Micro wind turbines are ideal for on-site energy generation and can be installed effectively in most locations. While these micro wind turbine will produce power in as little as at 2.5 MPH winds, choosing a site with at least 9-10 mph average wind is advised to make installing it really worthwhile.
Below is a map showing the wind in the USA. Consult local records for more advanced information. The actual wind speed at your site will also be influenced by the local topography and any nearby obstructions such as trees or buildings.