The U.S. Energy Information Administration provides monthly and annual production data for over 1,900 power plants including wind-powered facilities. Windaction.org filtered the data for the years 2011-2013 looking for wind projects only and determined the capacity factors for each project in EIA's sample list with at least one full-year of production. The below map shows the average capacity factors by state for 2013. (Click the map to see a larger image.)
A full breakdown of the production data by state and individual project in each of the years 2011, 2012 and 2013 can be found here.