Which would be least likely to get rain as the clouds pass over the mountain? Depending on the height of the mountains, there might be some residual rain coming over the top of the mountain.
However, since this is not my area of expertise, I searched Google under the key words "rainfall mountains desert" to get these possible sources:
After this, I searched under "rain shadow."
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search. Also see http://hanlib.sou.edu/searchtools/.
I hope this helps. Thanks for asking.