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About This Map
Perceived temperature is the temperature at a given moment as perceived by a human being (not the actual air temperature). The perceived temperature map is a combination of two non-overlapping factors: heat index and wind chill. In hot weather, heat index, which is based on temperature and humidity, is used. In cold weather, wind chill, which is based on temperature and wind speed, is used. On our weather maps, perceived temperature, heat index, and wind chill are given in degrees Fahrenheit. Celsius maps for these variables are not available on this site since these variables are based on formulas only used in the United States.
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