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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 Michigan is more than three degrees warmer on the surface than last year. Currently, Lake Michigan is 61.0 degrees versus 57.7 degrees last year. The entire lake volume is 0.7 degrees warmer than last year. Lake Huron is averaging 61.5 degrees as opposed to 58.2 degrees at this time last year.