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The monthly mean rainfall estimates over the whole globe are based on climatology (data from 1931 to 1960 over the continents, and 1955 to 1965 over the oceans) and a gridding technique (See Jaeger (1983) for a general description of the method.). The data file consists of 2.5 degree latitude by 5 degree longitude gridded monthly means of estimated rainfall. For the continental regions, the grid cell values were derived from visual estimates of isopleth maps prepared from up-to-date climatic atlases containing annual and monthly rainfall values, supplemented by other data sets. Over the oceans, rainfall values were estimated using Moller's method. Monthly percentage frequencies were derived using the U.S. Marine Climatic Atlas (U.S. Naval Weather Service, 1955-1965) for isoline data and their interpolated values at the grid points. These monthly frequencies were converted to annual percentages, which were then scaled to rainfall depth units, using Geiger's (1965) precipitation map, to generate monthly precipitation means.
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