The climate found on the western slopes of the Rockies is semi-arid.

The western slopes of the Rocky Mountains exhibit a semi-arid climate, characterized by low precipitation and distinct seasonal variations. This climate results from the rain shadow effect created by the Rockies, where moist air rises over the mountains, cools, and loses moisture, leading to drier conditions on the western side. As a result, this region experiences less rainfall compared to the eastern slopes, allowing for the growth of grasses, shrubs, and drought-resistant vegetation. The semi-arid environment supports a variety of wildlife and is popular for outdoor activities such as hiking, camping, and rock climbing. The unique climatic conditions also contribute to the overall biodiversity and scenic beauty of the western slopes, making it an attractive destination for nature lovers.