183.27 183.39 183.50 183.52 183.50 183.49 183.44 183.38 183.32 183.07 183.52 0.45
1928 183.31 183.24 183.20 183.25 183.36 183.44 183.56 183.62 183.69 183.74 183.68 183.57 183.47 183.20 183.74 0.54
1929 183.46 183.42 183.44 183.47 183.47 183.51 183.57 183.56 183.56 183.55 183.52 183.44 183.50 183.42 183.57 0.15
1930 183.37 183.34 183.30 183.28 183.39 183.48 183.58 183.58 183.53 183.53 183.47 183.42 183.44 183.28 183.58 0.30
1931 183.33 183.25 183.18 183.16 183.22 183.30 183.39 183.41 183.40 183.42 183.43 183.42 183.33 183.16 183.43 0.27
1932 183.37 183.34 183.30 183.28 183.38 183.45 183.52 183.58 183.58 183.48 183.45 183.38 183.43 183.28 183.58 0.30
1933 183.32 183.28 183.24 183.28 183.43 183.52 183.56 183.57 183.57 183.57 183.53 183.47 183.44 183.24 183.57 0.33
1934 183.42 183.37 183.34 183.36 183.47 183.55 183.58 183.55 183.58 183.61 183.59 183.55 183.50 183.34 183.61 0.27
1935 183.47 183.42 183.40 183.40 183.47 183.53 183.62 183.65 183.63 183.57 183.52 183.44 183.51 183.40 183.65 0.25
1936 183.39 183.34 183.33 183.35 183.51 183.59 183.59 183.57 183.57 183.51 183.43 183.33 183.46 183.33 183.59 0.26
1937 183.31 183.29 183.27 183.27 183.42 183.50 183.54 183.60 183.61 183.58 183.57 183.49 183.45 183.27 183.61 0.34
1938 183.42 183.38 183.35 183.43 183.62 183.72 183.73 183.72 183.69 183.61 183.57 183.49 183.56 183.35 183.73 0.38
1939 183.46 183.43 183.40 183.42 183.52 183.66 183.75 183.75 183.71 183.62 183.51 183.43 183.56 183.40 183.75 0.35
1940 183.33 183.25 183.18 183.16 183.28 183.45 183.53 183.55 183.53 183.48 183.46 183.39 183.38 183.16 183.55 0.39
1941 183.32 183.25 183.18 183.21 183.34 183.44 183.49 183.52 183.61 183.71 183.66 183.57 183.44 183.18 183.71 0.53
1942 183.48 183.41 183.38 183.38 183.51 183.59 183.61 183.62 183.65 183.64 183.65 183.60 183.54 183.38 183.65 0.27
1943 183.53 183.49 183.45 183.44 183.56 183.73 183.80 183.80 183.75 183.67 183.59 183.48 183.61 183.44 183.80 0.36
1944 183.36 183.28 183.24 183.23 183.38 183.55 183.66 183.76 183.78 183.70 183.62 183.52 183.51 183.23 183.78 0.55
1945 183.42 183.38 183.38 183.51 183.53 183.56 183.63 183.65 183.70 183.64 183.58 183.52 183.54 183.38 183.70 0.32
1946 183.45 183.40 183.36 183.42 183.45 183.52 183.60 183.61 183.62 183.62 183.63 183.57 183.52 183.36 183.63 0.27
1947 183.47 183.38 183.32 183.36 183.49 183.67 183.75 183.74 183.73 183.66 183.57 183.46 183.55 183.32 183.75 0.43
1948 183.37 183.27 183.21 183.27 183.40 183.42 183.46 183.51 183.53 183.45 183.43 183.40 183.39 183.21 183.53 0.32
1949 183.33 183.28 183.22 183.24 183.36 183.44 183.57 183.64 183.60 183.60 183.56 183.48 183.44 183.22 183.64 0.42
1950 183.42 183.37 183.33 183.37 183.57 183.74 183.82 183.86 183.83 183.82 183.77 183.69 183.63 183.33 183.86 0.53
1951 183.57 183.51 183.52 183.59 183.71 183.75 183.80 183.80 183.83 183.84 183.79 183.70 183.70 183.51 183.84 0.33
1952 183.63 183.56 183.50 183.52 183.58 183.62 183.77 183.86 183.82 183.67 183.52 183.46 183.63 183.46 183.86 0.40
1953 183.37 183.32 183.28 183.33 183.40 183.57 183.69 183.72 183.67 183.57 183.45 183.40 183.48 183.28 183.72 0.44
1954 183.31 183.25 183.20 183.22 183.44 183.57 183.62 183.59 183.52 183.47 183.41 183.33 183.41 183.20 183.62 0.42
1955 183.24 183.17 183.16 183.21 183.30 183.37 183.39 183.47 183.45 183.49 183.47 183.40 183.34 183.16 183.49 0.33
1956 183.31 183.25 183.16 183.16 183.22 183.32 183.43 183.48 183.48 183.42 183.37 183.30 183.32 183.16 183.48 0.32
1957 183.21 183.13 183.12 183.14 183.26 183.35 183.46 183.48 183.48 183.43 183.40 183.34 183.32 183.12 183.48 0.36
1958 183.26 183.21 183.16 183.14 183.18 183.24 183.36 183.40 183.47 183.44 183.43 183.37 183.30 183.14 183.47 0.33
1959 183.28 183.21 183.19 183.18 183.29 183.40 183.46 183.52 183.63 183.64 183.56 183.44 183.40 183.18 183.64 0.46
1960 183.37 183.30 183.22 183.24 183.47 183.56 183.56 183.55 183.53 183.45 183.40 183.34 183.42 183.22 183.56 0.34
1961 183.24 183.18 183.17 183.19 183.29 183.36 183.38 183.38 183.42 183.41 183.39 183.33 183.31 183.17 183.42 0.25
1962 183.24 183.18 183.15 183.15 183.25 183.35 183.38 183.41 183.47 183.45 183.35 183.28 183.30 183.15 183.47 0.32
1963 183.19 183.14 183.11 183.18 183.24 183.35 183.41 183.44 183.44 183.41 183.36 183.29 183.30 183.11 183.44 0.33
1964 183.21 183.15 183.09 183.09 183.30 183.41 183.48 183.51 183.54 183.51 183.45 183.36 183.34 183.09 183.54 0.45
1965 183.28 183.21 183.16 183.18 183.31 183.38 183.41 183.44 183.43 183.45 183.41 183.39 183.34 183.16 183.45 0.29
1966 183.33 183.27 183.26 183.28 183.36 183.47 183.49 183.54 183.52 183.47 183.42 183.37 183.40 183.26 183.54 0.28
1967 183.31 183.26 183.21 183.29 183.39 183.45 183.50 183.53 183.49 183.44 183.41 183.34 183.38 183.21 183.53 0.32
1968 183.26 183.19 183.14 183.23 183.33 183.49 183.63 183.72 183.79 183.78 183.71 183.61 183.49 183.14 183.79 0.65
1969 183.56 183.53 183.46 183.46 183.55 183.57 183.58 183.59 183.54 183.50 183.44 183.35 183.51 183.35 183.59 0.24
1970 183.30 183.24 183.19 183.18 183.36 183.50 183.59 183.61 183.60 183.59 183.65 183.60 183.45 183.18 183.65 0.47
1971 183.51 183.45 183.44 183.47 183.56 183.66 183.70 183.70 183.67 183.65 183.62 183.56 183.58 183.44 183.70 0.26
1972 183.48 183.42 183.42 183.43 183.55 183.58 183.60 183.68 183.71 183.68 183.60 183.49 183.55 183.42 183.71 0.29
1973 183.43 183.36 183.38 183.43 183.58 183.67 183.73 183.80 183.80 183.74 183.65 183.58 183.60 183.36 183.80 0.44
1974 183.50 183.44 183.39 183.40 183.52 183.63 183.72 183.77 183.79 183.77 183.76 183.69 183.62 183.39 183.79 0.40
1975 183.62 183.57 183.51 183.46 183.55 183.62 183.69 183.68 183.66 183.60 183.59 183.58 183.59 183.46 183.69 0.23
1976 183.49 183.42 183.40 183.49 183.57 183.59 183.63 183.62 183.55 183.46 183.35 183.24 183.48 183.24 183.63 0.39
1977 183.16 183.10 183.13 183.20 183.27 183.31 183.40 183.44 183.58 183.65 183.62 183.54 183.37 183.10 183.65 0.55
1978 183.48 183.36 183.31 183.30 183.35 183.44 183.52 183.57 183.61 183.55 183.43 183.34 183.44 183.30 183.61 0.31
1979 183.25 183.21 183.24 183.31 183.50 183.65 183.68 183.68 183.67 183.61 183.60 183.53 183.49 183.21 183.68 0.47
1980 183.47 183.40 183.33 183.35 183.39 183.43 183.46 183.49 183.55 183.53 183.46 183.37 183.44 183.33 183.55 0.22
1981 183.27 183.22 183.22 183.32 183.40 183.47 183.51 183.49 183.41 183.38 183.35 183.28 183.36 183.22 183.51 0.29
1982 183.23 183.16 183.13 183.19 183.35 183.41 183.50 183.57 183.58 183.65 183.67 183.61 183.42 183.13 183.67 0.54
1983 183.56 183.49 183.47 183.48 183.51 183.59 183.64 183.63 183.61 183.64 183.61 183.58 183.57 183.47 183.64 0.17
1984 183.49 183.44 183.40 183.39 183.49 183.59 183.65 183.66 183.63 183.61 183.58 183.55 183.54 183.39 183.66 0.27
1985 183.48 183.42 183.41 183.45 183.58 183.66 183.74 183.81 183.86 183.91 183.89 183.81 183.67 183.41 183.91 0.50
1986 183.70 183.63 183.61 183.68 183.74 183.76 183.81 183.84 183.81 183.79 183.75 183.67 183.73 183.61 183.84 0.23
1987 183.58 183.50 183.44 183.41 183.42 183.46 183.50 183.55 183.53 183.46 183.40 183.37 183.47 183.37 183.58 0.21
1988 183.29 183.22 183.17 183.20 183.24 183.26 183.27 183.39 183.44 183.41 183.46 183.46 183.32 183.17 183.46 0.29
1989 183.41 183.33 183.28 183.31 183.39 183.50 183.53 183.52 183.50 183.41 183.38 183.27 183.40 183.27 183.53 0.26
1990 183.19 183.13 183.09 183.08 183.18 183.25 183.35 183.36 183.38 183.39 183.38 183.31 183.26 183.08 183.39 0.31
1991 183.23 183.16 183.14 183.22 183.32 183.37 183.46 183.46 183.44 183.43 183.46 183.45 183.34 183.14 183.46 0.32
1992 183.37 183.30 183.25 183.22 183.32 183.36 183.45 183.47 183.52 183.54 183.50 183.47 183.40 183.22 183.54 0.32
1993 183.41 183.32 183.24 183.24 183.38 183.48 183.56 183.62 183.62 183.58 183.52 183.46 183.45 183.24 183.62 0.38
1994 183.39 183.32 183.28 183.30 183.40 183.46 183.53 183.56 183.59 183.56 183.50 183.42 183.44 183.28 183.59 0.31
1995 183.33 183.24 183.19 183.20 183.26 183.31 183.37 183.40 183.44 183.49 183.48 183.41 183.34 183.19 183.49 0.30
1996 183.34 183.32 183.30 183.31 183.46 183.60 183.70 183.78 183.78 183.71 183.67 183.63 183.55 183.30 183.78 0.48
1997 183.59 183.54 183.51 183.55 183.64 183.65 183.72 183.68 183.64 183.61 183.56 183.48 183.60 183.48 183.72 0.24
1998 183.40 183.34 183.29 183.35 183.34 183.39 183.41 183.38 183.33 183.26 183.21 183.19 183.32 183.19 183.41 0.22
1999 183.12 183.10 183.06 183.11 183.20 183.31 183.43 183.47 183.44 183.38 183.32 183.24 183.27 183.06 183.47 0.41
2000 183.16 183.08 183.08 183.12 183.16 183.24 183.33 183.31 183.27 183.20 183.15 183.06 183.18 183.06 183.33 0.27
2001 182.98 182.94 182.91 183.01 183.24 183.33 183.36 183.39 183.37 183.30 183.29 183.30 183.20 182.91 183.39 0.48
2002 183.22 183.14 183.11 183.14 183.26 183.31 183.36 183.40 183.42 183.44 183.36 183.26 183.29 183.11 183.44 0.33
2003 183.16 183.07 183.03 183.08 183.18 183.23 183.26 183.29 183.27 183.26 183.23 183.19 183.19 183.03 183.29 0.26
2004 183.14 183.07 183.07 183.13 183.23 183.35 183.40 183.42 183.46 183.47 183.46 183.38 183.30 183.07 183.47 0.40
2005 183.32 183.27 183.22 183.26 183.31 183.39 183.42 183.38 183.35 183.38 183.35 183.30 183.33 183.22 183.42 0.20
2006 183.24 183.18 183.12 183.16 183.24 183.30 183.31 183.30 183.20 183.13 183.04 182.98 183.18 182.98 183.31 0.33
2007 182.92 182.83 182.78 182.85 182.87 182.94 183.00 183.01 183.02 183.18 183.18 183.11 182.97 182.78 183.18 0.40
2008 183.08 183.03 182.97 183.01 183.18 183.29 183.41 183.42 183.37 183.32 183.27 183.19 183.21 182.97 183.42 0.45
2009 183.14 183.10 183.09 183.12 183.24 183.30 183.34 183.39 183.42 183.36 183.35 183.30 183.26 183.09 183.42 0.33
2010 183.21 183.14 183.09 183.08 183.08 183.13 183.19 183.20 183.22 183.19 183.14 183.07 183.15 183.07 183.22 0.15
2011 183.00 182.93 182.87 182.91 183.04 183.15 183.25 183.28 183.23 183.21 183.16 183.09 183.09 182.87 183.28 0.41
2012 183.01 182.94 182.93 183.00 183.06 183.20 183.30 183.27 183.20 183.13 183.11 183.06 183.10 182.93 183.30 0.37
2013 182.98 182.94 182.91 182.90 183.11 183.26 183.37 183.44 183.48 183.45 183.40 183.35 183.22 182.90 183.48 0.58

All-Time

Average 183.32 183.26 183.22 183.25 183.35 183.44 183.50 183.53 183.53 183.50 183.46 183.40 183.40 183.21 183.56 0.35
Minimum 182.83 182.76 182.74 182.72 182.76 182.85 182.96 183.01 183.02 183.10 183.01 182.92 182.94 182.72 183.16 0.15
Maximum 183.70 183.63 183.61 183.68 183.74 183.76 183.82 183.86 183.86 183.91 183.89 183.81 183.73 183.61 183.91 0.65

2004-2013

Average 183.10 183.04 183.01 183.04 183.14 183.23 183.30 183.31 183.30 183.28 183.25 183.18

Lake Superior water levels in metres referred to Chart Datum

2013 -0.22 -0.26 -0.29 -0.30 -0.09 0.06 0.17 0.24 0.28 0.25 0.20 0.15
All-Time
Average 0.12 0.06 0.02 0.05 0.15 0.24 0.30 0.33 0.33 0.30 0.26 0.19
Minimum -0.37 -0.44 -0.46 -0.48 -0.44 -0.35 -0.24 -0.19 -0.18 -0.10 -0.19 -0.28
Maximum 0.50 0.43 0.41 0.48 0.54 0.56 0.62 0.66 0.66 0.71 0.69 0.61

Lake Michigan-Huron monthly mean water levels in metres referred to IGLD 1985

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yearly
Average
Minimum
Monthly
Maximum
Monthly
Range
1918 176.71 176.73 176.80 176.89 176.99 177.07 177.07 177.01 176.94 176.83 176.82 176.78 176.89 176.71 177.07 0.36
1919 176.74 176.68 176.68 176.77 176.89 176.92 176.88 176.83 176.72 176.66 176.62 176.55 176.74 176.55 176.92 0.37
1920 176.50 176.47 176.49 176.63 176.68 176.73 176.79 176.76 176.73 176.65 176.57 176.50 176.62 176.47 176.79 0.32
1921 176.44 176.42 176.42 176.54 176.63 176.64 176.60 176.54 176.50 176.44 176.35 176.34 176.49 176.34 176.64 0.30
1922 176.27 176.24 176.28 176.43 176.57 176.63 176.67 176.63 176.56 176.46 176.35 176.25 176.44 176.24 176.67 0.43
1923 176.16 176.13 176.15 176.22 176.34 176.41 176.42 176.40 176.36 176.29 176.18 176.11 176.26 176.11 176.42 0.31
1924 176.06 176.05 176.06 176.11 176.24 176.28 176.33 176.38 176.33 176.24 176.12 176.04 176.19 176.04 176.38 0.34
1925 175.95 175.92 175.94 175.96 175.98 176.00 176.03 175.99 175.92 175.84 175.76 175.74 175.92 175.74 176.03 0.29
1926 175.69 175.66 175.69 175.79 175.88 175.99 176.02 176.03 176.02 175.97 175.93 175.95 175.88 175.66 176.03 0.37
1927 175.92 175.94 176.00 176.08 176.20 176.30 176.34 176.31 176.22 176.21 176.14 176.12 176.15 175.92 176.34 0.42
1928 176.10 176.11 176.15 176.29 176.44 176.50 176.59 176.62 176.60 176.61 176.65 176.66 176.44 176.10 176.66 0.56
1929 176.65 176.63 176.65 176.86 177.07 177.15 177.18 177.13 177.03 176.90 176.82 176.68 176.90 176.63 177.18 0.55
1930 176.64 176.64 176.66 176.69 176.76 176.79 176.84 176.80 176.69 176.57 176.42 176.31 176.65 176.31 176.84 0.53
1931 176.21 176.17 176.16 176.17 176.19 176.20 176.20 176.14 176.05 176.02 175.97 175.94 176.12 175.94 176.21 0.27
1932 175.94 175.93 175.91 175.95 176.02 176.04 176.05 176.01 175.95 175.87 175.84 175.78 175.94 175.78 176.05 0.27
1933 175.74 175.73 175.73 175.83 175.99 176.06 176.08 176.02 175.92 175.83 175.76 175.72 175.87 175.72 176.08 0.36
1934 175.70 175.67 175.67 175.74 175.81 175.84 175.87 175.84 175.82 175.76 175.72 175.76 175.77 175.67 175.87 0.20
1935 175.74 175.74 175.78 175.85 175.91 175.97 176.05 176.04 175.96 175.91 175.89 175.85 175.89 175.74 176.05 0.31
1936 175.83 175.81 175.85 175.92 176.01 176.07 176.06 176.00 176.02 175.99 175.91 175.80 175.94 175.80 176.07 0.27
1937 175.82 175.82 175.84 175.86 176.00 176.04 176.06 176.04 176.01 175.92 175.86 175.80 175.92 175.80 176.06 0.26
1938 175.76 175.85 175.92 176.08 176.16 176.28 176.33 176.35 176.34 176.28 176.21 176.13 176.14 175.76 176.35 0.59
1939 176.07 176.07 176.10 176.15 176.29 176.40 176.45 176.46 176.44 176.35 176.27 176.18 176.27 176.07 176.46 0.39
1940 176.09 176.07 176.03 176.04 176.12 176.20 176.25 176.27 176.26 176.19 176.11 176.07 176.14 176.03 176.27 0.24
1941 176.08 176.08 176.06 176.09 176.17 176.19 176.16 176.11 176.09 176.12 176.17 176.14 176.12 176.06 176.19 0.13
1942 176.12 176.13 176.17 176.29 176.38 176.50 176.52 176.50 176.44 176.38 176.33 176.25 176.33 176.12 176.52 0.40
1943 176.25 176.27 176.33 176.43 176.58 176.77 176.88 176.92 176.88 176.80 176.75 176.66 176.63 176.25 176.92 0.67
1944 176.57 176.54 176.54 176.57 176.64 176.69 176.72 176.68 176.64 176.60 176.52 176.45 176.60 176.45 176.72 0.27
1945 176.36 176.33 176.36 176.45 176.55 176.72 176.78 176.74 176.70 176.66 176.62 176.57 176.57 176.33 176.78 0.45
1946 176.56 176.57 176.65 176.70 176.70 176.75 176.77 176.69 176.60 176.49 176.42 176.32 176.60 176.32 176.77 0.45
1947 176.28 176.28 176.25 176.39 176.57 176.72 176.80 176.81 176.77 176.72 176.65 176.56 176.57 176.25 176.81 0.56
1948 176.48 176.42 176.47 176.61 176.72 176.73 176.72 176.67 176.57 176.40 176.32 176.26 176.53 176.26 176.73 0.47
1949 176.20 176.19 176.19 176.26 176.31 176.34 176.38 176.34 176.22 176.14 176.02 175.94 176.21 175.94 176.38 0.44
1950 175.96 175.99 176.02 176.17 176.27 176.34 176.42 176.44 176.43 176.40 176.34 176.35 176.26 175.96 176.44 0.48
1951 176.34 176.34 176.41 176.58 176.75 176.82 176.91 176.93 176.92 176.93 176.95 176.95 176.74 176.34 176.95 0.61
1952 176.95 176.96 176.96 177.08 177.17 177.22 177.26 177.28 177.22 177.06 176.94 176.92 177.08 176.92 177.28 0.36
1953 176.85 176.82 176.83 176.91 177.00 177.07 177.12 177.11 177.02 176.92 176.81 176.74 176.93 176.74 177.12 0.38
1954 176.63 176.60 176.64 176.71 176.83 176.92 176.96 176.94 176.90 176.98 176.95 176.89 176.83 176.60 176.98 0.38
1955 176.83 176.78 176.76 176.82 176.88 176.91 176.88 176.79 176.64 176.54 176.46 176.38 176.72 176.38 176.91 0.53
1956 176.31 176.30 176.32 176.37 176.50 176.57 176.62 176.62 176.56 176.45 176.37 176.29 176.44 176.29 176.62 0.33
1957 176.22 176.19 176.17 176.20 176.28 176.35 176.43 176.38 176.33 176.24 176.21 176.16 176.26 176.16 176.43 0.27
1958 176.15 176.13 176.12 176.14 176.12 176.12 176.15 176.11 176.07 175.98 175.91 175.81 176.07 175.81 176.15 0.34
1959 175.75 175.75 175.79 175.92 176.06 176.11 176.12 176.12 176.10 176.10 176.13 176.12 176.01 175.75 176.13 0.38
1960 176.14 176.16 176.14 176.24 176.50 176.64 176.72 176.77 176.73 176.64 176.57 176.48 176.48 176.14 176.77 0.63
1961 176.38 176.31 176.33 176.36 176.42 176.44 176.46 176.45 176.43 176.38 176.32 176.26 176.38 176.26 176.46 0.20
1962 176.20 176.17 176.19 176.26 176.34 176.37 176.36 176.32 176.26 176.17 176.06 175.97 176.22 175.97 176.37 0.40
1963 175.89 175.85 175.85 175.94 176.02 176.06 176.04 176.03 175.98 175.90 175.80 175.71 175.92 175.71 176.06 0.35
1964 175.63 175.59 175.58 175.61 175.74 175.76 175.78 175.77 175.76 175.70 175.65 175.62 175.68 175.58 175.78 0.20
1965 175.60 175.62 175.67 175.77 175.94 176.00 176.02 176.04 176.07 176.10 176.07 176.09 175.92 175.60 176.10 0.50
1966 176.10 176.08 176.13 176.20 176.26 176.30 176.28 176.24 176.17 176.08 176.01 176.08 176.16 176.01 176.30 0.29
1967 176.07 176.07 176.06 176.23 176.35 176.45 176.50 176.48 176.40 176.34 176.34 176.32 176.30 176.06 176.50 0.44
1968 176.29 176.30 176.27 176.35 176.40 176.47 176.55 176.58 176.60 176.57 176.50 176.48 176.45 176.27 176.60 0.33
1969 176.47 176.47 176.45 176.54 176.70 176.82 176.94 176.95 176.86 176.78 176.73 176.64 176.70 176.45 176.95 0.50
1970 176.59 176.56 176.53 176.58 176.68 176.76 176.80 176.78 176.77 176.73 176.69 176.67 176.68 176.53 176.80 0.27
1971 176.63 176.62 176.68 176.76 176.86 176.94 176.96 176.96 176.90 176.84 176.76 176.75 176.80 176.62 176.96 0.34
1972 176.73 176.65 176.65 176.72 176.88 176.93 176.99 177.05 177.07 177.03 177.00 176.96 176.89 176.65 177.07 0.42
1973 176.98 176.95 176.98 177.10 177.20 177.30 177.30 177.29 177.21 177.13 177.04 177.00 177.12 176.95 177.30 0.35
1974 176.95 176.97 177.00 177.07 177.19 177.28 177.32 177.26 177.15 177.04 176.98 176.91 177.09 176.91 177.32 0.41
1975 176.87 176.86 176.87 176.92 177.06 177.14 177.15 177.10 177.07 176.95 176.87 176.82 176.97 176.82 177.15 0.33
1976 176.76 176.75 176.87 177.02 177.11 177.15 177.15 177.08 176.95 176.80 176.64 176.51 176.90 176.51 177.15 0.64
1977 176.42 176.38 176.44 176.56 176.57 176.55 176.56 176.54 176.53 176.50 176.50 176.51 176.50 176.38 176.57 0.19
1978 176.48 176.45 176.43 176.51 176.61 176.67 176.69 176.68 176.71 176.70 176.62 176.54 176.59 176.43 176.71 0.28
1979 176.51 176.48 176.54 176.71 176.88 176.95 176.98 177.00 176.96 176.88 176.83 176.81 176.79 176.48 177.00 0.52
1980 176.78 176.72 176.68 176.77 176.84 176.90 176.93 176.93 176.90 176.82 176.72 176.65 176.80 176.65 176.93 0.28
1981 176.59 176.56 176.60 176.67 176.75 176.80 176.82 176.81 176.80 176.73 176.66 176.59 176.70 176.56 176.82 0.26
1982 176.51 176.46 176.45 176.56 176.62 176.66 176.69 176.69 176.65 176.62 176.60 176.67 176.60 176.45 176.69 0.24
1983 176.67 176.66 176.68 176.76 176.90 177.02 177.02 176.98 176.93 176.87 176.77 176.74 176.83 176.66 177.02 0.36
1984 176.70 176.70 176.72 176.81 176.91 177.01 177.06 177.04 177.02 176.96 176.93 176.88 176.90 176.70 177.06 0.36
1985 176.88 176.86 176.98 177.14 177.24 177.25 177.23 177.19 177.20 177.16 177.19 177.20 177.13 176.86 177.25 0.39
1986 177.14 177.11 177.12 177.23 177.28 177.33 177.39 177.39 177.38 177.50 177.38 177.26 177.29 177.11 177.50 0.39
1987 177.18 177.10 177.06 177.07 177.06 177.07 177.04 176.99 176.90 176.79 176.70 176.68 176.97 176.68 177.18 0.50
1988 176.63 176.60 176.57 176.67 176.70 176.67 176.61 176.57 176.48 176.42 176.43 176.42 176.56 176.42 176.70 0.28
1989 176.38 176.33 176.32 176.41 176.44 176.56 176.57 176.54 176.47 176.34 176.27 176.18 176.40 176.18 176.57 0.39
1990 176.15 176.16 176.19 176.27 176.35 176.44 176.51 176.49 176.45 176.41 176.39 176.39 176.35 176.15 176.51 0.36
1991 176.36 176.31 176.33 176.48 176.60 176.66 176.64 176.59 176.48 176.40 176.38 176.40 176.47 176.31 176.66 0.35
1992 176.38 176.36 176.38 176.44 176.53 176.52 176.54 176.53 176.52 176.49 176.52 176.54 176.48 176.36 176.54 0.18
1993 176.54 176.51 176.48 176.58 176.70 176.82 176.91 176.88 176.83 176.76 176.70 176.64 176.70 176.48 176.91 0.43
1994 176.57 176.56 176.59 176.63 176.70 176.72 176.82 176.81 176.78 176.71 176.66 176.59 176.68 176.56 176.82 0.26
1995 176.53 176.49 176.47 176.49 176.58 176.64 176.63 176.64 176.55 176.46 176.44 176.41 176.53 176.41 176.64 0.23
1996 176.37 176.39 176.39 176.46 176.63 176.76 176.83 176.84 176.82 176.80 176.79 176.77 176.65 176.37 176.84 0.47
1997 176.79 176.82 176.89 176.95 177.07 177.13 177.19 177.16 177.12 177.02 176.89 176.78 176.98 176.78 177.19 0.41
1998 176.74 176.71 176.74 176.89 176.91 176.90 176.88 176.80 176.68 176.55 176.44 176.36 176.72 176.36 176.91 0.55
1999 176.27 176.28 176.24 176.25 176.28 176.34 176.40 176.36 176.24 176.14 176.04 175.99 176.24 175.99 176.40 0.41
2000 175.92 175.87 175.90 175.92 176.00 176.10 176.13 176.13 176.09 175.98 175.89 175.81 175.98 175.81 176.13 0.32
2001 175.77 175.78 175.78 175.85 175.95 176.06 176.05 176.03 176.01 176.03 176.05 176.05 175.95 175.77 176.06 0.29
2002 175.99 175.95 175.99 176.06 176.19 176.29 176.33 176.32 176.24 176.14 176.01 175.91 176.12 175.91 176.33 0.42
2003 175.82 175.75 175.73 175.82 175.92 176.00 176.04 176.02 175.94 175.87 175.89 175.90 175.89 175.73 176.04 0.31
2004 175.87 175.84 175.90 175.98 176.12 176.31 176.37 176.33 176.28 176.15 176.10 176.08 176.11 175.84 176.37 0.53
2005 176.08 176.10 176.10 176.14 176.19 176.21 176.19 176.17 176.09 176.00 175.93 175.88 176.09 175.88 176.21 0.33
2006 175.88 175.92 175.93 176.01 176.09 176.14 176.14 176.13 176.04 175.99 175.94 175.98 176.02 175.88 176.14 0.26
2007 176.00 175.91 175.92 176.02 176.06 176.08 176.05 176.00 175.95 175.88 175.77 175.68 175.94 175.68 176.08 0.40
2008 175.70 175.76 175.78 175.92 176.04 176.16 176.24 176.22 176.18 176.09 176.00 175.97 176.01 175.70 176.24 0.54
2009 176.01 176.01 176.09 176.20 176.34 176.42 176.44 176.44 176.37 176.29 176.27 176.22 176.26 176.01 176.44 0.43
2010 176.15 176.11 176.09 176.11 176.13 176.19 176.26 176.24 176.16 176.07 175.96 175.86 176.11 175.86 176.26 0.40
2011 175.81 175.78 175.81 175.91 176.10 176.21 176.26 176.24 176.13 176.08 176.07 176.04 176.04 175.78 176.26 0.48
2012 175.99 175.96 176.00 176.03 176.05 176.07 176.04 175.97 175.86 175.74 175.67 175.61 175.92 175.61 176.07 0.46
2013 175.57 175.61 175.63 175.75 175.93 176.05 176.09 176.08 176.04 176.01 176.01 175.97 175.90 175.57 176.09 0.52

All-Time

Average 176.29 176.28 176.29 176.38 176.47 176.54 176.57 176.55 176.50 176.43 176.37 176.32 176.42 176.20 176.58 0.38
Minimum 175.57 175.59 175.58 175.61 175.74 175.76 175.78 175.77 175.76 175.70 175.65 175.61 175.68 175.57 175.78 0.13
Maximum 177.18 177.11 177.12 177.23 177.28 177.33 177.39 177.39 177.38 177.50 177.38 177.26 177.29 177.11 177.50 0.67

2004-2013

Average 175.91 175.90 175.93 176.01 176.11 176.18 176.21 176.18 176.11 176.03 175.97 175.93

Lakes Michigan-Huron water levels in metres referred to Chart Datum

2013 -0.43 -0.39 -0.37 -0.25 -0.07 0.05 0.09 0.08 0.04 0.01 0.01 -0.03
All-Time
Average 0.29 0.28 0.29 0.38 0.47 0.54 0.57 0.55 0.50 0.43 0.37 0.32
Minimum -0.43 -0.41 -0.42 -0.39 -0.26 -0.24 -0.22 -0.23 -0.24 -0.30 -0.35 -0.39
Maximum 1.18 1.11 1.12 1.23 1.28 1.33 1.39 1.39 1.38 1.50 1.38 1.26

Lake St. Clair monthly mean water levels in metres referred to IGLD 1985

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yearly
Average
Minimum
Monthly
Maximum
Monthly
Range
1918 174.59 174.74 174.74 174.84 175.00 175.14 175.17 175.16 175.10 175.03 174.98 174.99 174.96 174.59 175.17 0.58
1919 175.14 174.88 175.00 175.14 175.30 175.32 175.25 175.16 175.06 175.00 174.91 174.76 175.08 174.76 175.32 0.56
1920 174.30 174.40 174.58 174.82 174.95 175.01 175.07 175.08 175.01 174.92 174.84 174.81 174.82 174.30 175.08 0.78
1921 174.87 174.43 174.80 175.00 175.07 175.08 175.06 174.97 174.88 174.77 174.74 174.76 174.87 174.43 175.08 0.65
1922 174.58 174.39 174.62 174.92 174.99 175.00 175.07 175.02 174.97 174.83 174.69 174.65 174.81 174.39 175.07 0.68
1923 174.53 174.40 174.52 174.63 174.76 174.82 174.85 174.79 174.75 174.66 174.56 174.56 174.65 174.40 174.85 0.45
1924 174.58 174.29 174.41 174.63 174.76 174.81 174.88 174.85 174.79 174.71 174.52 174.42 174.64 174.29 174.88 0.59
1925 174.28 174.18 174.39 174.52 174.51 174.52 174.55 174.54 174.48 174.36 174.30 174.24 174.41 174.18 174.55 0.37
1926 173.94 173.89 174.08 174.32 174.48 174.53 174.58 174.60 174.60 174.62 174.57 174.61 174.40 173.89 174.62 0.73
1927 174.26 174.12 174.35 174.65 174.73 174.83 174.88 174.83 174.71 174.64 174.54 174.64 174.60 174.12 174.88 0.76
1928 174.61 174.46 174.35 174.73 174.84 174.94 175.06 175.05 174.94 174.90 174.89 174.89 174.80 174.35 175.06 0.71
1929 175.01 175.13 175.09 175.32 175.48 175.49 175.52 175.44 175.34 175.20 175.10 175.05 175.26 175.01 175.52 0.51
1930 175.07 174.98 175.21 175.29 175.29 175.26 175.27 175.19 175.07 174.97 174.80 174.74 175.10 174.74 175.29 0.55
1931 174.57 174.15 174.13 174.56 174.66 174.70 174.72 174.67 174.58 174.51 174.43 174.42 174.51 174.13 174.72 0.59
1932 174.56 174.60 174.35 174.58 174.68 174.69 174.66 174.60 174.57 174.46 174.45 174.59 174.57 174.35 174.69 0.34
1933 174.45 174.26 174.41 174.66 174.76 174.77 174.77 174.70 174.58 174.46 174.36 174.38 174.55 174.26 174.77 0.51
1934 174.01 174.04 174.05 174.36 174.42 174.45 174.50 174.41 174.34 174.27 174.18 174.26 174.27 174.01 174.50 0.49
1935 174.21 173.93 174.22 174.37 174.44 174.50 174.57 174.57 174.48 174.38 174.36 174.30 174.36 173.93 174.57 0.64
1936 173.88 174.13 174.36 174.49 174.56 174.59 174.55 174.48 174.49 174.45 174.36 174.38 174.39 173.88 174.59 0.71
1937 174.48 174.38 174.47 174.61 174.74 174.77 174.83 174.78 174.66 174.54 174.42 174.56 174.60 174.38 174.83 0.45
1938 174.28 174.51 174.41 174.74 174.79 174.85 174.90 174.90 174.84 174.78 174.67 174.60 174.69 174.28 174.90 0.62
1939 174.64 174.13 174.38 174.80 174.87 174.94 174.97 174.93 174.89 174.78 174.70 174.62 174.72 174.13 174.97 0.84
1940 174.36 174.23 174.30 174.69 174.72 174.84 174.88 174.86 174.82 174.76 174.62 174.66 174.64 174.23 174.88 0.65
1941 174.56 174.28 174.42 174.58 174.69 174.75 174.73 174.68 174.62 174.60 174.54 174.53 174.58 174.28 174.75 0.47
1942 174.42 174.07 174.42 174.83 174.90 175.03 175.04 175.02 174.94 174.90 174.82 174.82 174.77 174.07 175.04 0.97
1943 174.70 174.57 174.84 174.99 175.25 175.36 175.44 175.41 175.34 175.24 175.14 175.07 175.11 174.57 175.44 0.87
1944 174.53 174.68 174.74 175.09 175.18 175.23 175.22 175.16 175.09 175.04 174.93 174.89 174.98 174.53 175.23 0.70
1945 174.73 174.62 174.89 175.03 175.18 175.28 175.33 175.28 175.22 175.24 175.10 175.17 175.09 174.62 175.33 0.71
1946 174.96 174.60 175.04 175.12 175.15 175.29 175.30 175.21 175.10 175.00 174.89 174.80 175.04 174.60 175.30 0.70
1947 174.61 174.60 174.75 175.15 175.26 175.41 175.40 175.38 175.34 175.22 175.09 175.04 175.10 174.60 175.41 0.81
1948 174.98 174.90 175.07 175.22 175.35 175.32 175.32 175.24 175.13 174.96 174.86 174.82 175.10 174.82 175.35 0.53
1949 174.89 174.88 174.70 174.94 174.96 174.98 175.00 174.93 174.80 174.75 174.58 174.57 174.83 174.57 175.00 0.43
1950 174.72 174.70 174.71 175.04 175.05 175.04 175.07 175.02 175.01 174.95 174.86 174.99 174.93 174.70 175.07 0.37
1951 174.86 174.89 175.12 175.25 175.34 175.38 175.41 175.38 175.31 175.29 175.26 175.40 175.24 174.86 175.41 0.55
1952 175.49 175.41 175.51 175.59 175.60 175.63 175.66 175.65 175.57 175.41 175.24 175.23 175.50 175.23 175.66 0.43
1953 175.25 175.21 175.29 175.32 175.41 175.49 175.52 175.49 175.39 175.29 175.16 175.06 175.32 175.06 175.52 0.46
1954 174.81 174.74 175.13 175.29 175.36 175.39 175.41 175.38 175.30 175.39 175.33 175.29 175.24 174.74 175.41 0.67
1955 175.30 175.15 175.36 175.38 175.41 175.43 175.40 175.35 175.22 175.09 174.98 174.95 175.25 174.95 175.43 0.48
1956 174.38 174.24 174.78 174.98 175.24 175.22 175.24 175.25 175.19 175.04 174.87 174.84 174.94 174.24 175.25 1.01
1957 174.57 174.58 174.80 174.94 175.02 175.03 175.14 175.06 174.98 174.88 174.76 174.80 174.88 174.57 175.14 0.57
1958 174.47 174.30 174.65 174.56 174.73 174.76 174.82 174.80 174.76 174.64 174.51 174.55 174.63 174.30 174.82 0.52
1959 174.18 174.28 174.59 174.75 174.83 174.86 174.81 174.79 174.73 174.70 174.65 174.71 174.66 174.18 174.86 0.68
1960 174.72 174.54 174.71 174.97 175.07 175.21 175.24 175.25 175.20 175.09 174.94 174.94 174.99 174.54 175.25 0.71
1961 174.76 174.76 174.93 175.02 175.16 175.14 175.12 175.12 175.04 174.92 174.83 174.76 174.96 174.76 175.16 0.40
1962 174.70 174.38 174.79 174.86 174.89 174.94 174.90 174.88 174.82 174.74 174.70 174.64 174.77 174.38 174.94 0.56
1963 174.48 174.36 174.53 174.68 174.72 174.72 174.69 174.66 174.60 174.50 174.40 174.38 174.56 174.36 174.72 0.36
1964 174.14 174.14 174.32 174.45 174.54 174.53 174.52 174.50 174.44 174.32 174.24 174.24 174.36 174.14 174.54 0.40
1965 174.14 174.20 174.44 174.58 174.64 174.68 174.66 174.66 174.64 174.60 174.56 174.60 174.53 174.14 174.68 0.54
1966 174.64 174.58 174.71 174.81 174.90 174.93 174.91 174.85 174.78 174.62 174.60 174.75 174.76 174.58 174.93 0.35
1967 174.76 174.64 174.76 174.94 175.01 175.07 175.10 175.06 174.98 174.92 174.90 174.96 174.92 174.64 175.10 0.46
1968 174.91 175.02 175.00 175.04 175.08 175.15 175.20 175.18 175.14 175.03 174.97 175.01 175.06 174.91 175.20 0.29
1969 175.00 175.06 175.07 175.24 175.36 175.42 175.54 175.49 175.38 175.26 175.18 175.14 175.26 175.00 175.54 0.54
1970 174.77 174.88 175.07 175.17 175.22 175.31 175.32 175.30 175.25 175.20 175.15 175.16 175.15 174.77 175.32 0.55
1971 175.14 175.06 175.23 175.29 175.34 175.40 175.40 175.40 175.37 175.28 175.16 175.16 175.27 175.06 175.40 0.34
1972 175.22 175.20 175.25 175.32 175.45 175.48 175.54 175.54 175.53 175.49 175.51 175.52 175.42 175.20 175.54 0.34
1973 175.56 175.54 175.68 175.73 175.74 175.82 175.82 175.76 175.66 175.56 175.46 175.47 175.65 175.46 175.82 0.36
1974 175.56 175.57 175.67 175.71 175.77 175.76 175.77 175.70 175.60 175.46 175.39 175.40 175.61 175.39 175.77 0.38
1975 175.44 175.45 175.48 175.56 175.58 175.64 175.62 175.60 175.61 175.48 175.36 175.37 175.52 175.36 175.64 0.28
1976 175.37 175.32 175.61 175.64 175.69 175.66 175.68 175.62 175.50 175.36 175.18 175.11 175.48 175.11 175.69 0.58
1977 175.10 175.16 175.15 175.26 175.30 175.24 175.24 175.22 175.22 175.18 175.10 175.22 175.20 175.10 175.30 0.20
1978 175.33 175.31 175.27 175.38 175.38 175.38 175.35 175.29 175.25 175.18 175.10 175.03 175.27 175.03 175.38 0.35
1979 175.16 175.16 175.18 175.40 175.44 175.48 175.50 175.49 175.47 175.36 175.30 175.33 175.36 175.16 175.50 0.34
1980 175.36 175.32 175.32 175.50 175.49 175.53 175.53 175.56 175.50 175.35 175.23 175.20 175.41 175.20 175.56 0.36
1981 174.91 175.21 175.22 175.26 175.36 175.40 175.46 175.43 175.42 175.38 175.28 175.22 175.30 174.91 175.46 0.55
1982 175.28 175.20 175.32 175.40 175.37 175.40 175.40 175.34 175.26 175.18 175.18 175.26 175.30 175.18 175.40 0.22
1983 175.26 175.25 175.30 175.41 175.55 175.59 175.60 175.60 175.48 175.38 175.34 175.44 175.43 175.25 175.60 0.35
1984 175.39 175.36 175.50 175.02 175.46 175.58 175.60 175.58 175.52 175.46 175.40 175.35 175.44 175.02 175.60 0.58
1985 175.48 175.56 175.72 175.81 175.79 175.79 175.76 175.72 175.68 175.60 175.73 175.76 175.70 175.48 175.81 0.33
1986 175.80 175.80 175.80 175.82 175.83 175.92 175.93 175.90 175.84 175.96 175.82 175.80 175.85 175.80 175.96 0.16
1987 175.77 175.62 175.56 175.71 175.66 175.66 175.66 175.60 175.52 175.36 175.29 175.32 175.56 175.29 175.77 0.48
1988 175.33 175.28 175.24 175.33 175.33 175.30 175.24 175.20 175.10 175.00 174.99 174.98 175.19 174.98 175.33 0.35
1989 175.02 175.04 174.96 175.10 175.14 175.32 175.34 175.26 175.20 175.04 174.93 174.96 175.11 174.93 175.34 0.41
1990 174.90 175.02 175.08 175.10 175.16 175.21 175.26 175.25 175.24 175.16 175.09 175.10 175.13 174.90 175.26 0.36
1991 175.24 175.12 175.19 175.27 175.34 175.39 175.34 175.30 175.19 175.04 174.96 174.99 175.20 174.96 175.39 0.43
1992 175.01 175.04 175.10 175.18 175.25 175.26 175.33 175.35 175.36 175.24 175.28 175.24 175.22 175.01 175.36 0.35
1993 175.40 175.26 175.34 175.42 175.43 175.48 175.56 175.51 175.44 175.30 175.21 175.22 175.38 175.21 175.56 0.35
1994 175.06 175.16 175.18 175.32 175.37 175.40 175.49 175.48 175.39 175.29 175.18 175.16 175.29 175.06 175.49 0.43
1995 175.22 175.09 175.08 175.19 175.26 175.31 175.34 175.35 175.22 175.08 175.05 175.01 175.18 175.01 175.35 0.34
1996 174.74 175.01 175.00 174.85 175.31 175.45 175.50 175.48 175.47 175.42 175.36 175.37 175.25 174.74 175.50 0.76
1997 175.52 175.51 175.62 175.62 175.68 175.81 175.83 175.76 175.68 175.55 175.41 175.36 175.61 175.36 175.83 0.47
1998 175.45 175.47 175.52 175.61 175.63 175.58 175.56 175.48 175.35 175.19 175.00 174.93 175.40 174.93 175.63 0.70
1999 175.10 174.99 174.96 175.05 175.05 175.11 175.12 175.07 174.96 174.85 174.75 174.70 174.98 174.70 175.12 0.42
2000 174.63 174.44 174.66 174.76 174.85 174.96 175.05 175.03 174.93 174.80 174.65 174.75 174.79 174.44 175.05 0.61
2001 174.71 174.69 174.70 174.74 174.79 174.89 174.89 174.81 174.75 174.73 174.70 174.74 174.76 174.69 174.89 0.20
2002 174.69 174.77 174.80 174.94 175.03 175.09 175.10 175.05 174.96 174.84 174.72 174.62 174.88 174.62 175.10 0.48
2003 174.60 174.60 174.53 174.73 174.82 174.89 174.92 174.92 174.82 174.69 174.65 174.68 174.74 174.53 174.92 0.39
2004 174.68 174.66 174.77 174.86 175.00 175.12 175.15 175.12 175.07 174.89 174.82 174.86 174.92 174.66 175.15 0.49
2005 174.99 175.00 174.99 175.08 175.08 175.05 175.03 174.96 174.90 174.82 174.65 174.71 174.94 174.65 175.08 0.43
2006 174.73 174.80 174.84 174.88 174.93 174.99 175.02 175.01 174.92 174.86 174.85 174.87 174.89 174.73 175.02 0.29
2007 174.97 174.86 174.91 174.96 175.02 174.99 174.92 174.90 174.83 174.70 174.56 174.56 174.85 174.56 175.02 0.46
2008 174.66 174.85 174.88 174.99 175.00 175.05 175.12 175.05 175.01 174.85 174.77 174.81 174.92 174.66 175.12 0.46
2009 174.94 174.96 175.06 175.14 175.20 175.25 175.24 175.20 175.13 174.99 174.94 174.87 175.08 174.87 175.25 0.38
2010 174.74 174.44 174.76 174.90 174.98 175.08 175.09 175.05 174.92 174.85 174.72 174.70 174.85 174.44 175.09 0.65
2011 174.48 174.50 174.67 174.89 175.15 175.22 175.21 175.16 175.08 175.02 174.95 175.08 174.95 174.48 175.22 0.74
2012 175.02 174.99 174.99 174.99 174.98 174.98 174.94 174.85 174.75 174.61 174.59 174.54 174.85 174.54 175.02 0.48
2013 174.52 174.54 174.64 174.75 174.84 174.99 175.10 175.02 174.96 174.85 174.79 174.79 174.82 174.52 175.10 0.58

All-Time

Average 174.83 174.78 174.90 175.03 175.12 175.16 175.18 175.15 175.08 174.98 174.90 174.90 175.00 174.69 175.20 0.51
Minimum 173.88 173.89 174.05 174.32 174.42 174.45 174.50 174.41 174.34 174.27 174.18 174.24 174.27 173.88 174.50 0.16
Maximum 175.80 175.80 175.80 175.82 175.83 175.92 175.93 175.90 175.84 175.96 175.82 175.80 175.85 175.80 175.96 1.01

2004-2013

Average 174.77 174.76 174.85 174.94 175.02 175.07 175.08 175.03 174.96 174.84 174.76 174.78

Lake St. Clair water levels in metres referred to Chart Datum

2013 0.12 0.14 0.24 0.35 0.44 0.59 0.70 0.62 0.56 0.45 0.39 0.39
All-Time
Average 0.43 0.38 0.50 0.63 0.72 0.76 0.78 0.75 0.68 0.58 0.50 0.50
Minimum -0.52 -0.51 -0.35 -0.08 0.02 0.05 0.10 0.01 -0.06 -0.13 -0.22 -0.16
Maximum 1.40 1.40 1.40 1.42 1.43 1.52 1.53 1.50 1.44 1.56 1.42 1.40

Lake Erie monthly mean water levels in metres referred to IGLD 1985

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yearly
Average
Minimum
Monthly
Maximum
Monthly
Range
1918 173.90 173.82 174.01 174.02 173.98 174.10 174.12 174.09 174.09 174.02 174.02 174.01 174.02 173.82 174.12 0.30
1919 174.00 174.00 174.11 174.25 174.46 174.49 174.39 174.29 174.18 174.08 174.03 173.89 174.18 173.89 174.49 0.60
1920 173.72 173.55 173.57 173.81 174.04 174.09 174.13 174.13 174.06 173.96 173.91 173.93 173.91 173.55 174.13 0.58
1921 173.92 173.88 173.97 174.15 174.26 174.24 174.20 174.09 174.00 173.89 173.85 173.86 174.03 173.85 174.26 0.41
1922 173.78 173.66 173.75 174.05 174.17 174.20 174.16 174.08 174.02 173.88 173.74 173.64 173.93 173.64 174.20 0.56
1923 173.66 173.56 173.64 173.78 173.89 173.94 173.93 173.85 173.80 173.69 173.62 173.73 173.76 173.56 173.94 0.38
1924 173.76 173.72 173.68 173.84 173.99 174.04 174.08 174.00 173.91 173.84 173.66 173.60 173.84 173.60 174.08 0.48
1925 173.51 173.48 173.63 173.73 173.71 173.69 173.66 173.66 173.61 173.49 173.48 173.47 173.59 173.47 173.73 0.26
1926 173.37 173.32 173.34 173.61 173.70 173.71 173.70 173.73 173.76 173.85 173.82 173.78 173.64 173.32 173.85 0.53
1927 173.68 173.62 173.66 173.85 173.93 174.01 174.00 173.94 173.84 173.73 173.68 173.88 173.82 173.62 174.01 0.39
1928 173.89 173.88 173.77 173.90 173.97 174.07 174.16 174.12 173.99 173.90 173.87 173.90 173.95 173.77 174.16 0.39
1929 173.92 173.98 174.12 174.41 174.64 174.62 174.60 174.48 174.34 174.23 174.20 174.20 174.31 173.92 174.64 0.72
1930 174.38 174.32 174.42 174.54 174.53 174.47 174.40 174.26 174.15 174.02 173.90 173.85 174.27 173.85 174.54 0.69
1931 173.78 173.67 173.58 173.68 173.78 173.84 173.86 173.80 173.71 173.64 173.56 173.56 173.70 173.56 173.86 0.30
1932 173.74 173.82 173.77 173.82 173.90 173.90 173.86 173.79 173.69 173.54 173.51 173.49 173.74 173.49 173.90 0.41
1933 173.57 173.54 173.62 173.84 173.98 173.96 173.88 173.77 173.65 173.52 173.41 173.38 173.68 173.38 173.98 0.60
1934 173.34 173.22 173.20 173.38 173.44 173.45 173.45 173.43 173.38 173.30 173.20 173.19 173.33 173.19 173.45 0.26
1935 173.21 173.18 173.29 173.40 173.51 173.57 173.60 173.60 173.49 173.38 173.36 173.34 173.41 173.18 173.60 0.42
1936 173.24 173.18 173.38 173.60 173.70 173.69 173.66 173.59 173.53 173.49 173.43 173.37 173.49 173.18 173.70 0.52
1937 173.55 173.74 173.70 173.82 174.01 174.06 174.13 174.06 173.90 173.72 173.62 173.53 173.82 173.53 174.13 0.60
1938 173.52 173.63 173.78 173.97 173.99 174.01 174.04 174.03 173.92 173.83 173.70 173.67 173.84 173.52 174.04 0.52
1939 173.64 173.64 173.76 173.92 174.04 174.06 174.05 174.00 173.89 173.78 173.71 173.66 173.85 173.64 174.06 0.42
1940 173.56 173.51 173.56 173.78 173.90 174.01 174.02 173.97 173.92 173.84 173.72 173.75 173.80 173.51 174.02 0.51
1941 173.84 173.72 173.66 173.74 173.78 173.83 173.82 173.75 173.66 173.57 173.52 173.51 173.70 173.51 173.84 0.33
1942 173.50 173.54 173.61 173.90 173.99 174.10 174.10 174.08 174.00 173.93 173.90 173.87 173.88 173.50 174.10 0.60
1943 173.97 173.90 173.96 174.11 174.38 174.57 174.57 174.49 174.36 174.24 174.16 174.07 174.23 173.90 174.57 0.67
1944 173.93 173.88 173.92 174.17 174.33 174.37 174.32 174.21 174.12 174.02 173.94 173.89 174.09 173.88 174.37 0.49
1945 173.84 173.76 173.96 174.17 174.28 174.43 174.46 174.39 174.29 174.32 174.22 174.14 174.19 173.76 174.46 0.70
1946 174.14 174.00 174.11 174.17 174.21 174.36 174.39 174.28 174.14 174.02 173.95 173.86 174.14 173.86 174.39 0.53
1947 173.84 173.84 173.81 174.18 174.48 174.66 174.58 174.50 174.42 174.26 174.15 174.10 174.24 173.81 174.66 0.85
1948 174.08 173.99 174.14 174.38 174.50 174.51 174.48 174.37 174.24 174.06 173.98 173.92 174.22 173.92 174.51 0.59
1949 173.96 174.02 174.06 174.12 174.15 174.15 174.12 174.03 173.91 173.82 173.68 173.66 173.97 173.66 174.15 0.49
1950 173.90 174.07 174.08 174.31 174.36 174.31 174.25 174.14 174.10 174.03 173.97 174.10 174.14 173.90 174.36 0.46
1951 174.10 174.11 174.32 174.48 174.54 174.54 174.50 174.42 174.30 174.20 174.17 174.21 174.32 174.10 174.54 0.44
1952 174.36 174.55 174.60 174.74 174.76 174.74 174.68 174.60 174.51 174.32 174.18 174.20 174.52 174.18 174.76 0.58
1953 174.24 174.25 174.31 174.38 174.47 174.56 174.53 174.48 174.35 174.22 174.12 174.06 174.33 174.06 174.56 0.50
1954 174.02 173.99 174.14 174.40 174.49 174.46 174.42 174.35 174.25 174.31 174.32 174.31 174.29 173.99 174.49 0.50
1955 174.38 174.30 174.47 174.57 174.57 174.53 174.46 174.40 174.27 174.17 174.06 174.00 174.35 174.00 174.57 0.57
1956 173.90 173.74 173.92 174.08 174.34 174.40 174.40 174.38 174.28 174.12 173.96 173.92 174.12 173.74 174.40 0.66
1957 173.87 173.85 173.91 174.12 174.22 174.24 174.31 174.19 174.08 173.95 173.84 173.86 174.04 173.84 174.31 0.47
1958 173.88 173.71 173.74 173.80 173.85 173.89 173.96 173.96 173.89 173.77 173.66 173.59 173.81 173.59 173.96 0.37
1959 173.56 173.68 173.79 173.96 174.09 174.08 174.00 173.92 173.82 173.79 173.72 173.79 173.85 173.56 174.09 0.53
1960 173.89 173.92 173.92 174.10 174.21 174.30 174.34 174.31 174.23 174.09 173.95 173.87 174.09 173.87 174.34 0.47
1961 173.81 173.80 174.01 174.18 174.40 174.38 174.32 174.29 174.21 174.03 173.92 173.86 174.10 173.80 174.40 0.60
1962 173.80 173.78 173.87 173.99 174.02 174.05 174.03 173.99 173.90 173.86 173.82 173.78 173.91 173.78 174.05 0.27
1963 173.69 173.60 173.69 173.87 173.93 173.92 173.85 173.80 173.72 173.62 173.55 173.48 173.73 173.48 173.93 0.45
1964 173.46 173.48 173.57 173.76 173.83 173.81 173.77 173.70 173.63 173.48 173.40 173.40 173.61 173.40 173.83 0.43
1965 173.46 173.51 173.67 173.80 173.88 173.89 173.83 173.78 173.75 173.67 173.64 173.67 173.71 173.46 173.89 0.43
1966 173.75 173.76 173.85 173.96 174.06 174.08 174.06 174.00 173.91 173.73 173.74 173.89 173.90 173.73 174.08 0.35
1967 173.88 173.88 173.91 174.08 174.20 174.20 174.22 174.18 174.09 174.02 173.99 174.06 174.06 173.88 174.22 0.34
1968 174.10 174.20 174.18 174.27 174.29 174.34 174.36 174.32 174.23 174.08 174.03 174.05 174.20 174.03 174.36 0.33
1969 174.09 174.23 174.21 174.38 174.55 174.62 174.69 174.63 174.48 174.32 174.24 174.24 174.39 174.09 174.69 0.60
1970 174.11 174.08 174.12 174.28 174.36 174.41 174.43 174.38 174.29 174.23 174.20 174.21 174.26 174.08 174.43 0.35
1971 174.18 174.15 174.31 174.39 174.44 174.48 174.44 174.38 174.36 174.28 174.16 174.17 174.31 174.15 174.48 0.33
1972 174.21 174.20 174.32 174.48 174.61 174.61 174.66 174.61 174.57 174.52 174.57 174.64 174.50 174.20 174.66 0.46
1973 174.66 174.67 174.78 174.92 174.91 174.98 174.93 174.84 174.69 174.57 174.46 174.48 174.74 174.46 174.98 0.52
1974 174.53 174.63 174.80 174.88 174.92 174.90 174.85 174.76 174.62 174.46 174.43 174.49 174.69 174.43 174.92 0.49
1975 174.51 174.55 174.68 174.70 174.71 174.75 174.71 174.65 174.67 174.56 174.46 174.44 174.62 174.44 174.75 0.31
1976 174.44 174.45 174.76 174.79 174.80 174.77 174.76 174.70 174.56 174.44 174.26 174.15 174.58 174.15 174.80 0.65
1977 174.06 173.99 174.17 174.38 174.50 174.43 174.43 174.40 174.38 174.32 174.23 174.28 174.30 173.99 174.50 0.51
1978 174.32 174.28 174.32 174.61 174.64 174.60 174.52 174.42 174.31 174.22 174.15 174.08 174.37 174.08 174.64 0.56
1979 174.08 174.04 174.19 174.45 174.55 174.58 174.58 174.55 174.52 174.44 174.34 174.38 174.39 174.04 174.58 0.54
1980 174.45 174.38 174.43 174.65 174.67 174.70 174.66 174.70 174.62 174.44 174.30 174.26 174.52 174.26 174.70 0.44
1981 174.13 174.14 174.29 174.36 174.49 174.57 174.60 174.54 174.50 174.44 174.39 174.33 174.39 174.13 174.60 0.47
1982 174.28 174.28 174.44 174.64 174.62 174.63 174.58 174.46 174.34 174.25 174.24 174.34 174.43 174.24 174.64 0.40
1983 174.38 174.36 174.39 174.52 174.68 174.70 174.70 174.68 174.54 174.42 174.40 174.48 174.52 174.36 174.70 0.34
1984 174.38 174.39 174.54 174.63 174.60 174.70 174.67 174.61 174.53 174.46 174.40 174.36 174.52 174.36 174.70 0.34
1985 174.45 174.48 174.79 174.98 174.92 174.89 174.83 174.73 174.66 174.55 174.70 174.76 174.73 174.45 174.98 0.53
1986 174.68 174.78 174.88 174.95 174.97 175.04 175.03 174.94 174.83 174.94 174.85 174.89 174.90 174.68 175.04 0.36
1987 174.86 174.78 174.74 174.83 174.80 174.77 174.78 174.68 174.60 174.44 174.36 174.37 174.67 174.36 174.86 0.50
1988 174.33 174.33 174.36 174.46 174.46 174.40 174.33 174.26 174.14 174.04 174.02 174.01 174.27 174.01 174.46 0.45
1989 174.06 174.07 174.09 174.25 174.32 174.52 174.51 174.39 174.30 174.15 174.06 173.99 174.23 173.99 174.52 0.53
1990 173.97 174.16 174.30 174.36 174.41 174.43 174.41 174.39 174.37 174.28 174.21 174.24 174.30 173.97 174.43 0.46
1991 174.42 174.36 174.42 174.48 174.53 174.54 174.44 174.34 174.24 174.09 174.02 174.04 174.34 174.02 174.54 0.52
1992 174.08 174.12 174.22 174.33 174.42 174.41 174.46 174.51 174.50 174.39 174.42 174.42 174.36 174.08 174.51 0.43
1993 174.58 174.53 174.54 174.69 174.67 174.66 174.64 174.53 174.41 174.29 174.24 174.28 174.51 174.24 174.69 0.45
1994 174.20 174.17 174.27 174.48 174.53 174.52 174.57 174.53 174.41 174.31 174.22 174.20 174.37 174.17 174.57 0.40
1995 174.23 174.26 174.28 174.37 174.42 174.45 174.43 174.40 174.24 174.15 174.09 174.07 174.28 174.07 174.45 0.38
1996 174.03 174.05 174.14 174.23 174.43 174.58 174.61 174.56 174.52 174.47 174.41 174.46 174.37 174.03 174.61 0.58
1997 174.47 174.53 174.79 174.83 174.84 175.01 174.96 174.83 174.74 174.61 174.49 174.48 174.72 174.47 175.01 0.54
1998 174.60 174.66 174.73 174.84 174.87 174.76 174.70 174.59 174.45 174.28 174.10 174.02 174.55 174.02 174.87 0.85
1999 173.99 174.10 174.18 174.26 174.28 174.27 174.22 174.14 174.04 173.96 173.90 173.86 174.10 173.86 174.28 0.42
2000 173.82 173.75 173.83 173.95 174.07 174.18 174.26 174.22 174.09 174.00 173.88 173.83 173.99 173.75 174.26 0.51
2001 173.75 173.84 173.94 174.02 174.04 174.09 174.03 173.94 173.83 173.80 173.80 173.86 173.91 173.75 174.09 0.34
2002 173.85 173.97 174.02 174.20 174.30 174.33 174.24 174.15 174.04 173.95 173.84 173.81 174.06 173.81 174.33 0.52
2003 173.81 173.73 173.78 173.97 174.08 174.17 174.18 174.17 174.04 173.92 173.85 173.89 173.97 173.73 174.18 0.45
2004 173.94 173.85 173.96 174.12 174.22 174.36 174.34 174.29 174.25 174.07 174.00 174.01 174.12 173.85 174.36 0.51
2005 174.23 174.26 174.29 174.38 174.40 174.32 174.22 174.14 174.08 174.00 173.88 173.84 174.17 173.84 174.40 0.56
2006 173.97 174.06 174.11 174.16 174.20 174.25 174.27 174.23 174.14 174.08 174.10 174.15 174.14 173.97 174.27 0.30
2007 174.29 174.22 174.26 174.32 174.35 174.26 174.15 174.13 174.08 173.94 173.80 173.86 174.14 173.80 174.35 0.55
2008 173.92 174.09 174.26 174.39 174.35 174.32 174.35 174.23 174.12 174.00 173.92 173.96 174.16 173.92 174.39 0.47
2009 174.04 174.07 174.31 174.42 174.46 174.45 174.42 174.35 174.24 174.13 174.07 174.02 174.25 174.02 174.46 0.44
2010 173.99 173.92 173.97 174.09 174.21 174.31 174.27 174.19 174.02 173.97 173.88 173.86 174.06 173.86 174.31 0.45
2011 173.83 173.75 174.03 174.20 174.46 174.58 174.48 174.38 174.30 174.27 174.21 174.40 174.24 173.75 174.58 0.83
2012 174.39 174.37 174.36 174.31 174.27 174.22 174.14 174.04 173.95 173.83 173.85 173.82 174.13 173.82 174.39 0.57
2013 173.82 173.86 173.92 174.02 174.10 174.23 174.35 174.28 174.16 174.07 173.97 173.94 174.06 173.82 174.35 0.53

All-Time

Average 173.99 173.99 174.07 174.22 174.30 174.33 174.31 174.25 174.16 174.06 173.99 173.98 174.14 173.87 174.36 0.49
Minimum 173.21 173.18 173.20 173.38 173.44 173.45 173.45 173.43 173.38 173.30 173.20 173.19 173.33 173.18 173.45 0.26
Maximum 174.86 174.78 174.88 174.98 174.97 175.04 175.03 174.94 174.83 174.94 174.85 174.89 174.90 174.68 175.04 0.85

2004-2013

Average 174.04 174.03 174.13 174.24 174.30 174.32 174.28 174.22 174.12 174.02 173.96 173.98

Lake Erie water levels in metres referred to Chart Datum

2013 0.32 0.36 0.42 0.52 0.60 0.73 0.85 0.78 0.66 0.57 0.47 0.44
All-Time
Average 0.49 0.49 0.57 0.72 0.80 0.83 0.81 0.75 0.66 0.56 0.49 0.48
Minimum -0.29 -0.32 -0.30 -0.12 -0.06 -0.05 -0.05 -0.07 -0.12 -0.20 -0.30 -0.31
Maximum 1.36 1.28 1.38 1.48 1.47 1.54 1.53 1.44 1.33 1.44 1.35 1.39

Lake Ontario monthly mean water levels in metres referred to IGLD 1985

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yearly
Average
Minimum
Monthly
Maximum
Monthly
Range
1918 74.74 74.72 74.92 75.10 75.09 75.06 74.99 74.87 74.78 74.74 74.74 74.72 74.87 74.72 75.10 0.38
1919 74.76 74.72 74.76 74.92 75.18 75.36 75.28 75.16 75.01 74.87 74.78 74.67 74.96 74.67 75.36 0.69
1920 74.54 74.44 74.46 74.60 74.64 74.62 74.66 74.64 74.59 74.53 74.51 74.58 74.57 74.44 74.66 0.22
1921 74.61 74.58 74.70 74.88 74.96 74.92 74.84 74.71 74.56 74.46 74.39 74.38 74.67 74.38 74.96 0.58
1922 74.36 74.34 74.47 74.76 74.92 74.96 75.02 74.90 74.75 74.61 74.47 74.32 74.66 74.32 75.02 0.70
1923 74.30 74.27 74.36 74.54 74.62 74.72 74.68 74.55 74.44 74.32 74.24 74.28 74.44 74.24 74.72 0.48
1924 74.34 74.40 74.39 74.55 74.76 74.82 74.79 74.75 74.62 74.56 74.41 74.30 74.56 74.30 74.82 0.52
1925 74.20 74.26 74.50 74.62 74.62 74.56 74.49 74.40 74.30 74.22 74.23 74.28 74.39 74.20 74.62 0.42
1926 74.20 74.15 74.16 74.41 74.55 74.55 74.49 74.44 74.41 74.41 74.50 74.56 74.40 74.15 74.56 0.41
1927 74.50 74.52 74.65 74.73 74.73 74.77 74.74 74.66 74.52 74.44 74.40 74.62 74.61 74.40 74.77 0.37
1928 74.74 74.73 74.72 74.87 74.93 74.93 74.97 74.94 74.79 74.67 74.64 74.68 74.80 74.64 74.97 0.33
1929 74.68 74.67 74.79 75.14 75.45 75.49 75.46 75.34 75.18 75.03 74.92 74.87 75.08 74.67 75.49 0.82
1930 74.98 75.08 75.24 75.36 75.38 75.39 75.37 75.19 75.00 74.82 74.64 74.52 75.08 74.52 75.39 0.87
1931 74.42 74.36 74.34 74.43 74.48 74.57 74.51 74.42 74.30 74.20 74.14 74.12 74.36 74.12 74.57 0.45
1932 74.26 74.46 74.51 74.69 74.79 74.76 74.70 74.61 74.44 74.32 74.26 74.23 74.50 74.23 74.79 0.56
1933 74.24 74.21 74.20 74.39 74.54 74.57 74.48 74.38 74.26 74.10 73.98 73.96 74.28 73.96 74.57 0.61
1934 74.04 74.05 74.06 74.24 74.29 74.22 74.14 74.00 73.91 73.82 73.75 73.74 74.02 73.74 74.29 0.55
1935 73.81 73.86 73.94 74.03 74.11 74.19 74.24 74.16 74.04 73.92 73.88 73.87 74.00 73.81 74.24 0.43
1936 73.84 73.78 73.98 74.45 74.53 74.48 74.38 74.23 74.16 74.08 74.06 74.00 74.16 73.78 74.53 0.75
1937 74.14 74.34 74.39 74.47 74.70 74.77 74.76 74.69 74.55 74.40 74.40 74.34 74.50 74.14 74.77 0.63
1938 74.28 74.38 74.54 74.70 74.74 74.72 74.66 74.64 74.52 74.46 74.36 74.27 74.52 74.27 74.74 0.47
1939 74.24 74.26 74.42 74.68 74.80 74.78 74.74 74.66 74.51 74.38 74.26 74.18 74.49 74.18 74.80 0.62
1940 74.12 74.08 74.08 74.37 74.62 74.73 74.75 74.66 74.54 74.42 74.36 74.38 74.43 74.08 74.75 0.67
1941 74.50 74.52 74.53 74.62 74.60 74.53 74.46 74.37 74.28 74.18 74.16 74.14 74.41 74.14 74.62 0.48
1942 74.14 74.14 74.30 74.58 74.70 74.79 74.74 74.69 74.60 74.52 74.50 74.50 74.52 74.14 74.79 0.65
1943 74.64 74.72 74.89 75.06 75.33 75.60 75.54 75.44 75.29 75.10 75.06 74.94 75.13 74.64 75.60 0.96
1944 74.80 74.72 74.72 74.88 75.06 75.12 75.11 75.00 74.88 74.73 74.59 74.54 74.85 74.54 75.12 0.58
1945 74.53 74.54 74.76 75.04 75.22 75.34 75.33 75.24 75.12 75.22 75.18 75.20 75.06 74.53 75.34 0.81
1946 75.16 75.10 75.20 75.16 75.11 75.13 75.10 74.98 74.84 74.76 74.72 74.66 74.99 74.66 75.20 0.54
1947 74.68 74.78 74.80 75.07 75.28 75.63 75.66 75.58 75.41 75.18 75.02 74.94 75.17 74.68 75.66 0.98
1948 74.86 74.84 75.02 75.32 75.42 75.46 75.38 75.24 75.05 74.88 74.78 74.72 75.08 74.72 75.46 0.74
1949 74.74 74.84 74.94 75.03 75.06 74.98 74.85 74.70 74.57 74.48 74.36 74.34 74.74 74.34 75.06 0.72
1950 74.52 74.68 74.78 75.10 75.17 75.15 75.09 74.99 74.88 74.78 74.74 74.82 74.89 74.52 75.17 0.65
1951 74.89 74.98 75.18 75.47 75.62 75.59 75.56 75.39 75.24 75.06 74.98 75.00 75.25 74.89 75.62 0.73
1952 75.10 75.27 75.37 75.62 75.72 75.76 75.64 75.48 75.32 75.15 74.98 74.98 75.37 74.98 75.76 0.78
1953 74.94 74.94 75.00 75.17 75.30 75.34 75.23 75.12 74.98 74.82 74.69 74.65 75.02 74.65 75.34 0.69
1954 74.62 74.68 74.89 75.09 75.32 75.30 75.18 75.02 74.92 74.90 74.92 74.94 74.98 74.62 75.32 0.70
1955 75.02 74.98 75.18 75.44 75.49 75.42 75.27 75.14 74.98 74.94 74.98 74.91 75.15 74.91 75.49 0.58
1956 74.78 74.69 74.76 74.95 75.23 75.30 75.20 75.06 74.99 74.82 74.68 74.60 74.92 74.60 75.30 0.70
1957 74.55 74.56 74.61 74.70 74.78 74.84 74.88 74.78 74.65 74.50 74.38 74.37 74.63 74.37 74.88 0.51
1958 74.42 74.38 74.45 74.55 74.60 74.59 74.54 74.46 74.39 74.32 74.25 74.19 74.43 74.19 74.60 0.41
1959 74.16 74.30 74.46 74.79 74.86 74.80 74.69 74.51 74.34 74.25 74.22 74.32 74.48 74.16 74.86 0.70
1960 74.45 74.56 74.59 74.87 75.11 75.14 75.00 74.80 74.61 74.50 74.49 74.43 74.71 74.43 75.14 0.71
1961 74.33 74.23 74.43 74.66 74.94 75.00 74.96 74.82 74.69 74.52 74.40 74.38 74.61 74.23 75.00 0.77
1962 74.33 74.27 74.32 74.62 74.85 74.93 74.88 74.85 74.74 74.69 74.62 74.60 74.64 74.27 74.93 0.66
1963 74.49 74.33 74.31 74.65 74.92 75.06 75.02 74.96 74.80 74.58 74.41 74.33 74.66 74.31 75.06 0.75
1964 74.18 74.02 74.02 74.27 74.54 74.67 74.68 74.57 74.43 74.20 74.00 73.86 74.29 73.86 74.68 0.82
1965 73.83 73.88 74.04 74.25 74.51 74.63 74.71 74.66 74.60 74.54 74.52 74.58 74.40 73.83 74.71 0.88
1966 74.56 74.53 74.66 74.74 74.79 74.91 74.90 74.82 74.72 74.58 74.50 74.57 74.69 74.50 74.91 0.41
1967 74.59 74.60 74.53 74.77 74.97 75.09 75.15 75.10 74.96 74.90 74.87 74.77 74.86 74.53 75.15 0.62
1968 74.67 74.69 74.70 74.90 74.90 75.02 75.08 74.98 74.86 74.66 74.53 74.60 74.80 74.53 75.08 0.55
1969 74.62 74.69 74.62 74.81 75.02 75.15 75.08 74.93 74.68 74.50 74.45 74.44 74.75 74.44 75.15 0.71
1970 74.42 74.44 74.46 74.69 74.89 74.94 74.99 74.90 74.74 74.64 74.56 74.56 74.69 74.42 74.99 0.57
1971 74.58 74.57 74.71 74.87 75.02 74.98 74.93 74.82 74.74 74.59 74.44 74.43 74.72 74.43 75.02 0.59
1972 74.54 74.63 74.73 74.95 75.21 75.26 75.34 75.25 75.02 74.78 74.71 74.80 74.94 74.54 75.34 0.80
1973 75.05 75.21 75.33 75.65 75.73 75.70 75.52 75.27 75.01 74.78 74.64 74.63 75.21 74.63 75.73 1.10
1974 74.83 75.02 75.10 75.29 75.50 75.59 75.50 75.25 74.96 74.68 74.53 74.54 75.07 74.53 75.59 1.06
1975 74.56 74.71 74.84 75.01 75.10 75.10 74.98 74.83 74.73 74.70 74.60 74.56 74.81 74.56 75.10 0.54
1976 74.62 74.71 75.07 75.37 75.54 75.54 75.42 75.22 75.00 74.83 74.67 74.54 75.04 74.54 75.54 1.00
1977 74.50 74.44 74.62 74.86 74.90 74.82 74.85 74.86 74.82 74.83 74.75 74.85 74.76 74.44 74.90 0.46
1978 75.08 75.12 74.98 75.22 75.32 75.23 75.04 74.89 74.73 74.58 74.44 74.42 74.92 74.42 75.32 0.90
1979 74.59 74.64 74.77 75.05 75.16 75.13 75.02 74.92 74.86 74.75 74.61 74.58 74.84 74.58 75.16 0.58
1980 74.60 74.61 74.60 74.99 75.14 75.13 75.12 75.06 74.88 74.66 74.55 74.54 74.82 74.54 75.14 0.60
1981 74.51 74.51 74.75 74.74 74.84 74.95 75.01 74.98 74.93 74.80 74.76 74.65 74.79 74.51 75.01 0.50
1982 74.59 74.60 74.62 74.91 75.00 75.07 75.03 74.85 74.71 74.58 74.53 74.54 74.75 74.53 75.07 0.54
1983 74.64 74.76 74.77 74.87 75.15 75.17 75.00 74.92 74.79 74.64 74.53 74.62 74.82 74.53 75.17 0.64
1984 74.73 74.76 74.90 75.12 75.30 75.32 75.21 75.02 74.82 74.63 74.52 74.49 74.90 74.49 75.32 0.83
1985 74.66 74.63 74.86 75.09 75.18 75.17 75.11 74.93 74.80 74.64 74.67 74.79 74.88 74.63 75.18 0.55
1986 74.90 74.98 75.06 75.29 75.29 75.34 75.33 75.25 75.11 75.16 75.04 75.02 75.15 74.90 75.34 0.44
1987 75.00 75.04 75.00 75.21 75.13 75.02 74.93 74.75 74.62 74.51 74.44 74.54 74.85 74.44 75.21 0.77
1988 74.53 74.59 74.59 74.75 74.88 74.92 74.86 74.80 74.68 74.56 74.54 74.46 74.68 74.46 74.92 0.46
1989 74.42 74.43 74.39 74.70 74.99 75.22 75.19 75.02 74.84 74.70 74.65 74.58 74.76 74.39 75.22 0.83
1990 74.54 74.62 74.77 74.98 75.11 75.14 75.01 74.87 74.70 74.64 74.62 74.65 74.80 74.54 75.14 0.60
1991 74.93 75.00 75.06 75.20 75.29 75.18 75.04 74.86 74.64 74.49 74.36 74.39 74.87 74.36 75.29 0.93
1992 74.44 74.45 74.56 74.84 75.11 75.05 75.00 75.03 74.98 74.85 74.82 74.86 74.83 74.44 75.11 0.67
1993 75.04 75.16 75.14 75.42 75.61 75.46 75.24 75.01 74.75 74.60 74.52 74.56 75.04 74.52 75.61 1.09
1994 74.55 74.52 74.55 74.87 75.10 75.08 75.02 74.93 74.78 74.62 74.54 74.50 74.76 74.50 75.10 0.60
1995 74.54 74.72 74.72 74.70 74.80 74.90 74.91 74.88 74.70 74.65 74.70 74.65 74.74 74.54 74.91 0.37
1996 74.62 74.75 74.77 74.82 75.13 75.23 75.15 74.99 74.83 74.74 74.72 74.73 74.87 74.62 75.23 0.61
1997 74.81 74.90 75.01 75.17 75.33 75.30 75.19 75.01 74.87 74.74 74.63 74.59 74.96 74.59 75.33 0.74
1998 74.82 75.06 75.15 75.42 75.35 75.18 75.14 74.93 74.73 74.51 74.34 74.29 74.91 74.29 75.42 1.13
1999 74.32 74.43 74.50 74.63 74.71 74.78 74.81 74.73 74.58 74.47 74.43 74.47 74.57 74.32 74.81 0.49
2000 74.50 74.45 74.58 74.82 75.10 75.26 75.24 75.06 74.81 74.61 74.46 74.47 74.78 74.45 75.26 0.81
2001 74.49 74.55 74.65 74.84 74.93 74.99 74.97 74.82 74.63 74.53 74.47 74.52 74.70 74.47 74.99 0.52
2002 74.56 74.68 74.79 74.98 75.22 75.33 75.19 74.91 74.65 74.49 74.36 74.32 74.79 74.32 75.33 1.01
2003 74.33 74.29 74.35 74.73 74.95 75.12 75.05 74.99 74.75 74.63 74.64 74.73 74.71 74.29 75.12 0.83
2004 74.83 74.75 74.72 74.89 75.04 75.14 75.09 75.02 74.95 74.70 74.50 74.55 74.85 74.50 75.14 0.64
2005 74.74 74.85 74.84 75.03 75.11 75.02 74.94 74.79 74.69 74.60 74.58 74.55 74.81 74.55 75.11 0.56
2006 74.63 74.86 74.82 74.83 74.84 74.89 74.98 74.95 74.81 74.74 74.79 74.83 74.83 74.63 74.98 0.35
2007 74.98 74.97 74.85 75.01 75.05 74.98 74.86 74.71 74.56 74.42 74.31 74.32 74.75 74.31 75.05 0.74
2008 74.56 74.75 74.87 75.18 75.30 75.19 75.12 75.06 74.81 74.60 74.51 74.55 74.88 74.51 75.30 0.79
2009 74.76 74.82 74.92 75.12 75.19 75.16 75.12 75.03 74.78 74.60 74.50 74.48 74.87 74.48 75.19 0.71
2010 74.51 74.54 74.55 74.66 74.71 74.85 74.97 74.90 74.72 74.61 74.50 74.52 74.67 74.50 74.97 0.47
2011 74.49 74.41 74.61 74.85 75.23 75.33 75.14 74.94 74.76 74.66 74.58 74.62 74.80 74.41 75.33 0.92
2012 74.80 74.99 74.97 74.92 74.91 74.90 74.79 74.65 74.50 74.34 74.29 74.28 74.70 74.28 74.99 0.71
2013 74.38 74.52 74.57 74.72 74.88 75.10 75.14 74.99 74.79 74.64 74.60 74.53 74.74 74.38 75.14 0.76

All-Time

Average 74.56 74.60 74.68 74.88 75.01 75.05 75.00 74.88 74.74 74.61 74.53 74.52 74.75 74.42 75.08 0.66
Minimum 73.81 73.78 73.94 74.03 74.11 74.19 74.14 74.00 73.91 73.82 73.75 73.74 74.00 73.74 74.24 0.22
Maximum 75.16 75.27 75.37 75.65 75.73 75.76 75.66 75.58 75.41 75.22 75.18 75.20 75.37 74.98 75.76 1.13

2004-2013

Average 74.67 74.75 74.77 74.92 75.03 75.06 75.02 74.90 74.74 74.59 74.52 74.52

Lake Ontario water levels in metres referred to Chart Datum

2013 0.18 0.32 0.37 0.52 0.68 0.90 0.94 0.79 0.59 0.44 0.40 0.33
All-Time
Average 0.36 0.40 0.48 0.68 0.81 0.85 0.80 0.68 0.53 0.41 0.33 0.32
Minimum -0.39 -0.42 -0.26 -0.17 -0.09 -0.01 -0.06 -0.20 -0.29 -0.38 -0.45 -0.46
Maximum 0.96 1.07 1.17 1.45 1.53 1.56 1.46 1.38 1.21 1.02 0.98 1.00

Montreal Harbour monthly mean water levels in metres referred to IGLD 1985

Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Yearly
Average
Minimum
Monthly
Maximum
Monthly
Range
1967 6.66 9.04 7.25 7.28 6.97 6.50 6.28 5.98 5.94 6.52 7.31 7.07 6.90 5.94 9.04 3.10
1968 8.96 7.73 7.44 7.48 6.42 6.10 6.33 6.26 6.35 6.19 6.27 6.52 6.84 6.10 8.96 2.86
1969 7.34 7.10 6.80 7.68 7.69 7.06 6.86 6.78 6.48 6.15 6.55 6.58 6.92 6.15 7.69 1.54
1970 6.86 6.72 6.53 7.21 7.32 6.64 6.58 6.54 6.29 6.44 6.53 6.94 6.72 6.29 7.32 1.03
1971 7.44 7.96 7.34 7.87 7.90 6.59 6.14 6.16 6.26 6.13 5.95 6.11 6.82 5.95 7.96 2.01
1972 6.42 6.71 7.15 7.73 8.32 7.39 7.46 7.27 7.02 7.03 7.28 7.24 7.25 6.42 8.32 1.90
1973 7.72 7.84 8.36 8.27 8.20 7.75 7.49 7.11 6.94 6.95 6.78 6.90 7.53 6.78 8.36 1.58
1974 6.98 7.01 7.64 8.21 8.93 8.12 7.41 7.03 6.74 6.67 6.78 6.92 7.37 6.67 8.93 2.26
1975 6.75 6.92 7.22 7.72 7.59 7.08 6.49 6.33 6.35 6.56 6.67 6.86 6.88 6.33 7.72 1.39
1976 8.19 8.10 8.26 8.82 8.18 7.42 7.36 7.06 6.79 6.85 6.66 6.47 7.51 6.47 8.82 2.35
1977 6.77 6.37 7.23 7.71 6.97 6.19 5.95 6.09 6.40 7.05 6.86 6.99 6.72 5.95 7.71 1.76
1978 7.43 7.73 7.27 8.02 7.70 6.87 6.48 6.32 6.21 6.22 5.97 5.87 6.84 5.87 8.02 2.15
1979 6.52 6.69 7.32 7.86 7.97 6.97 6.49 6.42 6.68 6.88 7.02 7.23 7.00 6.42 7.97 1.55
1980 6.74 6.57 6.65 7.41 7.15 6.50 6.56 6.72 6.81 6.94 6.87 6.73 6.80 6.50 7.41 0.91
1981 7.46 7.57 7.25 7.52 6.86 6.76 6.41 6.60 6.90 6.96 7.09 6.76 7.01 6.41 7.57 1.16
1982 6.52 6.73 6.68 7.47 7.08 6.51 6.40 6.21 6.20 6.14 6.37 6.76 6.59 6.14 7.47 1.33
1983 6.50 6.71 6.96 7.37 8.18 7.38 6.45 6.37 6.28 6.25 6.64 6.82 6.83 6.25 8.18 1.93
1984 6.53 6.92 7.12 7.94 7.39 7.19 6.96 6.80 6.64 6.22 6.33 6.50 6.88 6.22 7.94 1.72
1985 7.03 7.10 7.25 7.56 7.52 6.72 6.68 6.75 6.55 6.50 6.57 6.51 6.90 6.50 7.56 1.06
1986 6.61 6.99 7.11 7.85 7.51 7.17 7.02 7.12 7.08 7.16 7.09 7.06 7.15 6.61 7.85 1.24
1987 6.70 6.73 7.17 7.68 6.76 6.73 6.58 6.26 6.13 6.14 6.00 6.55 6.62 6.00 7.68 1.68
1988 6.33 6.58 6.28 7.19 6.55 5.93 5.72 5.94 5.93 6.27 7.01 6.39 6.34 5.72 7.19 1.47
1989 6.21 6.34 6.13 6.44 6.60 6.69 6.32 6.11 5.95 5.93 6.42 6.55 6.31 5.93 6.69 0.76
1990 6.71 6.79 6.95 7.34 7.08 6.66 6.42 6.19 6.01 6.49 6.57 6.79 6.67 6.01 7.34 1.33
1991 6.85 7.07 7.41 8.06 7.22 6.32 6.02 5.93 5.85 5.82 5.64 5.93 6.51 5.64 8.06 2.42
1992 6.18 6.43 6.28 6.91 7.01 6.21 6.11 6.27 6.49 6.60 7.03 6.85 6.53 6.11 7.03 0.92
1993 6.82 8.16 7.34 8.24 7.32 7.26 6.70 6.53 6.27 6.50 6.55 6.50 7.02 6.27 8.24 1.97
1994 6.58 6.96 6.67 7.28 7.12 6.88 6.81 6.48 6.18 6.02 6.19 6.20 6.61 6.02 7.28 1.26
1995 6.64 6.64 7.10 6.23 6.13 6.14 5.66 5.84 5.64 5.83 6.58 6.56 6.25 5.64 7.10 1.46
1996 6.70 6.95 6.71 7.07 7.76 6.82 6.89 6.63 6.32 6.40 6.80 7.01 6.84 6.32 7.76 1.44
1997 6.86 7.42 7.57 8.02 8.16 7.14 6.87 6.56 6.45 6.40 6.49 6.38 7.03 6.38 8.16 1.78
1998 6.78 6.87 7.56 8.21 7.05 6.75 6.84 6.40 6.21 5.94 5.55 5.60 6.65 5.55 8.21 2.66
1999 6.11 6.46 6.41 6.86 5.67 5.56 5.52 5.32 5.42 5.75 5.82 6.05 5.91 5.32 6.86 1.54
2000 6.26 6.19 6.27 6.71 6.66 6.33 6.52 6.32 6.08 5.68 5.50 5.74 6.19 5.50 6.71 1.21
2001 5.85 5.95 5.99 6.80 6.00 5.56 5.40 5.29 5.34 5.53 5.78 5.94 5.79 5.29 6.80
2002 5.81 6.05 6.25 7.16 7.17 7.23 6.55 6.05 5.56 5.40 5.42 5.31 6.16 5.31 7.23 1.92
2003 5.56 5.58 5.65 6.11 5.99 6.09 5.78 6.23 5.75 6.03 6.74 6.97 6.04 5.56 6.97 1.41
2004 6.71 6.71 6.65 7.05 6.94 6.41 6.36 6.29 6.43 6.05 5.77 6.19 6.46 5.77 7.05 1.28
2005 6.36 6.52 6.39 7.72 7.01 6.25 5.82 5.57 5.61 6.14 6.14 6.54 6.34 5.57 7.72 2.15
2006 6.50 6.72 6.87 7.38 6.57 5.88 5.91 6.04 5.85 6.67 7.29 7.11 6.57 5.85 7.38 1.53
2007 6.70 6.75 6.91 7.26 6.58 6.18 5.86 5.48 5.25 5.32 5.37 5.56 6.10 5.25 7.26 2.01
2008 6.40 6.61 6.73 7.89 7.42 6.77 6.72 6.84 6.14 5.83 6.09 6.36 6.65 5.83 7.89 2.06
2009 6.66 6.83 6.97 7.60 7.23 6.70 6.61 6.50 5.99 5.92 6.03 6.21 6.60 5.92 7.60 1.68
2010 6.12 6.29 6.44 6.16 5.40 5.34 5.46 5.60 5.68 6.41 6.18 6.64 5.98 5.34 6.64 1.30
2011 6.20 6.26 6.73 7.21 7.78 7.02 6.49 6.20 6.08 6.00 5.92 6.30 6.52 5.92 7.78 1.86
2012 6.21 6.54 7.24 6.65 6.20 5.67 5.29 5.21 5.23 5.48 5.50 5.62 5.90 5.21 7.24 2.03
2013 5.96 6.31 6.13 6.80 6.99 6.67 6.21 5.87 5.88 5.68 6.36 6.32 6.27 5.68 6.99 1.31

All-Time

Average 6.69 6.88 6.93 7.43 7.15 6.64 6.41 6.30 6.18 6.26 6.39 6.49 6.64 5.98 7.65 1.68
Minimum 5.56 5.58 5.65 6.11 5.40 5.34 5.29 5.21 5.23 5.32 5.37 5.31 5.79 5.21 6.64 0.76
Maximum 8.96 9.04 8.36 8.82 8.93 8.12 7.49 7.27 7.08 7.16 7.31 7.24 7.53 6.78 9.04 3.10

2004-2013

Average 6.38 6.55 6.71 7.17 6.81 6.29 6.07 5.96 5.81 5.95 6.07 6.29

Montreal Harbour water levels in metres referred to Chart Datum

2013 0.41 0.76 0.58 1.25 1.44 1.12 0.66 0.32 0.33 0.13 0.81 0.77
All-Time
Average 1.14 1.33 1.38 1.88 1.60 1.09 0.86 0.75 0.63 0.71 0.84 0.94
Minimum 0.01 0.03 0.10 0.56 -0.15 -0.21 -0.26 -0.34 -0.32 -0.23 -0.18 -0.24
Maximum 3.41 3.49 2.81 3.27 3.38 2.57 1.94 1.72 1.53 1.61 1.76 1.69