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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 Huron is averaging 61.5 degrees as opposed to 58.2 degrees at this time last year. It also is 0.7 degrees warmer through its entire volume. Lake Erie is warmer than last year, but not by much. The average surface water temperature is 68.8 degrees compared to 68.4 degrees last year. The whole water volume is 0.2 degrees warmer this year. Lake Ontario is almost two degrees warmer than last year.