Back to ListOttawa River at Grenville

Monthly and Annual Mean Water Levels in Metres From 1933 Annual Extremes
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Means Daily Maximum Daily Minimum
1933 39.91 39.66 39.55 41.51 41.58 40.35 39.62 39.45 39.15 39.00 39.11 39.13 39.83 42.28 38.86
1934 39.07 39.06 39.14 41.09 41.84 40.56 39.89 39.27 39.24 39.45 39.40 39.65 39.81 42.42 38.85
1935 39.49 39.38 39.76 40.46 40.39 39.89 39.95 39.53 39.34 39.31 39.53 39.42 39.71 40.93 39.18
1936 39.38 39.35 40.18 40.94 42.21 41.00 39.69 39.29 39.28 39.71 40.04 39.56 40.05 42.92 39.08
1937 40.05 39.92 40.03 40.76 41.33 40.12 39.49 39.38 39.27 39.53 40.35 39.98 40.02 41.82 39.08
1938 39.59 39.62 40.25 41.71 41.40 40.24 39.49 39.36 39.41 39.54 39.45 39.41 39.95 42.35 39.17
1939 39.38 39.39 39.42 40.31 41.60 40.71 40.08 39.89 39.43 39.50 39.66 39.45 39.90 41.96 39.19
1940 39.30 39.24 39.27 40.31 40.87 41.08 40.20 39.49 39.51 39.35 39.52 39.57 39.81 41.63 39.09
1941 39.57 39.52 39.53 40.89 40.48 39.65 39.56 39.46 39.51 39.97 40.50 40.13 39.90 42.12 39.22
1942 39.84 39.80 40.06 41.01 40.89 40.43 39.56 39.38 39.28 39.27 39.48 39.35 39.86 41.64 39.01
1943 39.43 39.50 39.75 40.62 42.08 41.15 40.02 39.53 39.62 39.49 39.66 39.53 40.03 42.97 39.23
1944 39.47 39.35 39.49 39.83 40.45 39.62 39.35 39.24 39.24 39.33 39.36 39.37 39.51 41.02 38.99
1945 39.34 39.26 40.01 40.81 40.71 40.66 39.56 39.24 39.32 39.57 39.67 39.49 39.80 41.87 39.10
1946 39.63 39.62 40.22 40.43 40.17 40.20 39.45 39.30 39.26 39.42 39.64 39.83 39.77 40.91 39.10
1947 39.75 39.79 39.78 41.41 42.67 42.46 40.57 39.69 39.47 39.48 39.44 39.43 40.33 43.13 39.20
1948 39.38 39.33 39.79 40.70 40.44 39.92 39.47 39.34 39.24 39.17 39.18 39.32 39.61 41.05 38.97
1949 39.42 39.49 39.70 41.25 40.76 39.98 39.90 39.31 39.31 39.33 39.33 39.51 39.77 41.67 39.05
1950 39.71 39.59 39.54 40.64 40.63 40.15 39.66 39.41 39.41 39.37 39.67 39.82 39.80 41.19 39.15
1951 39.78 39.75 40.17 42.32 40.93 39.83 39.93 39.49 39.52 39.95 40.70 40.38 40.23 43.18 39.26
1952 40.13 40.04 40.02 41.18 41.07 40.45 39.81 39.84 39.56 39.60 39.52 39.87 40.09 41.80 39.31
1953 39.86 39.94 40.42 41.31 40.29 39.62 39.41 39.26 39.16 39.25 39.23 39.29 39.75 41.86 38.99
1954 39.34 39.40 39.91 41.03 40.45 40.40 39.87 39.53 39.61 40.45 40.45 40.22 40.06 41.73 39.17
1955 40.08 39.89 39.98 41.51 40.26 39.61 39.33 39.11 39.12 39.32 40.05 39.80 39.84 42.20 38.89
1956 39.63 39.55 39.51 40.55 40.72 40.31 39.86 39.75 40.06 40.14 39.80 39.79 39.97 41.23 39.32
1957 39.77 39.77 39.92 40.04 40.02 39.73 40.62 39.56 39.67 39.89 40.27 40.32 39.97 41.31 39.13
1958 40.15 40.04 40.16 40.67 39.85 39.72 39.71 39.45 39.61 39.85 40.02 39.86 39.92 40.99 39.24
1959 39.75 39.69 39.59 40.69 40.44 39.71 39.35 39.26 39.46 39.60 40.14 40.18 39.82 41.22 39.06
1960 39.97 39.96 39.90 41.42 41.91 40.15 40.36 40.01 39.64 39.62 39.53 39.46 40.16 42.48 39.26
1961 39.44 39.32 39.39 39.90 40.02 39.65 39.60 39.49 39.49 39.52 39.40 39.58 39.57 40.23 39.11
1962 39.62 39.67 --- --- 40.37 39.66 39.13 39.12 39.23 39.39 39.74 40.03 39.62 40.82 38.94
1963 40.09 40.03 40.06 40.48 40.18 40.28 40.53 40.73 41.09 41.08 41.08 41.16 40.57 41.24 39.83
1964 41.19 41.18 41.21 41.28 41.27 41.20 41.07 41.09 41.12 41.14 41.14 41.13 41.17 41.55 40.86
1965 41.18 41.22 41.16 41.26 41.39 41.21 41.17 41.18 41.21 41.42 41.32 41.32 41.25 41.53 40.94
1966 41.27 41.25 41.39 41.33 41.24 41.25 41.13 41.17 41.13 41.16 41.22 41.60 41.26 41.99 41.01
1967 41.48 41.28 41.09 41.13 41.18 41.18 41.28 41.20 41.21 41.25 41.21 41.31 41.23 41.77 40.88
1968 41.26 41.22 41.15 41.05 41.22 41.20 41.22 41.17 41.16 41.16 41.16 41.18 41.18 41.41 40.77
1969 41.27 41.24 41.19 41.17 40.90 41.28 41.21 41.21 41.18 41.19 41.25 41.29 41.20 41.43 40.66
1970 41.24 41.24 41.21 41.06 40.96 41.11 41.18 41.20 41.17 41.19 41.20 41.21 41.16 41.36 40.61
1971 41.17 41.18 41.20 41.17 41.18 41.19 41.16 41.15 41.13 41.13 41.13 41.18 41.16 41.42 40.84
1972 41.19 41.15 41.18 41.13 41.43 41.36 41.34 41.28 41.25 41.25 41.34 41.35 41.27 41.67 40.95
1973 41.31 41.32 41.36 41.58 41.58 41.39 41.32 41.21 41.16 41.20 41.15 41.29 41.32 41.84 40.68
1974 41.22 41.21 41.35 41.53 42.12 41.64 41.17 41.15 41.20 41.34 41.38 41.41 41.39 42.67 40.66
1975 41.43 41.42 41.34 41.39 41.36 41.28 41.17 41.23 41.22 41.28 41.29 41.36 41.32 41.84 40.85
1976 41.19 41.41 41.21 41.67 41.41 41.30 41.28 41.29 41.34 41.32 41.25 41.41 41.34 42.70 40.67
1977 41.37 41.31 41.29 41.24 41.27 41.20 41.22 41.21 41.11 41.14 41.29 41.35 41.25 41.71 40.60
1978 41.34 41.31 41.18 41.26 41.24 41.24 41.18 41.15 41.14 41.18 41.11 41.14 41.21 41.53 40.84
1979 41.15 41.12 41.24 41.23 41.51 41.15 41.20 41.20 41.17 41.23 41.30 41.35 41.24 42.07 40.92
1980 41.32 41.24 41.37 41.33 41.20 41.19 41.19 41.18 41.15 41.21 41.00 41.32 41.23 41.78 40.59
1981 41.27 41.42 41.16 41.32 41.33 41.41 41.24 41.19 41.20 41.24 41.26 41.22 41.27 41.89 40.67
1982 41.18 41.20 41.23 41.28 41.20 41.20 41.17 41.16 41.16 41.17 41.20 41.38 41.21 41.64 41.00
1983 41.44 41.35 41.34 41.32 41.47 41.26 41.18 41.17 41.15 41.15 41.14 41.24 41.27 42.03 40.64
1984 41.21 41.28 41.25 41.38 41.27 41.35 41.26 41.20 41.18 41.17 41.22 41.31 41.26 41.59 40.95
1985 41.39 41.38 41.36 41.35 41.32 41.21 41.20 41.22 41.17 41.17 41.15 41.20 41.26 41.67 40.95
1986 41.18 41.15 41.18 41.31 41.37 41.28 41.20 41.17 41.22 41.24 41.22 41.23 41.23 41.66 40.90
1987 41.22 41.20 41.23 41.26 41.17 41.18 41.17 41.16 41.15 41.17 41.17 41.21 41.19 41.65 41.00
1988 41.24 41.27 41.19 41.26 41.28 41.19 41.17 41.20 41.20 41.33 41.42 41.35 41.26 41.57 40.97
1989 41.32 41.32 41.27 41.32 41.42 41.35 41.17 41.14 41.17 41.15 41.24 41.25 41.26 41.68 40.99
1990 41.31 41.31 41.34 41.53 41.31 41.22 41.16 41.17 41.16 41.25 41.28 41.42 41.29 42.91 40.62
1991 41.37 41.39 41.37 41.42 41.20 41.18 41.15 41.14 41.14 41.16 41.19 41.27 41.25 41.85 41.03
1992 41.28 41.28 41.27 41.37 41.27 41.18 41.18 41.17 41.21 41.25 41.38 41.34 41.26 41.51 41.04
1993 41.35 41.29 41.23 41.38 41.23 41.25 41.17 41.16 41.16 41.27 41.32 41.30 41.26 41.57 41.03
1994 41.27 41.33 41.30 41.18 41.36 41.30 41.30 41.24 41.17 41.16 41.22 41.23 41.25 41.56 40.81
1995 41.39 41.58 41.46 41.21 41.32 41.31 41.16 41.16 41.14 41.15 41.24 41.28 41.28 41.85 41.11
1996 41.34 41.38 41.32 41.30 41.27 41.28 41.23 41.20 41.17 41.18 41.21 41.24 41.26 41.59 41.00
1997 41.29 41.37 41.39 41.24 41.48 41.28 41.22 41.18 41.17 41.18 41.21 41.20 41.27 41.85 40.94
1998 41.23 41.25 41.31 41.45 41.21 41.18 41.18 41.15 41.14 41.15 41.15 41.20 41.21 42.06 41.04
1999 41.27 41.32 41.31 41.22 41.21 41.25 41.23 41.19 41.18 41.26 --- --- --- 41.49 40.86
2000 41.31 41.29 41.07 41.30 41.40 41.30 41.26 41.23 41.21 41.18 41.20 41.19 41.24 41.61 40.55
2001 41.23 41.27 41.24 41.20 41.28 41.24 41.19 41.18 41.18 41.28 41.37 41.40 41.25 41.48 40.91
2002 41.40 41.32 41.36 41.29 41.48 41.45 41.26 41.16 41.14 41.13 41.13 41.14 41.27 41.77 40.93
2003 41.13 41.12 41.19 41.31 41.24 41.22 41.17 41.21 41.16 41.24 41.45 41.64 41.26 41.94 41.03
2004 41.69 41.53 41.45 41.46 41.40 41.26 41.22 41.11 41.14 41.11 41.11 41.13 41.30 41.89 40.96
2005 41.22 41.17 41.10 41.41 41.28 41.21 41.16 41.14 41.10 41.19 41.17 --- 41.20 41.55 40.94
2006 41.44 41.52 41.43 41.36 41.44 41.34 41.25 41.20 41.18 41.29 41.40 41.41 41.36 41.82 41.17
2007 41.30 41.45 41.46 41.34 41.28 41.35 41.21 41.19 41.18 41.16 41.15 41.19 41.27 41.57 41.07
2008 41.33 41.41 41.43 41.71 41.43 41.39 41.38 41.34 41.23 41.21 41.24 41.33 41.37 41.95 41.07
2009 41.43 41.43 41.46 41.45 41.47 41.33 41.30 41.28 41.19 41.19 41.29 41.25 41.34 41.79 41.10
2010 41.28 41.28 41.33 41.24 41.20 41.19 41.16 41.16 41.22 41.28 41.29 41.52 41.26 41.76 40.93
2011 41.38 41.33 41.40 41.30 41.44 41.30 41.25 41.20 41.20 41.20 41.19 41.26 41.29 41.60 40.98
2012 41.30 41.33 41.39 41.32 41.25 41.21 41.17 41.16 41.17 41.21 41.27 41.28 41.25 41.56 41.04
2013 41.31 41.38 41.34 41.46 41.54 41.41 41.22 41.20 41.20 41.24 41.40 41.32 41.34 41.71 41.13
2014 41.36 41.35 41.22 41.43 41.51 41.32 41.23 41.22 41.26 41.33 41.30 41.31 41.32 41.67 41.09
2015 41.49 41.36 41.29 41.29 41.31 41.25 41.18 41.20 41.21 41.19 41.23 41.31 41.28 41.69 41.08
2016 41.65 41.80 41.67 41.53 41.40 41.28 41.20 41.19 --- --- --- --- --- 42.10 41.14
Mean 40.70 40.69 40.76 41.16 41.16 40.89 40.68 40.56 40.54 40.61 40.68 40.70 40.75 41.76 40.25
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Means Daily Maximum Daily Minimum