On average, there are only five days each year with measurable snow. Snowfall seldom measures more than a couple of inches, and it generally lasts only a few days. The greatest measured snowfall is 16 inches. In the nearby Cascades, snowfall ranges from 120 to 300 inches per year, providing a base for an extended winter sport season, and in summer, abundant runoff for rivers, streams and lakes. The winter season is marked by relatively mild temperatures, cloudy skies and rain.
Summer produces pleasantly mild temperatures and very little precipitation.
Fall and spring are transitional in nature. At all times, marine air is a frequent moderating influence. In winter this brings the coldest weather. In summer, hot, dry continental air brings the highest temperatures. Heavy downpours are infrequent but gentle rains and drizzle occur frequently during winter months.