The Lewis and Clark Expedition wintered at Fort Clatsop in 1806 for 106 days, during which it rained all but 12 days and the sun appeared 6 times. The park includes sites along the Columbia River and the Pacific Coast and connects the story of the explorers with the heritage of Native people amid rainforests and coastal landscapes. The area averages 70 inches of rain a year and is the foggiest location in the Lower 48 states, with summer days usually ranging from 55 to 70 degrees and winters that are wet and mild, usually 40 to 55 degrees.