Precipitation varies greatly throughout the range, from the wet western slopes to the arid eastern ridges. Mount Olympus, nearly tall, is a mere from the Pacific Ocean, one of the steepest reliefs globally and accounting for the high precipitation of the area, as much as of snow and rain on Mount Olympus. of rain falls on the Hoh Rainforest annually, receiving the most precipitation of anywhere in the contiguous United States. Areas to the northeast of the mountains are located in a rain shadow and receive as little as of precipitation. Annual precipitation increases to about on the edges of the rain shadow around Port Townsend, the San Juan Islands, and Everett. 80% of precipitation falls during the winter. On the coastal plain, the winter temperature stays between . During the summer it warms up to stay between .