Download historical climate dataSource:
The Climate Data API provides access to historical temperature and precipitation data. These data are separate from the outputs of the GCMs, and they are based on gridded climatologies from the Climate Research Unit.
The ISO3 country code that you want data about. (http://unstats.un.org/unsd/methods/m49/m49alpha.htm) or the basin ID [1-468]. The historical period for country is 1901 - 2009, and 1960 - 2009 for basin
The climate variable you're interested in. "pr" for precipitation, "tas" for temperature in celcius.
The time scale you want to return values on. Must be "month", "year" or "decade"