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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's surface water temperature in summer has warmed twice as much as the air above it since 1980. Per decade since 1980, surface water temperature in summer has increased about 2 Â°F (1 Â°C), while regional air temperature has increased 1 Â°F (0.5 Â°C). ,Lake Superior's ice cover is diminishing.s shown on the graph below, over the last 100 years, Lake Superior has fluctuated about 2.5 feet (0.8 m). The high water level in October of 1985 was 3.9 feet (1.19 m) above a low in March of 1926. The data in this graph originated from the U.S. Army Corps of Engineers-Detroit District.