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What the picture depicts is very related to the weather patterns of the cities of Perris or Hement, and the cities of Palm Desert or Palm Spring.

Explanation:

The reason is that Perris and Hemet are to the west of Mount Saint Jacinto, and they receive most of the moisture that the mount creates when cloudes clash against it. Palm Desert and Palm Spring, on the other hand, are located to the east of the Mount, in the rain shadow region, and as a result, these two cities recieve practically no precipitation, and, as their name implies, their climate is desertic.