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Due to scheduled maintenance, many NCEI systems will be unavailable on Saturday, August 24 from 11:30 AM ET to 1:30 PM ET. We apologize for any inconvenience.

U.S. Historical Climatology Network (USHCN)

The U.S. Historical Climatology Network (USHCN) data are used to quantify national- and regional-scale temperature changes in the contiguous United States (CONUS). The USHCN is a designated subset of the NOAA Cooperative Observer Program (COOP) Network with sites selected according to their spatial coverage, record length, data completeness, and historical stability.