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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 82,000 sq km, 31,698 sq miles in size, is the largest fresh water lake in the world. It is about 350 miles (565 km) long and 160 miles (257 km) at its widest point. The deepest point is 1,332 ft, while the average depth is 500 ft. Shoreline: 2,730 miles (includes islands).