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United States Historical Climatology Network (USHCN)
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USHCN is a high-quality, moderate-sized data set of monthly averaged maximum, minimum and mean temperature and total monthly precipitation developed to assist in the detection of regional climate change. The period of record varies for each station but generally includes the period 1900-1995. Included with the data set are metadata files that contain station history information about weather station moves, instrumentation, observing times, and elevation.

Resource URL: http://www.ncdc.noaa.gov/oa/climate/research/ushcn/ushcn.html