Data from rain gauge stations, satellites, and sounding observations have been merged to estimate monthly rainfall on a 2.5-degree global grid from 1979 to the present. The careful combination of satellite-based rainfall estimates provides the most complete analysis of rainfall available to date over the global oceans, and adds necessary spatial detail to the rainfall analyses over land. In addition to the combination of these data sets, estimates of the uncertainties in the rainfall analysis are provided as a part of the GPCP products. The August 2012 GPCP v2.2 uses upgraded emission and scattering algorithms, the GPCC precipitation gauge analysis, and inclusion of the DMSP F17 SSMIS. The December 2012 update contains "recomputed" October 2012 values.
NOAA ESRL: GPCP Version 2.2 Combined Precipitation Data Set (netCDF)
NASA Goddard: Global Precipitation Analysis (binary)
NASA: GPCP: Global analyses of monthly precipitation derived from satellite and surface measurements
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|Climatological annual mean precipitation (mm/day) for 1979-2010. The areal mean for the entire grid is 2.67 mm/day. (Climate Data Guide; D. Shea)|
|Top: Areal weighted mean of precipitation rate for 1979-2010. Bottom: zonal mean precipitation (mm/day). The thin horizontal line is the climatological long term mean. (Climate Data Guide; D. Shea)|
National Center for Atmospheric Research Staff (Eds). Last modified 03 Jan 2014. "The Climate Data Guide: GPCP (Monthly): Global Precipitation Climatology Project." Retrieved from https://climatedataguide.ucar.edu/climate-data/gpcp-monthly-global-precipitation-climatology-project.