Climate Data

U.S. Climate Extremes Index (CEI)

The CEI was first presented in 1995 as a framework for quantifying observed changes in climate within the contiguous United States. The index is based on an aggregate set of conventional climate extreme indicators which now includes extremes in land- falling tropical storm and hurricane wind intensity. Originally, the CEI was calculated on an annual basis, and now the revised CEI is evaluated for eight standard seasons: spring, summer, autumn, winter, annual, cold season, warm season, and hurricane season. NOAA has also developed a regional CEI, providing data for 9 regions of the contiguous US.

Years of Record

1910/01 to 2012/12
temporal metadataID:



Monthly | Seasonal | Annual

Data Time Period Extended?

yes, data set is extended


Ocean or Land

Land Only

Input Data

monthly min/max temperature; daily precip; monthly PDSI; wind velocity of land-falling tropical storms and hurricanes

Earth system components and main variables

Data Access: Please Cite data sources, following the data providers' instructions.

Key Figures

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NOAA Climate Extremes Index Annual US Climate Extremes Index, plotted at

Cite this page

National Center for Atmospheric Research Staff (Eds). Last modified 30 Oct 2013. "The Climate Data Guide: U.S. Climate Extremes Index (CEI)." Retrieved from

Acknowledgement of any material taken from this page is appreciated. On behalf of experts who have contributed data, advice, and/or figures, please cite their work as well.