Environment Counts | Near record ice cover for the Great Lakes :
According to the National Ocean and Atmospheric Administration (NOAA) as of March 6, 92.2 % of the five Great Lakes were under ice. The record is 94.7 % set in 1979. The area under ice this winter covered about 86,000 square miles. The 40-year average ice coverage for all the lakes is about 51 %.
Four of the Great Lakes are more than 90 percent under ice. Lake Ontario has only 59 percent ice coverage because of its depth and smaller surface. Great Lakes Environmental Research Center