Monthly mean water levels

Monthly mean water level in metres referred to chart datum.

Lakes   Superior Huron St.Clair Erie Ontario
2009 January -0.06 0.01 0.55 0.55 0.56
  February -0.10 0.01 0.55 0.57 0.62
  March -0.12 0.09 0.66 0.82 0.72
  April -0.07 0.20 0.74 0.92 0.92
  May 0.05 0.34 0.80 0.96 0.99
  June 0.10 0.41 0.85 0.95 0.96
  July 0.14 0.44 0.84 0.92 0.92
  August 0.19 0.44 0.80 0.85 0.83
  September 0.21 0.37 0.73 0.74 0.58
  October 0.16 0.29 0.59 0.63 0.40
  November 0.15 0.27 0.53 0.57 0.30
  December 0.10 0.22 0.47 0.52 0.28
2010 January 0.01 0.15 0.34 0.49 0.31
  February -0.06 0.11 0.04 0.42 0.34
  March -0.11 0.09 0.36 0.47 0.35
  April -0.12 0.11 0.49 0.59 0.46
  May -0.12 0.13 0.58 0.71 0.51
  June -0.07 0.20 0.67 0.82 0.65
  July -0.01 0.26 0.68 0.77 0.77
  August 0.0 0.24 0.65 0.69 0.70
  September 0.02 0.16 0.52 0.52 0.52
  October -0.01 0.07 0.45 0.47 0.41
  November -0.06 -0.04 0.32 0.38 0.30
  December -0.13 -0.14 0.31 0.36 0.32
2011 January -0.08 -0.19 0.08 0.33 0.29
  February -0.27 -0.22 0.10 0.25 0.21
  March -0.33 -0.19 0.27 0.53 0.41
  April -0.29 -0.09 0.49 0.70 0.65
  May -0.16 0.1 0.75 0.96 1.03
  June -0.05 0.21 0.82 1.08 1.13
  July 0.05 0.26 0.81 0.98 0.94
  August 0.08 0.24 0.76 0.88 0.74
  September 0.03 0.13 0.24 0.80 0.56
  October 0.01 0.08 0.62 0.77 0.46
  November -0.04 0.07 0.55 0.71 0.38
  December -0.11 0.04 0.08 0.90 0.42
2012 January -0.19 -0.01 0.62 0.88 0.60
  February -0.26 -0.04 0.59 0.87 0.79
  March -0.27 0.00 0.55 0.86 0.77
  April -0.2 0.03 0.59 0.81 0.72
  May -0.14 0.05 0.58 0.77 0.71
  June 0.00 0.07 0.58 0.72 0.70
  July 0.10 0.04 0.54 0.64 0.59
  August 0.07 -0.03 0.45 0.54 -0.34
  September 0.00 -0.14 0.35 0.45 0.30
  October -0.07 -0.26 0.21 0.33 0.14
  November -0.09 -0.33 0.19 0.35 0.09
  December -0.14 -0.39 0.14 0.32 0.08
2013 January -0.21 -0.43 0.12 0.32 0.18
  February -0.24 -0.39 0.14 0.36 0.32
  March -0.29 -0.37 0.24 0.42 0.38
  April -0.28 -0.25 0.36 0.52 0.52
  May -0.09 -0.07 0.44 0.60 0.68
  June 0.06 0.05 0.59 0.73 0.90
  July 0.17 0.09 0.85 0.94 0.66
  August 0.24 0.08 0.62 0.78 0.79
  September 0.28 0.04 0.56 0.66 0.59
  October 0.25 0.01 0.45 0.57 0.42
  November 0.20 -0.01 0.39 0.47 0.40
  December 0.15 -0.03 0.39 0.44 0.33
2014 January 0.09 -0.04 0.29 0.50 0.44

Elevation of chart datum in metres referred to International Great Lakes Datum 1985.

Lake   Superior Huron St.Clair Erie Ontario
Chart Datum IGLD 1985 183.2 176.0 174.4 173.5 74.2
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