The map … shows water surface temperature anomalies for July 9, 2020; that is, how much the surface layer of each lake was above or below the long-term average temperature for this time of year. The data come from the Multiscale Ultrahigh Resolution Sea Surface Temperature (MUR SST) project, based at NASA’s Jet Propulsion Laboratory. MUR SST blends measurements of sea surface temperatures from multiple NASA, NOAA, and international satellites, as well as ship and buoy observations. According to the map above and NOAA reports, surface temperatures are 6° to 10° Fahrenheit (3° to 5° Celsius) above normal for early July. The average lake water temperature across all of Lake Erie—the shallowest lake—was 74.29°F on July 15; it was 59.83°F across Lake Superior, the largest lake…”
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Hans Howe 