Olympic has a moderate marine climate with pleasant summers and mild, wet winters. Summers are generally fair and warm, with high temperatures usually between 65� and 75� F. Summer is the driest season, with heavier precipitation during the rest of the year. Winters are mild, with temperatures at lower elevations in the 30's and 40's. At higher elevations, snowfall is generally heavy, with accumulations of up to 10 feet common. Closer to sea level, much of the precipitation comes as rain, with some infrequent snow fall.
At any time of year, visitors should come prepared for a variety of conditions. Rain gear and layered clothing are a must.
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 airline 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 01 Oct and 31 Mar. There is no definite time for the beginning and ending of the dry or rainy seasons. The transition is gradual and variable.
Spring is mostly wet, mild and often windy. Higher elevations are cooler with possible snow flurries. Temperatures usually range from 35� F to 60� F.
Summer is generally fair and warm. Afternoon temperatures in the warmest summer months average from 65� F to 70� F, occasionally reaching 80� F. A temperature of 85� F is considered unusually warm. Night time temperatures can drop as low as 45� F. Frequently, during the latter half of the summer and early fall, fog banks and low clouds form over the ocean and move inland at night. Tops of the clouds are generally below 3000 feet; thus higher elevations are sometimes clear while the lower valleys are filled with fog. Fog sometimes disappears before mid-day. On most summer afternoons near the water, a moderate to cool breeze can be expected. A few thunderstorms usually occur each summer, especially in the higher elevations. Normally very little rain falls during the summer months but it has also been known to rain for several days during this period.
Fall is usually cool and wet with occasional winds. Early snow storms are possible in the mountains. Temperatures usually range from 35� F to 65� F.
Winter season can have afternoon temperatures in the 40's and night time readings are usually in the upper 20's or lower 30's. In lower elevations and near the water, snow seldom reaches a depth in excess of six to ten inches or remains on the ground more than a few days. However, snowfall and depth on the ground increases dramatically along the slopes and tops of the mountains.
|Avg High - �F||40.8||45.3||50.1||56.8||63.9||68.2||73.9||74.1||68.5||57.2||46.6||42.0||57.3|
|Avg Low - �F||30.8||32.6||33.9||37.2||42.0||46.5||49.9||50.8||47.4||41.0||35.6||32.4||40.0|
|Avg Precip (in)||8.94||7.28||5.91||3.35||1.75||1.17||0.76||1.16||1.90||5.21||9.23||9.84||56.50|
|Avg Snowfall (in)||8.2||2.4||1.5||0.0||0.0||0.0||0.0||0.0||0.0||0.0||1.3||3.6||17.1|
|Avg Snow Depth (in)||1.0||1.0||1.0||0.0||0.0||0.0||0.0||0.0||0.0||0.0||0.0||0.0||0.0|
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