Temperature Anomalies
Global temperature anomaly data come from NOAA's Global Surface Temperature Analysis (NOAAGlobalTemp), which uses comprehensive data collections of increased global coverage over land (Global Historical Climatology Network-Monthly) and ocean (Extended Reconstructed Sea Surface Temperature) surfaces. These datasets have data from 1850 to the present. The land and ocean datasets are blended into a single product to produce the combined global land and ocean temperature anomalies. The global and hemispheric temperature anomalies are calculated with respect to the 1901-2000 average, the gridded temperature anomalies with respect to the 1991-2020 base period, while all other regional anomalies are based on the 1910-2000 period. For more information on these anomalies, please visit Global Surface Temperature Anomalies.
Precipitation
Precipitation data are provided by the The Global Precipitation Climatology Project (GPCP) Monthly Precipitation Climate Data Record (CDR) with data beginning in 1979. Anomalies are calculated with respect to the 1991-2020 base period.
Global Regions
NOAA's National Centers for Environmental Information
