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The U.S. National Climatic Data Center (NCDC) "is the world's largest active archive of weather data. NCDC produces numerous climate publications and responds to data requests from all over the world."
It is part of the National Oceanic and Atmospheric Administration (NOAA).

See their FAQs on Global Warming :
http://lwf.ncdc.noaa.gov/oa/climate/
globalwarming.html (Dec.1999)

NCDC Home page | About NCDC