Vaisala Xweather Energy

Vaisala Energy Support

What does the Wind Speed Distribution Tool provide?

For your selected location and hub height, this tool provides the distribution of wind speeds throughout the year. To determine this distribution, hourly wind speeds are sorted into 1 m/s ranges. For example .5 m/s to 1.5 m/s would be one range. The vertical height of the curve represents the frequency with which wind speeds occur in each range. For example, a vertical height centered at 5 m/s reaching up to 10% means that wind speeds are between 4.5 m/s and 5.5 ms for 10% of the time.

A narrow distribution of wind speeds indicates that the wind speed is very consistent at your location. A wide distribution means that the wind speed varies greatly. In wind resource assessment, the vertical heights are often approximated using a statistical distribution called the Weibull distribution. This distribution is characterized by the shape parameter A and the scale parameter k. The solid line on the graph shows the Weibull distribution that best fits the wind speed values. The corresponding A and k values are shown in the upper left-hand corner of the tool.

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