The National Aeronautics and Space Administration's Goddard Institute for Space Studies has two datasets of monthly and annual anomaly precipitation analyses available online. The data sets have a resolution of 2.5 deg x 2.5 deg. The first data set contains data from January 1900 to December 1988 obtained from the DOE. The second data set is an update of the first set and contains data from 1850 to 1995 obtained from NOAA baseline precipitation and NOAA NCEP station data. Data is a FORTRAN binary format and may be downloaded via the Web or an FTP client program.