I just want somebody to help me with a link so that I can download global climatic data variables like temperature, precipitation, cloud cover etc
closed as too broad by PolyGeo♦ Oct 26 '18 at 4:43
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For temperature and precipitation, you can use the Worldclim dataset, but it does not include cloud cover.
It depends on what, where and when in longtime terms you need.
In Europe since 2000 http://www.ogimet.com/index.phtml.en but you need a metar parser.
In Europe more close to climate models you can use http://apps.ecmwf.int/datasets/ from ERA-Interim program.
In Germany CDC Climate Data center sometimes hourly back to 1947 ftp://ftp-cdc.dwd.de/pub/CDC/