"Figure 1. Maximum Ice-Covered Area in the Great Lakes, 1973–2020",,,,,,
Source: EPA's Climate Change Indicators in the United States: www.epa.gov/climate-indicators,,,,,,
"Data source: NOAA, 2021",,,,,,
Web update: April 2021,,,,,,
Units: maximum percent ice cover,,,,,,
,,,,,,
Year,Erie,Huron,Michigan,Ontario,Superior,All Lakes
1973,95.7,66.7,33,62.6,69.8,60.6
1974,88.5,61.4,39.4,24.5,73.8,58.7
1975,80.1,55.1,28.1,14.9,64.9,50.2
1976,95.4,52.5,29.5,15.2,49.9,39.9
1977,99.8,95,93.1,46.7,96,89.9
1978,100,95.8,66.6,57.7,92.5,83
1979,100,96.4,92.3,86.2,97.1,94.7
1980,93.4,70.3,38.6,30.6,77.2,62.8
1981,96,93.8,53.8,47.6,84.7,71.3
1982,99.1,93.3,60.2,50.7,85.3,74.8
1983,40.8,31.8,23.6,12.5,20.2,22.1
1984,95.7,77.6,43.3,40.7,88.2,65.2
1985,96,87.4,41.3,38.2,81.9,69.8
1986,95.5,73.5,66.8,43.7,90.7,76.4
1987,88,43.5,20,8.4,14.5,27.3
1988,91.5,60.1,32.7,21.1,67.3,53.6
1989,91.6,76.3,30.9,15.5,82.3,59.2
1990,72.8,73.8,32.4,29.5,78.1,59.7
1991,35.1,43.8,21.5,11.6,89.6,44.3
1992,89.8,69.9,32.8,17.5,73.3,45.5
1993,94.3,78.3,32.2,29,77.2,64.4
1994,96.7,96.9,82.7,55.7,96.1,89
1995,94,41.7,21.6,18.8,28.8,32
1996,100,98.2,75,45.1,100,81.7
1997,99.6,65.3,37.8,25.6,89,58.4
1998,5.4,28.6,15.1,6.2,11.1,14
1999,74.8,36,23,17.9,18.3,26.6
2000,90.7,41.9,27.2,22.3,33.5,34.8
2001,94,45.7,29.5,17.9,46.7,34.4
2002,14.4,26.1,12.4,4,10.3,11.8
2003,95.7,96.2,48,49.6,95.5,80.2
2004,95.4,64.5,36.4,38.5,52.2,51.9
2005,93,58.9,29.4,37.8,54.5,44.2
2006,21.9,32.17,16.2,14.3,16.7,20.4
2007,95.8,71.39,37.2,23.8,51.8,55.2
2008,93.4,59.51,33.5,14,62.7,53.7
2009,95.6,85.11,52.3,25.9,93.6,73.9
2010,93.1,36.95,23.5,13.1,27.3,27.5
2011,95.9,63.79,29.4,31.1,33.6,40.1
2012,13.9,23.06,16.7,1.9,8.2,12.9
2013,83.7,47.75,24.4,15.6,38.6,38.4
2014,96.1,96.1,93.1,60.8,95.8,92.3
2015,98.1,96.4,72.9,82.4,95.7,88.8
2016,78.7,47.98,26.8,23.5,22.7,33.8
2017,35.5,35.35,18.2,5.8,18.7,19.4
2018,95.1,81.39,51.3,24.7,77.2,69
2019,94.3,95.7,55.8,39.8,94.9,80.9
2020,15.9,32.1,17.2,10.7,22.6,19.5