The U.S. Climate Extremes Index (CEI) is used to quantify observed changes in climate within the contiguous United States.
These figures are for all climate steps combined. It is the arithmetic average of the percentage of area with maximum or minimum temperatures well above or below average, the percentage of land in severe drought or severe moisture surplus, double the percentage of area with much greater than normal 1-day precipitation events, and the sum of the percentage of area with much greater number of days with or without precipitation.
The source does not provide the publication date. The date given is the date of access.
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Climate Extremes Index in the United States 2024, by region
In 2023, the eastern United States climate was, on average, the most abnormal across the North American country, with roughly ** to ** percent of the region having extreme climate conditions throughout the year. The Extreme Climate Index is an indicator of the percentage of land that experienced far from average conditions for a given time of the year, such as much warmer or colder daily maximum temperatures or much fewer days without rain.
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National Oceanic and Atmospheric Administration. (February 2, 2025). Climate Extremes Index in the United States in 2024, by region [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 15, 2026, from /statistics/1089609/us-climate-extreme-index/
National Oceanic and Atmospheric Administration. "Climate Extremes Index in the United States in 2024, by region." Chart. February 2, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 15, 2026. /statistics/1089609/us-climate-extreme-index/
National Oceanic and Atmospheric Administration. (2025). Climate Extremes Index in the United States in 2024, by region. ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 15, 2026. /statistics/1089609/us-climate-extreme-index/
National Oceanic and Atmospheric Administration. "Climate Extremes Index in The United States in 2024, by Region." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 2 Feb 2025, /statistics/1089609/us-climate-extreme-index/
National Oceanic and Atmospheric Administration, Climate Extremes Index in the United States in 2024, by region ÌÇÐÄÆƽâ°æ, /statistics/1089609/us-climate-extreme-index/ (last visited July 15, 2026)
Climate Extremes Index in the United States in 2024, by region [Graph], National Oceanic and Atmospheric Administration, February 2, 2025. [Online]. Available: /statistics/1089609/us-climate-extreme-index/
