http://www.nc-climate.ncsu.edu/windrose.php
A wind rose is a graphical tool used to show wind speed and wind
direction for a particular location over a specified period of time. The
wind rose is
divided into a number of spokes which represent the frequency of winds
blowing from a particular direction. For example, the longest spoke on
the wind rose
represents the greatest frequency of winds blowing from that particular
direction over the specified time frame.Above is the wind rose for KRDU.
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