Question

Why is it that areas around the saline water bodies receive less rainfall as compared to the ones around fresh water bodies?​

Answer 1

or it could be because of their placement in the world. like close the equator

Answer 2

Water in this area may have been leftover from ancient times when saline seas occupied the western U.S., and, also, as rainfall infiltrates downward into the ground, it can encounter rocks that contain highly soluble minerals, which turn the water saline.