Annual Heat Wave Index in the United States

This index defines a heat wave as a period lasting at least four days with an average temperature that would only be expected to occur once every 10 years, based on thehistorical record. The index value for a given year depends on how often heat waves occur and how widespread they are.

189520211920194019601980200000.20.40.60.811.2United States
1980
United States0.27
Annual Heat Wave Index in the United States

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