wind rose

a map symbol showing, for a given locality or area, the frequency and strength of the wind from various directions.
a diagram showing the relation of wind direction to other weather conditions at a given location.

1590–1600 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
wind rose (wɪnd)
a diagram with radiating lines showing the frequency and strength of winds from each direction affecting a specific place

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Encyclopedia Britannica

wind rose

map diagram that summarizes information about the wind at a particular location over a specified time period. A wind rose was also, before the use of magnetic compasses, a guide on mariners' charts to show the directions of the eight principal winds. The modern wind rose used by meteorologists gives the percentage of the time the wind blows from each direction during the observation period; it sometimes shows the strengths of these winds and the percentage of the time calm air or light winds are observed. This wind rose usually has eight radiating lines, whose lengths are proportional to wind frequency, and shows wind strength by the thickness of the lines or by feathers attached to them. The frequency of calm or nearly calm air is given as a number in the centre

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
When the tide turned, the wind rose and the water grew ever rougher.
The above link takes you to an ftp server that houses the wind rose plot images.
Then click and drag on the white boxes around the wind rose to make adjustments.
The length of each spoke on a wind rose indicates how often the wind comes from
  this direction.
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