A windrose is used to help meteorologists record and study how wind speed and direction are typically distributed at a specific location. Modern windroses show the frequency of winds blowing from certain directions over a 30 year period. This example is a windrose from LaGuardia airport in New York. The longer the plot extends, the stronger the winds from that direction and the color changes as well. Blue means calm, and light green means really strong in this particular example.
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