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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 water temperature expected to be abnormally cold this summer. North America's largest lake is still reverberating from one of the coldest winters in recent history, and it is likely to have its coldest summer in more than 35 years.