Lake Superior Net Basin Supply (expressed as millimeters over lake surface),,,,,,,,,,,,,
Component Method using overlake precipitation depth  (precip + runoff - evaporation),,,,,,,,,,,,,
,,,,,,,,,,,,,Annual
Year,JAN,FEB,MAR,APR,MAY,JUN,JUL,AUG,SEP,OCT,NOV,DEC,Total
1950,-8.26,12.91,36.02,116.13,334.98,188.83,157.85,128.42,66.95,59.85,34.6,-12.05,1116.23
1951,1.32,68.66,94.27,176.96,174.44,189.32,105.25,147.27,134.48,86.8,18.82,4.35,1201.94
1952,19.84,22.17,60.94,141.18,114.67,171.5,200.9,130.38,29.39,-47.63,5.88,-21.48,827.74
1953,-10.51,14.9,62.51,110.89,217.97,201.11,174.62,136.12,43.32,9.85,7.99,-19.5,949.27
1954,-23.13,27.81,12.49,181.64,233.45,169.73,81.89,76.98,79.94,37.94,-6.38,-49.68,822.68
1955,-23.54,-2.3,68.01,139.39,134,98.46,126.3,108.35,59.12,85.67,7.6,-30.55,770.51
1956,-3.5,1.27,14.38,101.89,168.94,119.62,133.55,107.15,54.71,12.81,9.93,11.23,731.98
1957,-2.55,39.01,50.63,134.5,115.49,144.13,112.96,69.93,85.84,5.86,37.61,-18.38,775.03
1958,3.95,-7.1,30.06,72.67,80.4,126.25,144.32,111.94,77.07,26.69,42.43,-27.65,681.03
1959,-26.59,16.83,44.86,75.53,190.27,115.58,98.04,188.56,128.42,83.2,-16.21,-7.6,890.89
1960,9.52,9.98,20.84,201.01,233.88,121.93,113.16,90.09,51.14,26,24.65,-43.6,858.6
1961,-20.16,31.82,59.44,99.73,159.08,111.24,92.87,55.71,102.62,47.16,28.65,-18.16,750
1962,-23.89,42.11,32.19,84.03,179.95,94.56,85.68,120.13,68.96,6.01,-11.71,-36.19,641.83
1963,-16.56,24.12,61.57,115.18,109.91,170.35,84.18,101.57,41.13,21.26,-0.11,-48.91,663.69
1964,1.2,-2.37,20.34,150.91,231.33,154.93,107.91,112.33,92.83,40.05,21.14,-0.15,930.45
1965,-15.91,54.83,56.1,122.45,211.25,123.63,120.58,99.53,124.29,59.74,49.28,17.08,1022.85
1966,-4.15,38.76,96.03,117.18,146.81,127.11,104.52,149.13,21.66,54.94,-13.72,-15.77,822.5
1967,38.38,22.79,50.07,160.48,113.74,177.27,102.2,126.35,19.95,82.44,12.95,-11.2,895.42
1968,-23.69,-7.29,70.49,183.14,144.24,227.6,211.56,127.62,153.64,109.07,-5.46,26.23,1217.15
1969,57.91,9.44,4.55,176.22,152.06,132.45,101.97,91,29.68,58.56,-4.66,-28.36,780.82
1970,-6.64,-18.88,6.39,110.7,243.54,128.15,154.98,48.04,107.45,116.16,56.33,-0.72,945.5
1971,-3.17,35.45,42.82,138.42,220.2,167.66,107.18,62.92,70.53,113.3,48.35,6.82,1010.48
1972,-5.25,5.01,43.89,91.44,188.48,122.33,158.3,163.1,83.14,2.06,31.64,-14.14,870
1973,-13.82,-13.08,89.15,104.13,204.62,149.18,134.93,137.17,55.19,42.99,-5.07,-19.75,865.64
1974,-13.09,-5.94,1.03,133.85,177.07,184.6,131.99,130.97,59.41,53.9,55.78,-10.41,899.16
1975,40.25,22.36,29.49,100.15,169.73,178.93,93.66,62.69,55.9,18.98,70.36,-15.48,827.02
1976,5.21,29.39,97.12,175.75,98.44,135.14,83.16,29.08,-11.89,-18.56,-56.32,-42.79,523.73
1977,-13.81,19.42,122.65,127.72,99,123.14,133.13,148.65,206.33,71.48,47.35,-7.91,1077.15
1978,-33.15,0.16,27.91,89.57,164.15,135.99,168.06,145.89,85.39,8.03,8.39,-14.76,785.63
1979,-14.1,37.43,118.26,140.89,256.6,193.66,126.41,111.34,90.19,103.01,25,-12.1,1176.59
1980,43.91,8.52,24.29,108.47,102.58,114.39,103.11,119.64,127.4,22.71,-5.07,-63.61,706.34
1981,-25.09,45.38,42.3,143.71,112.22,192.68,78.54,82.57,13.52,52.68,-21.46,-11.01,706.04
1982,11.42,-3.18,30.38,116.63,185.55,79.44,172.72,100.28,81.92,139.99,53.19,27.85,996.19
1983,0.48,4.85,44.56,92.67,177.48,118.28,95.94,112.91,69.24,80.91,18.01,-28.17,787.16
1984,-9.26,19.6,11.7,125.31,130.99,180.89,105.65,104.46,65.8,53.28,-17.76,-0.68,769.98
1985,-18.63,16,44.27,125.68,174.37,118.43,122.54,109.7,128.31,101.31,63.47,-46.82,938.63
1986,-12.78,7.27,48.64,150.68,118.96,126.16,129.09,98.84,81.82,49.07,-15.82,-26.41,755.52
1987,-26.42,-9.17,11.88,51.32,108.18,62.85,119.5,77.77,47.57,-10.7,-16.64,-33.35,382.79
1988,-49.09,-36.13,22.29,79.97,112.82,73.5,64.07,186.88,59.33,32.72,92.48,-11.58,627.26
1989,23.03,-10.02,16.32,94.07,177.01,171.09,67.1,87.17,22.55,2.01,-39.1,-50.89,560.34
1990,-4.96,-21.12,39.37,88.86,127.15,166.79,114.11,70.92,93.1,91.79,0.38,-40.13,726.26
1991,-15.42,5.3,63.61,144.66,163.55,123,141.41,55.8,72.19,68.35,60.93,-11.3,872.08
1992,-5.91,6.94,6.42,103.73,178.09,103.35,150.5,98.14,132.03,52.66,30.06,7.05,863.06
1993,-10.13,-32.06,10.61,122.18,195.15,147.85,167.32,107.65,45.75,29.24,-7.12,-18.17,758.27
1994,-22.63,-2.02,38.13,116.59,134.92,119.97,110.87,116.98,84.17,27.66,3.41,-25.42,702.63
1995,-48.24,-29.96,34.59,64.13,145.72,60.09,147.89,94.76,66.33,127.42,-14.73,11.92,659.92
1996,14.96,25.16,18.73,138.57,247.47,199.25,179.71,130.42,80.1,68.15,28.37,13.77,1144.66
1997,27.76,-0.8,66.96,132.16,179.63,113.32,114.84,68.02,40.67,22.69,-3.84,-18.59,742.82
1998,-18.52,18.23,56.64,90.29,72.7,122.19,47.16,39.77,11.95,22.59,11.8,-37.72,437.08
1999,-14.85,10.49,6.27,141.5,203.22,139.22,196.07,90.99,78.12,55.16,-10.33,-55.35,840.51
2000,-48.24,-10.7,83.67,68.15,121.68,181.41,87.23,62.38,18.52,1.71,-10.04,-100.87,454.9
2001,-26.03,-20.69,-2.34,311.12,209.51,126,82.18,66.22,5.95,40.68,46.51,-5.99,833.12
2002,-56.05,-28.12,-1.98,161.79,150.32,130.03,102.84,86.35,94.35,58.65,-41.67,-87.93,568.58
2003,-69.01,2.35,49.46,125.48,182.06,75.94,130.43,83.53,89.87,35.32,16.34,-12.03,709.74
2004,-29.81,14.58,60.84,159.01,180.48,116.46,94.88,78.99,68.13,79.9,-12.51,-49.28,761.67
2005,-38.8,-0.51,-2.41,124.62,121.36,138.63,57.5,39.82,66.99,118.64,69.3,-1.5,693.64
2006,3.23,-29.02,44.63,142.15,174.47,64.88,81.86,15.65,12.2,-22.7,-21.41,-5.18,460.76
2007,-53.53,-58.5,59.57,83.62,83.86,107.24,84.82,29.07,126.55,185.68,-27.74,-17.54,603.1
2008,-8.45,-11.42,11.19,177.34,165.9,198.47,149.14,64.56,67.06,11.62,15.51,-32.58,808.34
2009,-21.62,20.49,50.77,137.21,139.25,115.48,112.26,149.34,46.23,59.32,36.91,-24.49,821.15
2010,-25.39,-21.23,40.09,41.29,67.61,124.07,84.52,77.07,89.73,21.42,16.13,-55.74,459.57
2011,-35.95,-29.88,8.65,141.41,160.77,143.85,99.22,39.33,26.04,10.24,2.52,-20.34,545.86
2012,-29.97,-12.83,100.11,86.65,146.27,173.36,89.14,10.47,-11.17,48.13,-9.12,-37.94,553.1
2013,-48.92,13.23,7.27,116.2,268.08,156.22,192.89,106.58,71.89,42.99,22.15,-35.05,913.53
2014,-26.04,6.03,20.09,214.95,283.12,173.69,117.76,107.72,92.9,71.98,13.19,42.05,1117.44
2015,-20.96,-9.25,45.62,116.91,190.22,143.58,105.33,98.57,74.17,28.19,73.93,73.58,919.9