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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.
Continued wet weather contributed to Lake Superior finishing the quarter 15 cm (5.9 in) above its long-term average and 20 cm (7.9 in) above last yearâs level. Lake Michigan-Huron continued to rise, finishing the quarter just 2 cm (0.8 in) below average, but 42 cm (16.5 in) higher than last yearâs level.