US Historical Heat Records

Explore the most extreme temperature records and significant heatwaves that have impacted the United States throughout history.

The top 3

States with Highest Recorded Temperatures: California holds the record for the highest temperature ever recorded in the U.S. and globally, reaching 134°F (56.7°C) in Death Valley in July 1913. Other states with notable records include Arizona (128°F) and Nevada (125°F).
Hottest Years on Record for Contiguous US: 2024 was the warmest year on record for the contiguous U.S., with an average annual temperature of 55.5 degrees F, 3.5 degrees above the 20th-century average. Other exceptionally warm years include 2021 and 1936, which tie for America's hottest summer (June-August).
Three Most Impactful US Heatwaves: The 1936 heat wave, occurring during the Dust Bowl, caused over 5,000 deaths and set numerous state and city record high temperatures, many of which still stand. The 1988-1989 heat wave, coinciding with an intense drought, was responsible for as many as 10,000 deaths and significant agricultural damage. The 1901 heat wave primarily affected the East Coast, leading to nearly 9,500 fatalities.