By Paul Homewood
The Global Historical Climatology Network (GHCN) is a database of temperature, precipitation and pressure records.
The aggregate data are collected from many continuously reporting fixed stations at the Earth’s surface and represent the input of approximately 6000 temperature stations, 7500 precipitation stations and 2000 pressure stations.
Temperature data from GHCN is used by the three major global temperature datasets, NCDC, GISS and HADCRUT, but who actually runs the network?
It is actually managed by the National Climatic Data Center, NCDC, which is in turn a division of NOAA. NOAA, of course, is part of the United States Department of Commerce.
As an added complication, the USHCN, the United States Historical Climatology Network, is run jointly by NCDC and CDIAC, the Carbon Dioxide Information and Analysis Center. CDIAC is run by the Department of Energy.
When we talk about the various temperature adjustments that have…
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