The Global Historical Climatology Network (GHCN) is a database of temperature, precipitation and pressure records managed by the National Climatic Data Center, Arizona State University and the Carbon Dioxide Information Analysis Center.The aggregate data are collected from many continuously reporting fixed stations at the Earth's surface and represent the input of approximately:6000 temperature stations7500 precipitation stations2000 pressure stationsThis work is often used as a foundation for reconstructing past global temperatures, such as NASA's GISTEMP. The average temperature record is 60 years long with ~1650 records greater than 100 years and ~220 greater than 150 years (based on GHCN v2 in 2006). The earliest data included in the database was collected in 1697.
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