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

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For temperature and precipitation, you can use the Worldclim dataset, but it does not include cloud cover.

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    If its useful, GeoTiffs of cloud fraction, cirrus reflectance and cloud optical thickness can be found here: neo.sci.gsfc.nasa.gov/about/ftp.php – Martin Apr 9 '15 at 8:56
  • I will check the site right away – Ama Apr 9 '15 at 9:35
  • I have visited the worldclim website but it seems may be i dont know how to arrange the data according to the number of years I want. I need the data from 1980 to 2012 but there is no space to add the year one needs do download. Can somebody direct me on how to download it from 1982 to 2012 in tif format – Ama Apr 10 '15 at 16:06

It depends on what, where and when in longtime terms you need.

Historical datasets:



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/

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