While keeping warm is good, too much of a good thing can sometimes lead to problems. Learn how human introduced carbon dioxide and other greenhouse gasses might be affecting global climate patterns and keep updated on climate change . Changes in temperature, precipitation, ocean currents and sea level will undoubtedly affect forest and intertidal communities of Olympic National Park and the world. The climate is predominantly a marine type with cool summers, mild but rather cloudy winters, moist air, and a small daily range in temperatures. The weather is extremely unpredictable.
Rainfall is quite varied.
Sequim, on the northeast side of the peninsula receives an average of about seventeen inches of precipitation a year. While forty air miles to the west, in the rain forest valleys, precipitation can average 140 to 167 inches per year. Seventy-six percent of the yearly precipitation falls during the six months between October 1 and March 31. There is no definite time for the beginning and ending of the dry or rainy seasons. The transition is gradual and variable.