USHCNUnited States Historical Climatology Network
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Other studies have suggested problems with the USHCN data set.
The USHCN data set (National Climatic Data Center, 2008) consists of daily and monthly temperature and precipitation records from approximately 1200 weather stations within the contiguous United States.
Monthly station data from 1895 to the present for approximately 1,200 long-term USHCN stations are exclusively used in the time series tool.