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Monthly and Annual Mean Water Levels in Metres From 1950 Annual Extremes
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Means Daily Maximum Daily Minimum
1950 177.39 177.33 176.91 177.41 179.37 179.32 179.29 179.20 178.65 177.95 177.70 177.87 178.20 179.57 176.69
1951 177.48 177.03 176.55 178.04 178.85 179.37 179.51 179.38 178.54 179.02 179.12 179.20 178.52 179.60 176.38
1952 178.45 177.96 177.18 177.27 179.07 179.45 179.23 179.30 179.45 178.94 178.46 179.03 178.65 179.55 176.35
1953 178.62 178.06 177.68 178.83 179.20 179.46 179.35 178.72 178.35 178.07 177.53 177.39 178.44 179.68 177.22
1954 176.97 176.74 176.69 177.03 179.08 179.42 179.27 179.06 178.65 179.33 179.41 179.13 178.41 179.74 176.20
1955 177.98 176.98 176.62 177.63 178.52 178.65 178.49 178.60 178.67 178.90 179.28 178.10 178.21 179.49 176.41
1956 176.85 176.52 176.51 176.80 178.68 179.41 179.37 179.25 179.12 179.38 178.61 178.05 178.22 179.67 176.37
1957 177.49 176.92 176.75 177.09 178.92 179.14 179.63 178.85 178.78 178.59 179.16 179.28 178.39 180.06 176.38
1958 179.34 178.34 177.09 176.83 177.73 178.77 178.73 178.47 178.55 178.77 179.28 177.83 178.31 179.51 176.54
1959 177.07 176.90 176.74 177.05 179.19 179.16 178.57 178.54 179.00 179.29 179.55 179.10 178.35 179.63 176.33
1960 178.62 177.58 176.87 177.45 180.14 179.61 179.62 179.32 178.72 178.73 178.40 178.27 178.62 181.04 176.72
1961 177.70 176.79 176.59 177.00 179.18 179.34 179.11 178.92 179.06 178.98 178.75 178.91 178.37 179.48 176.41
1962 178.13 177.29 176.62 177.02 179.15 178.80 178.52 178.65 178.60 178.41 178.32 178.19 178.15 179.40 176.51
1963 177.89 177.07 176.22 177.33 178.86 179.28 178.87 178.88 178.88 178.70 179.03 179.19 178.36 179.47 176.08
1964 178.32 177.36 176.63 177.38 179.36 179.43 179.04 178.74 178.58 178.76 178.83 178.62 178.42 179.62 176.29
1965 178.24 177.33 176.44 176.21 178.90 179.09 178.96 179.02 179.03 179.37 179.32 179.13 178.43 179.48 175.89
1966 178.08 177.29 176.81 177.39 178.98 179.38 179.24 179.19 178.75 179.08 179.30 179.72 178.61 180.25 176.62
1967 178.85 177.62 177.03 177.50 179.14 179.49 179.13 179.19 178.93 178.65 179.36 179.20 178.68 179.78 176.75
1968 178.69 177.29 176.48 177.87 178.79 179.06 178.99 179.24 179.06 178.81 178.58 178.46 178.45 179.39 176.12
1969 178.06 177.13 176.24 177.04 179.22 179.35 179.16 179.17 178.90 178.84 179.44 179.11 178.48 179.65 175.85
1970 178.40 177.30 176.35 176.11 178.94 179.46 179.50 179.18 178.77 179.00 178.79 178.63 178.38 179.61 175.65
1971 177.85 177.03 176.54 176.60 178.38 179.09 178.88 178.79 178.40 178.44 178.57 178.39 178.09 179.26 175.92
1972 177.63 177.11 176.39 176.02 178.72 179.28 179.29 179.00 179.11 178.78 179.05 178.81 178.27 179.47 175.57
1973 178.42 177.87 177.00 178.71 179.28 179.46 179.22 178.98 179.20 179.22 178.77 178.64 178.73 179.55 176.79
1974 177.88 177.20 176.57 176.48 179.33 179.39 179.27 178.97 178.77 179.24 179.41 178.99 178.47 179.67 175.91
1975 178.13 177.25 176.15 175.95 178.39 179.33 179.00 178.87 178.64 178.71 178.75 178.37 178.13 179.57 175.50
1976 177.49 176.23 176.03 177.83 179.24 179.27 179.21 178.87 178.83 178.88 178.60 178.12 178.22 179.48 175.83
1977 177.06 176.55 176.20 177.41 178.91 179.22 179.12 178.80 178.76 179.00 179.26 179.09 178.29 179.42 176.10
1978 178.34 177.21 175.97 175.61 177.82 179.36 179.14 178.76 178.80 179.25 178.90 178.90 178.18 179.49 175.39
1979 178.22 177.05 176.15 177.16 179.26 179.46 179.12 179.28 179.16 179.28 179.41 179.27 178.58 179.57 176.05
1980 178.40 177.09 176.12 177.20 179.22 179.21 179.36 179.16 179.00 179.14 179.19 178.75 178.49 179.43 175.86
1981 178.08 177.55 177.16 178.28 179.29 179.47 179.29 178.83 178.80 179.03 178.97 178.57 178.62 179.53 176.41
1982 178.45 177.75 175.97 175.93 178.56 179.34 179.23 178.84 178.69 179.15 179.32 179.32 178.39 179.45 175.43
1983 178.98 177.91 176.55 176.59 179.14 179.43 179.28 178.96 178.60 178.95 179.27 179.19 178.58 179.69 175.89
1984 178.41 177.11 176.09 176.85 178.83 179.44 179.39 179.31 179.03 178.92 179.31 179.36 178.51 179.55 175.81
1985 178.63 177.05 176.17 176.39 179.20 179.39 179.35 179.10 178.83 178.87 179.16 179.07 178.45 179.58 175.68
1986 178.33 176.79 175.75 176.81 178.91 179.28 179.20 179.13 179.07 179.21 179.00 178.24 178.32 179.39 175.55
1987 177.92 176.86 175.71 176.54 177.70 178.66 179.21 178.84 178.58 178.66 178.93 178.94 178.05 179.31 175.39
1988 178.54 176.85 175.60 177.61 179.11 179.32 179.06 179.03 179.15 179.31 179.28 179.16 178.51 179.46 175.45
1989 178.80 177.03 175.79 176.32 178.35 179.35 179.27 178.92 178.59 178.52 179.05 179.05 178.26 179.55 175.65
1990 178.17 176.51 176.00 176.33 178.84 179.36 179.33 179.27 179.02 179.39 179.27 179.30 178.41 179.59 175.66
1991 178.89 177.20 175.86 177.54 178.99 179.38 179.27 178.96 178.72 178.87 179.37 179.16 178.53 179.55 175.62
1992 178.26 176.63 175.71 175.71 178.53 179.37 179.12 178.82 179.09 179.03 179.29 179.13 178.23 179.51 175.18
1993 178.68 177.19 175.69 176.24 178.65 179.27 179.26 179.16 179.22 179.36 179.25 179.02 178.43 179.56 175.49
1994 178.88 177.67 176.07 176.02 178.57 179.27 179.33 179.08 178.99 179.04 179.10 179.00 178.43 179.46 175.42
1995 177.87 177.10 176.55 176.33 178.72 179.26 179.11 178.89 178.66 178.69 179.20 178.88 178.28 179.41 175.87
1996 177.67 177.10 176.28 176.12 178.92 179.37 179.37 179.17 179.04 179.09 178.95 178.83 178.33 179.48 175.46
1997 178.95 178.27 176.43 176.58 178.93 179.23 179.31 179.02 178.84 178.65 178.76 178.78 178.48 179.39 175.48
1998 178.43 177.28 175.88 178.54 178.98 179.31 179.14 178.82 178.68 178.68 178.59 179.08 178.46 179.37 175.52
1999 178.83 177.79 176.13 176.71 178.10 179.19 179.26 179.05 178.81 179.17 179.16 179.23 178.46 179.41 175.63
2000 178.84 177.43 176.49 177.43 178.85 179.33 179.29 179.21 178.90 178.65 178.98 178.96 178.53 179.44 176.26
2001 178.41 177.55 176.07 176.83 179.18 179.25 179.14 178.87 178.77 179.13 179.16 179.14 178.47 179.47 175.50
2002 178.37 177.02 176.26 177.24 179.09 179.34 179.22 179.07 178.75 178.63 178.69 178.94 178.40 179.53 175.87
2003 178.70 177.26 175.97 176.04 178.10 179.31 179.33 179.15 178.79 178.81 179.20 179.06 178.32 179.42 175.54
2004 178.41 177.04 176.00 176.89 179.01 179.25 179.32 179.08 178.98 178.72 178.75 178.68 178.35 179.53 175.77
2005 178.29 177.03 175.72 176.81 178.75 179.13 179.14 178.88 178.69 178.82 179.05 --- 178.27 179.27 175.48
2006 178.62 177.56 176.21 177.81 179.14 179.23 179.17 179.22 178.94 179.11 179.21 179.27 178.63 179.42 175.85
2007 178.68 177.62 176.18 176.85 178.87 179.29 179.22 178.98 178.78 178.67 178.86 178.68 178.40 179.46 175.77
2008 178.57 178.09 176.16 176.86 179.14 179.27 179.16 179.20 179.12 179.01 179.07 178.95 178.55 179.48 175.54
2009 178.75 177.31 176.12 177.04 179.12 179.09 179.24 179.23 179.00 178.90 178.94 179.01 178.49 179.38 175.83
2010 178.57 177.10 175.98 177.32 178.75 178.97 178.94 178.79 178.97 179.05 179.12 179.13 178.40 179.42 175.87
2011 178.63 177.19 176.03 176.49 179.02 179.15 179.27 179.26 178.91 178.88 179.04 179.14 178.43 179.42 175.72
2012 178.66 176.74 176.94 178.89 179.20 179.22 178.99 178.92 178.82 178.90 179.08 178.79 178.60 179.34 175.88
2013 178.23 177.16 176.08 176.55 179.28 179.19 179.08 179.20 178.90 179.11 179.23 178.83 178.41 179.50 175.87
2014 178.55 177.34 175.86 176.05 178.98 179.20 179.24 179.17 179.06 179.11 178.86 178.88 178.37 179.49 175.54
2015 178.86 177.70 176.15 176.66 179.14 179.18 179.15 179.06 178.83 178.71 179.09 179.06 178.47 179.37 175.57
2016 178.65 178.33 177.05 177.02 --- --- --- --- --- --- --- --- --- 179.05 176.52
Mean 178.22 177.23 176.35 176.98 178.88 179.28 179.19 179.00 178.84 178.91 178.99 178.84 178.40 179.56 175.96
Year Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Annual Means Daily Maximum Daily Minimum