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west side of the mountain
There is more precipitation in the eastern half of the U.S. than the western half of the country. This is due to the Rockie Mountain chain that determines where the precipitation will fall. Moisture is also picked up in the Gulf of Mexico which results in more rain being deposited on the eastern half of the country.
It falls in the watersheds in the north.
Southern California is very dry because there is very little rain fall. This is because the mountains block precipitation.
I believe that would depend on the predominant direction of the wind.
The amount of rain that the mountains receive depends on the amount of moisture in the air. Mountain climates are not all the same.
Where on earth surface does most precipitation fall
Clouds
Most of the Earth's precipitation falls in the ocean.
One can never precisely predict precipitation.
Rain.
because gravity