Fig. 3.

Wind roses for the five selected meteorological stations and different periods (see text for the definition of the periods). The annotations in green show mean wind speeds and calm wind frequencies of each period. Calm winds were defined as having hourly speeds <0.5 m s⁻¹. The radial scale denotes the frequency of counts by wind direction sector. (For interpretation of the references to colour in this figure legend, the reader is referred to the Web version of this article)