52 The average daily incident solar radiation experiences extreme seasonal variation over the year. period average daily incident solar energy per square meter brighter period (from May to August) above 4,2 kWh (June, the brightest month, average = 5,2 kWh) darker period (from October to February) below 1,1 kWh (December, the darkest month, average = 0,1 kWh) Table 3 – average daily incident solar radiation in warm and cold seasons Wind period average hourly wind speeds direction of wind windier period (from October to April) more than 10 km/h (January, the windiest month, is 14 km/h) more often from the south calmer period (from April to October) less than 10 km/h (July, the calmest month, is 7 km/h) more often from the west Table 4 – average hourly wind speeds in warm and cold seasons The percentage of hours in which the mean wind direction is from each of the four cardinal wind directions. The lightly tinted areas at the boundaries are the percentage of hours spent the implied intermediate directions (northeast, southeast, southwest, and northwest). WeatherSpark.com144 14 https://weatherspark.com/y/68746/Average-Weather-in-Trondheim-Norway-Year-Round.
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