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Change in Summer Surface Water Temperatures of North American Lakes, 1985-2009

Published by U.S. Environmental Protection Agency, Office of Atmospheric Programs, Office of Air and Radiation | U.S. Environmental Protection Agency | Catalog Last Checked: August 03, 2026 at 04:43 AM | Dataset Last Updated: August 22, 2018 at 12:00 AM
This map shows the total change in the average July–September surface water temperatures in 34 North American lakes from 1985 to 2009, as measured by satellites. Red circles represent warming; blue circles represent cooling. Larger circles indicate larger changes. Circles with black borders represent lakes where the trend was statistically significant.

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