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Summary
DescriptionAverage Drought Conditions in the Contiguous 48 States, 1895-2011.png
English: This graph shows average drought conditions in the contiguous 48 states, according to the EPA, with yearly data going from 1895 to 2011. As stated by the agency, a value between -2 and -3 indicates moderate drought, -3 to -4 is severe drought, and -4 or below indicates extreme drought. The curve is a nine-year weighted average.
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Source
This image was posted by the U.S. Environmental Protection Agency here.