Extreme weather events, such as heat waves, are likely to become more frequent and more intense within the next few years. In the United States, the frequency has increased steadily, from an average of two heat waves per year during the 1960s to about six per year during the 2010s.
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Environmental Protection Agency. (April 1, 2021). Average number of heat waves per year in the United States between 1961 and 2019, by decade [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 16, 2026, from /statistics/1293780/us-heat-wave-frequency/
Environmental Protection Agency. "Average number of heat waves per year in the United States between 1961 and 2019, by decade." Chart. April 1, 2021. ÌÇÐÄÆƽâ°æ. Accessed July 16, 2026. /statistics/1293780/us-heat-wave-frequency/
Environmental Protection Agency. (2021). Average number of heat waves per year in the United States between 1961 and 2019, by decade. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 16, 2026. /statistics/1293780/us-heat-wave-frequency/
Environmental Protection Agency. "Average Number of Heat Waves per Year in The United States between 1961 and 2019, by Decade." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 1 Apr 2021, /statistics/1293780/us-heat-wave-frequency/
Environmental Protection Agency, Average number of heat waves per year in the United States between 1961 and 2019, by decade ÌÇÐÄÆƽâ°æ, /statistics/1293780/us-heat-wave-frequency/ (last visited July 16, 2026)
Average number of heat waves per year in the United States between 1961 and 2019, by decade [Graph], Environmental Protection Agency, April 1, 2021. [Online]. Available: /statistics/1293780/us-heat-wave-frequency/
