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Average Change in Drought (Five-Year SPEI) in the Contiguous 48 States, 1900–2020

Published by U.S. Environmental Protection Agency, Office of Air and Radiation | U.S. Environmental Protection Agency | Metadata Last Checked: January 27, 2026 | Last Modified: 2021-06-17T00:00:00.000+00:00
This map shows how drought conditions have changed across the contiguous 48 states from 1900 to 2020. The data are showed for small regions called climate divisions, as defined by the National Oceanic and Atmospheric Administration. Blue areas represent increased moisture; brown areas represent a decrease or drier conditions. For more information: https://www.epa.gov/climatechange/science/indicators.

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