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Børtveit is known to be a place with a lot of rain. We must go to Samnanger or Indre Matre to find a higher rainfall. The average rainfall on Børtveit is 2871 millimetres, Slåtterøy has only 1328 millimetres and Fitjar 1610 millimetres.

There may be several reasons for the high amount of rainfall on Børtveit, but the topography in the area can explain most of it. The steep cliff that divides the mountainous area from the lowland on Stord gives a natural deflection to the wind that comes from the south. Moist wind masses get thereby pressed together. This increases the precipitation in the area farthest to the south in Langenuen.

West of Børtveit lies Mehamarsåto at 749 metres elevation. When wind and rain come from the west, the moist air is pressed up, and the rainfall increases with elevation. There is usually most rainfall on the west side, but when the wind is strong, much of the precipitation will blow over the mountaintops before it falls on the lee side where the landscape drops sharply down toward the fjord. There are many areas in the county where the topography results in an unusually large amount of rainfall. Børtveit is one of few such places having its own weather station.

  • Comparison with the precipitation on Slåtterøy, shown according to wind direction

Comparison with the precipitation on Slåtterøy, shown according to wind direction, shows the distinctive difference between rainfall from all wind directions. There is, nonetheless, most precipitation at both stations when the wind blows from east-southeast to west-northwest. (Svein Nord)