Topography( the physicality of environmental features and resources ) affects the climate of a certain region. Clouds form at the windward side, which is a wet area of mountains where moisture and humidity takes over. Lots of trees and plants live here. When the clouds pass the opposite region next to the windward side ( which what we call Leeward side ), they evaporate and start to fade out. Now, this region is dry and rain shadows also occur.