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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 greatly ameliorates temperature extremes, slowing spring warming and the onset of winter. The coldest months average well below 0Â°C (32Â°F) and the warmer months about 22Â°C (70Â°F). The average date of the last freezing temperature in spring is June 8, and the average first fall freeze is September 23; however, freezing can occur during any month. The freeze-free period, or growing season, averages 107 days annually. The big lake's presence also increases precipitation at the lakeshore.