51 season average temperature warmer water (from July to September) above 12°C(high average of 14°C in August) cooler water (from Dece ber to May) below 7°C (low average of 5°C in March) Table 2 – average water temperature in warm and cold seasons Trondheim weather by month. Click on each chart for more information. © WeatherSpark.com33 Precipitation The wetter season lasts from June to March (the wettest month is September). The drier season lasts from March to June (the months with the fewest wet days in Trondheim are April and May). Among wet days, precipitation may be rain, snow (specifically from October to April), or a mixture of two. Sun The length of the day in Trondheim varies extremely over the course of the year (the shortest day in December has got around 4 hours and 30 minutes of daylight; the longest day in June 21 has got around 20 hours and 30 minutes of daylight). The total daily incident solar radiation (UV and VIS waves) reaching the surface of the ground is a number which considers: • seasonal variations in the length of the day • elevation of the Sun above the horizon • radiation absorption by clouds and other atmospheric constituents. 13 https://weatherspark.com/y/68746/Average-Weather-in-Trondheim-Norway-Year-Round.
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