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Lake Superior surface-water temperatures averaged 1 or 2 degrees Fahrenheit below their long-term average at the end of May. According to the new forecast, surface temperatures over the deepest parts of the lakeâbetween 1,000 and 1,300 feetâwill be at least 6 degrees below normal by August and will still be in the 40s.
Lake Superior's surface water temperature in summer has warmed twice as much as the air above it since 1980. Per decade since 1980, surface water temperature in summer has increased about 2 Â°F (1 Â°C), while regional air temperature has increased 1 Â°F (0.5 Â°C). ,Lake Superior's ice cover is diminishing.The area covered by ice each winter is decreasing by about 0.5% per year. Ice cover in Lake Superior has decreased from 23% to 12% over the last century. Wind speeds over Lake Superior are increasing.ake Superior's ice cover is diminishing. The area covered by ice each winter is decreasing by about 0.5% per year. Ice cover in Lake Superior has decreased from 23% to 12% over the last century. Wind speeds over Lake Superior are increasing.