See the Hadley Centre for more details. The air temperature page is from monthly station temperature time series. A version that is variance corrected (CRUTEM3V) is available. The technique for the variance adjusted dataset can be found at Jones et. al (2001). https://web.archive.org/web/*/https://esrl.noaa.gov/psd/data/gridded/data.crutem3.html
Jones (CRU) Air Temperature Anomalies Version 3: CRUTEM3
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OverviewNOAAairtemperature