Page last updated Oct 20, 2021 @ 10:08pm
Wind Maps
The US Department of Energy has assembled an atlas of wind data for the US and its territories that is an excellent source of information for siting wind turbines. All these maps show the wind class number. For a definition of these classes see the table at the bottom of this page. Click the following links for detailed map information.
In addition to the maps below there are updated higher resolution maps for each state at various heights at this web site -- click here for clickable USA maps.
Click the thumbnails below for an overview of the best regions in the USA for wind power:
American Samoa | Marshall Islands | Virgin Islands |
Caroline Islands | Midway Island | Wake Island |
Guam | Northern Marianas | |
Johnston Island | Puerto Rico |
Table 1-1 Classes of wind power density at 10 m and 50 m(a) Wind Power
Class*10 m (33 ft) 50 m (164 ft) Wind Power Density (W/m2) Speed(b) m/s (mph) Wind Power Density (W/m2) Speed(b) m/s (mph) 1 0 0 0 0 100 4.4 (9.8) 200 5.6 (12.5) 2 150 5.1 (11.5) 300 6.4 (14.3) 3 200 5.6 (12.5) 400 7.0 (15.7) 4 250 6.0 (13.4) 500 7.5 (16.8) 5 300 6.4 (14.3) 600 8.0 (17.9) 6 400 7.0 (15.7) 800 8.8 (19.7) 7 1000 9.4 (21.1) 2000 11.9 (26.6) (a) Vertical extrapolation of wind speed based on the 1/7 power law.
(b) Mean wind speed is based on Rayleigh speed distribution of equivalent mean wind power density. Wind speed is for standard sea-level conditions. To maintain the same power density, wind speed must increase 3%/1000 m (5%/5000 ft) elevation.
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