Dataset averaged over a period of 37 years, based on Leemans, R. and Cramer, W., 1991. -The IIASA database for mean monthly values of temperature, precipitation and cloudiness on a global terrestrial grid. Research Report RR-91-18. November 1991. International Institute of Applied Systems Analyses, Laxenburg, pp. 61. Raster data-set has been exported as ASCII raster file type.
http://www.fao.org/WAICENT/FAOINFO/SUSTDEV/EIdirect/climate/EIsp0001.htm