Definition: Wind rose

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Wind rose

A diagram that shows the average percentage of time that the wind blows from different directions, typically on a monthly or annual basis.[1][2]

Wikipedia Definition

A wind rose 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. Historically, wind roses were predecessors of the compass rose (found on maps), as there was no differentiation between a cardinal direction and the wind which blew from such a direction. Using a polar coordinate system of gridding, the frequency of winds over a time period is plotted by wind direction, with color bands showing wind speed ranges. The direction of the longest spoke shows the wind direction with the greatest frequency.




References
  1. http://www1.eere.energy.gov/site_administration/glossary.html
  2. http://wiki.windpower.org/index.php/The_wind_rose