In the United States, the average heat wave was 2.0°F above the local temperature threshold during the 1960s. During the 2010s, the average heat wave has increased to reach 2.5°F above the local threshold. A series of unusually hot days is referred to as an extreme heat event or a heat wave.
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Environmental Protection Agency. (April 1, 2021). Intensity of heat waves in the United States between 1961 and 2019, by decade (in Fahrenheit) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 16, 2026, from /statistics/1293833/us-heat-wave-intensity/
Environmental Protection Agency. "Intensity of heat waves in the United States between 1961 and 2019, by decade (in Fahrenheit)." Chart. April 1, 2021. ÌÇÐÄÆƽâ°æ. Accessed July 16, 2026. /statistics/1293833/us-heat-wave-intensity/
Environmental Protection Agency. (2021). Intensity of heat waves in the United States between 1961 and 2019, by decade (in Fahrenheit). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 16, 2026. /statistics/1293833/us-heat-wave-intensity/
Environmental Protection Agency. "Intensity of Heat Waves in The United States between 1961 and 2019, by Decade (in Fahrenheit)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 1 Apr 2021, /statistics/1293833/us-heat-wave-intensity/
Environmental Protection Agency, Intensity of heat waves in the United States between 1961 and 2019, by decade (in Fahrenheit) ÌÇÐÄÆƽâ°æ, /statistics/1293833/us-heat-wave-intensity/ (last visited July 16, 2026)
Intensity of heat waves in the United States between 1961 and 2019, by decade (in Fahrenheit) [Graph], Environmental Protection Agency, April 1, 2021. [Online]. Available: /statistics/1293833/us-heat-wave-intensity/
