http://www.vistadatavision.com/wind-rose/
A windrose is very useful in various occupations such as meteorology to measure and display direction and wind speed's distribution at a certain location. It measures that relative frequency of wind blowing from a certain direction over time. The length of each spoke is related to the frequency per unit of time. In this particular windrose, over the course of thirty years 13% of the wind this place felt came from the east. Very little wind came from the west.
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