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. 

• Climate Data Online (CDO)
  For users who know the station(s) for which they want data
• U.S. Historical Climatology Network (USHCN)
  Learn more about the USHCN and how to access the data.