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I have just discovered Iowa State University of Science and Technology's website, which offers free download of historical raw METAR data (also decoded) for many sites around the world:

http://mesonet.agron.iastate.edu/request/download.phtml

I have just discovered In addition to the above mentioned sources you can also use the following data source:

Iowa Environmental Mesonet (IEM): The IEM maintains an ever growing archive of automated airport weather observations from around the world. (ASOS Network / ASOS-AWOS-METAR Data)

Here is Iowa State University of Science and Technology's website, which offers free download of historical raw METAR weather data (also decoded) for many sites around the world:(decoded and METAR):

http://mesonet.agron.iastate.edu/request/download.phtml