Olympic National Park (WA) Precipitation: Average Monthly Rainfall and Snowfall

This graph shows the average amount of rainfall per month in Olympic National Park (Washington State). The numbers are calculated over a 30-year period to provide a reliable average.

• A lot of rain (rainy season) falls in the months: January, February, March, April, October, November and December.
• Olympic National Park has dry periods in July and August.
• On average, November is the wettest month with 327 mm of precipitation.
• On average, July is the driest month with 15 mm of precipitation.
• The average amount of annual precipitation is 1802 mm.