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http://apps2.eere.energy.gov/wind/windexchange/wind_maps.asp http://apps2.eere.energy.gov/wind/windexchange/wind_maps.asp has this map plus state by state maps

by scblock 10y ago

http://apps2.eere.energy.gov/wind/windexchange/wind_maps.asp http://apps2.eere.energy.gov/wind/windexchange/wind_maps.asp has this map plus state by state maps available for download as relatively high resolution PDFs.