Is there any climatic portal for downloading historical climatic data ( Rainfall & Temperature) on a daily basis or at least on a decadal basis?
PRISM gives only for US regions.
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Look: https://www.wunderground.com/wundermap It's possible to scrap data or to use api free for limited requests
Historic climatic data from all over the world can be downloaded from https://www.ncdc.noaa.gov/cdo-web/ .