How Temperatures Extremes Are Determined Across The United States

Extremes of high and low temperatures are compiled by the Hydrometeorological Prediction Center (HPC), which is a branch of the National Weather Service. The national high and low are determined from information provided by local National Weather Service offices across the country. The guidelines for the temperatures involve 1) the elevation must not be above 8,500 feet and 2) the location must have a population of more than 1,000 except for noteworthy or unusual locations.

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