Indeed it often does rain more on one side than the other. Usually, wind is pushing moist air from one direction (say, off the sea) fairly consistantly. The moist air, as it is blown up the mountain, cools because of the elevation – but cool air can hold as much moisture as warm air can, so the moisture leaves the air in the form of rain or snow.
Once the air makes it to the other side of the mountain and begins its decent, it is much dryer. It becomes warmer again on its way down, making it much less likely to need to release moisture.
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