Historical Monthly Mean Water Levels from the Coordinated network for 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 Average Min Max 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
2014 175.95 175.95 175.95 176.06 176.27 176.38 176.46 176.48 176.51 176.54 176.54 176.53 176.30 175.95 176.54 0.59
2015 176.51 176.50 176.48 176.53 176.59 176.68 176.73 176.72 176.70 176.58 176.54 176.55 176.59 176.48 176.73 0.25
2016 176.57 176.56 176.61 176.77 176.82 176.84 176.84 176.82 176.78 176.69 176.59 176.51 176.70 176.51 176.84 0.33
2017 176.47 176.48 176.53 176.66 176.80 176.88 176.99 177.00 176.93 176.87 176.85 176.79 176.77 176.47 177.00 0.53
2018 176.73 176.74 176.76 176.79 176.92 176.98 176.98 176.95 176.94 176.90 176.86 176.83 176.87 176.73 176.98 0.25
2019 176.81 176.83 176.86 176.96 177.17 177.32 177.37 177.32 177.27 177.29 177.26 177.25 177.14 176.81 177.37 0.56
2020 177.26 177.25 177.22 177.30 177.38 177.45 177.46 177.42 177.34 177.25 177.20 177.14 177.31 177.14 177.46 0.32
2021 177.07 176.99 176.95 176.95 176.95 176.93 177.00 177.02 176.93 176.91 176.77 176.69 176.93 176.69 177.07 0.38
2022 176.60 176.54 176.53 176.66 176.75 176.80 176.81 176.79 176.71 176.60 176.55 176.46 176.65 176.46 176.81 0.35
2023 176.44 176.41 176.43 176.56 176.69 176.68 176.70 176.70 176.64 176.56 176.51 176.44 176.56 176.41 176.70 0.29
2024 176.42 176.40 176.39 176.46 176.58 176.66 176.73 176.68 176.57 176.42 176.33 176.23 176.49 176.23 176.73 0.50

All-time

Average 176.33 176.31 176.33 176.41 176.51 176.57 176.60 176.59 176.53 176.47 176.41 176.36 176.45 176.24 176.62 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 177.26 177.25 177.22 177.30 177.38 177.45 177.46 177.42 177.38 177.50 177.38 177.26 177.31 177.14 177.50 0.67

2015-2024

Average 176.69 176.67 176.68 176.76 176.87 176.92 176.96 176.94 176.88 176.81 176.75 176.69

Water levels in metres referred to Chart Datum

2024 0.42 0.40 0.39 0.46 0.58 0.66 0.73 0.68 0.57 0.42 0.33 0.23
All-Time
Average 0.33 0.31 0.33 0.41 0.51 0.57 0.60 0.59 0.53 0.47 0.41 0.36
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 1.26 1.25 1.22 1.30 1.38 1.45 1.46 1.42 1.38 1.50 1.38 1.26
Date modified: