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Cooling Degree-Day Map of US

Colling Degree-Day map of US from the National Climatic Data Center website: http://lwf.ncdc.noaa.gov/oa/ncdc.html

More detailed maps are downloadable here on the NCDC site:

http://lwf.ncdc.noaa.gov/oa/documentlibrary/clim81supp3/clim81.html