resourcE center

Title:

United States Historical Climatology Network (U.S. HCN)
Monthly Temperature and Precipitation Data

Source:

Carbon Dioxide Information Analysis Center
Oak Ridge National Laboratory

Description:

This database contains monthly temperature and precipitation data for 1221 stations in the contiguous United States. This network of stations, known as the United States Historical Climatology Network (U.S. HCN) and the resulting database were compiled by the National Climatic Data Center, Asheville, North Carolina. These data represent the best available data from the United States for analyzing long-term climate trends on a regional scale. The data for most stations extend through 12/31/94, and a majority of the station records are serially complete at least 80 years. Unlike many data sets that have been used in past climate studies, these data have been adjusted to remove bias introduced by station moves, instrument changes, time-of-observation differences, and urbanization effects.