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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.
Last yearâs frigid winter led to some very cold surface waters on Lake Superior during the summer of 2014, but will the same be true for 2015?he early outlook for the 2015 recreation season appears to again be colder than average, but not as extreme as 2014. On March 17, NOAAâs Great Lakes Coastal Forecasting System showed an average ice thickness of around 25 cm on Lake Superior, with 71% of the lake covered in ice (Figure 3).