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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 1  ... is the largest freshwater lake in the world by surface area and the third largest by volume (Lake Baikal in Siberia and Lake Tanganyika in East Africa contain more water). 2  could hold all the water in the other Great Lakes, plus THREE MORE Lake Eries. 11,000 years ago: Glacial Lake Duluth, the precursor to Lake Superior, forms as the ice sheet retreats northeastward. 2  The lake's torrential outflow near present-day Duluth carves the St. Croix River Valley and feeds the Mississippi River.