The sum of all the frequencies (including calm) should total 100%. At a glance, the longest lines indicate the predominant wind directions for any location. Using the wind rose below enter the probability of WNW winds. % WNW W WSW N NNW 30% NNE NW 20% NE 10% near calm 5.3% 10% 20% SW SE SSW 30% SSE Speed legend S ENE E ESE >5.5 m/s 3.4-5.5 1.9 3.4 0.5-1.9 Figure 17.2 Wind rose for Vancouver Airport (CYVR), Canada. Circles indicate frequency. 200 % By counting the frequency of occurrence that winds came from each compass direction (N, NNE, NE, etc.) over a period such as 10 years, and then plotting that frequency on a polar graph, the result is called a wind rose. For example, the figure shows the wind rose for Vancouver Airport (CYVR). The total length of each wind line gives the total frequency of any wind speed from that direction, while the width (or colour) of the line subdivides that frequency into the portions associated with various wind speeds. (Not all wind roses are subdivided by wind speed.) The frequency of calm winds is usually written in the centre of the circle if it fits, or is indicated off to the side. The sum of all the frequencies (including calm) should total 100%. At a glance, the longest lines indicate the predominant wind directions for any location. Using the wind rose below enter the probability of WNW winds.

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The sum of all the frequencies (including calm) should total 100%. At a glance, the longest lines indicate the predominant wind directions for any location. Using the wind rose below enter the probability of WNW winds. % WNW W WSW N NNW 30% NNE NW 20% NE 10% near calm 5.3% 10% 20% SW SE SSW 30% SSE Speed legend S ENE