The recent post [on nuclear targets] that mentioned the prevailing winds reminded me that Weather Underground posts graphs of historical weather data, including wind direction. Because the chart is for the calendar year, the seasonality of the wind in a different region can be determined. For instance, compare the hot south summer winds in Dallas, with the summer ocean winds in Los Angeles, and the northwest fury in Missoula, Montana. Even Eugene, Oregon and Boise, Idaho, despite being close to the same latitude, have different wind trends.
OBTW, if you know the local airport code, you can just alter the URL after the ‘k’ prefix. Regards, – Brian