Annual Precipitation
This map shows the average amount of precipitation falling in a year, based on approximately 50 years of data. The figures shown do not therefore represent the amount of precipitation that may occur in any given year.
The WORLDCLIM dataset consists of interpolated climate surface data on monthly precipitation and mean, minimum, and maximum temperature at a spatial resolution of 30 arc seconds (approximately 1km spatial resolution). Input data were gathered from a variety of sources and, where possible, restricted to records between 1950 and 2000.
The data are described in: Hijmans, R.J., S.E. Cameron, J.L. Parra, P.G. Jones and A. Jarvis, 2005. Very high resolution interpolated climate surfaces for global land areas. International Journal of Climatology 25: 1965-1978 which can be downloaded at http://www.worldclim.org/