NOTICE: CDIAC as currently configured and hosted by ORNL will cease operations on September 30, 2017. Data will continue to be available through this portal until that time. Data transition plans are being developed with DOE to ensure preservation and availability beyond 2017.

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United States Historical Climatology Network

Select a state from the pulldown list and click "Map Sites" to show its stations on the map.

Click on a map station or select a station from the state station list to navigate to the daily and monthly data and documentation.

(Note: You can download monthly data for the whole U.S. and daily data for the whole U.S. or individual states by using the FTP links on the Data Access page.)

Note: A related product using a subset of the USHCN-Daily data is now available - DayRec: An Interface for Exploring United States Record-Maximum/Minimum Daily Temperatures
Select a state: