http://www.wcc.nrcs.usda.gov/climate/windrose.html
The windrose is from Fresno, California in April. It is based on 30 years of hourly wind data. A windrose is a graphic tool used by meteorologists to give a succinct view of how wind speed and direction are typically distributed at a particular location. Because of its circular format, it shows the frequency of winds blowing from particular directions.
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