A wind rose is a circular graph which measures the direction, intensity, and frequency of winds in a particular area. The example graph is from Klamath Falls, Oregon and shows wind data from the start of 2006 through the end of 2010. We can see that the strongest and most frequent winds blew North North West, and that the next most frequent winds were low speed winds headed South. The wind rose is a very easy map to read as direction and length represent direction and frequency, with a color indication of wind speed, or intensity.
http://nj.usgs.gov/grapher/tutorial/examples.html
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