I can try to explain the fohneffect in English (my Dutch is not THAT good). Often the wind will come from the west towards the western coast of Norway. The air will often have a high humidity (moist), and when forced up as it hits the rising mountains, the temperature will drop and the air will get close to 100% humidity = rain. When the air gets over the mountains and falls down on the other side, its temperature will rise again, but this time it will get even warmer. A basic rule is that moist air will get 0,6 C colder for each 100 height-meter it rises, but for dry air it is 1 C pr meter. Which is the same when the air falls down; it will rise with approx 1 C pr 100m of height downwards. And because of the Gulf stream, the wind comes from the west most of the time, which is why it rains more in Bergen and the west side of Norway, than here in the eastern parts. Bergen is sometimes referred to as "rain-city" in Norway. edit: good illustration of the effect: http://de.wikipedia.org/wiki/Bild:Foehn.png