Examining winds from the southeast (the longest spoke) one can determine that approximately 1% of the time the wind blows from the southeast at speeds between 3.6 and 7.2 kilometer per hour. These wind roses also provide details on speeds from different directions. This also shows that the wind rarely blows from the northwest. This is quickly calculated by taking the sum of the frequencies of each of these directions (13+16+10=39%). In fact, the 3 spokes around the southeast direction (ESE, SE and SSE) comprise 39% of all hourly wind directions. This rose shows that the winds at Chennai during the period blow from the southeast much of the time. All wind roses shown here use 16 cardinal directions, Percentage of time that winds blow from a particular direction and at certain speed ranges. Each spoke is broken down into discrete frequency categories that show the The wind roses shown here contain additional information. It is the wind rose for Chennai, India based on three months of hourly wind data (all hours of the day). Each concentric circle represents a different frequency,Įmanating from zero at the center to increasing frequencies at the outer circles.Īn example is shown below. The length of each "spoke" around theĬircle is related to the frequency of time that the wind blows from a particular direction. Presented in a circular format, the wind rose shows the frequency of winds blowing FROM particular directions. A wind rose gives a very concise but information-laden view of how wind speed and direction are typically distributed at a particular location.
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