Why do marine west coast climates have abundant precipitation?

Answer 1

Marine west coast climates have abundant precipitation because humid air from the Pacific Ocean hits the western slopes of the Coastal Ranges. The air rises up the slopes of the mountains, and it cools. As the air cools, large amounts of rain or snow fall on the western slopes. The eastern slopes lie in the rain shadow of the mountains and receive little precipitation.

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Answer 2

Marine west coast climates receive abundant precipitation because warm ocean currents lead to evaporation, creating moist air masses. When these air masses meet cooler land, they release moisture in the form of rain or snow. The combination of these factors results in a high amount of precipitation in marine west coast regions.