Annual Washington rainfall

Driest location ranked by lowest annual average precipitation: Priest Rapids Dam , central Washington, 6.84"

Wettest location ranked by highest annual average precipitation: Quinault Ranger Station, western Washington, 137.21"

Snowiest location ranked by highest annual average snowfall: Rainier Paradise Ranger Station, western Washington, 680.0"

State precipitation record for 24 hours - Mount Mitchell, southwestern Washington, 11/23-24/1986, 14.26"

State precipitation record for 1 year - Wynoochee Oxbow, western Washington, 1931, 184.56"

State snowfall record for 24 hours - Crystal Mountain, western Washington, 1/23-24/1994, 65.0"

State snow record for 1 season - Mount Baker, northern Washington, 1998-1999, 1140.0" (95 feet, U.S. record)

Quillayute, Washington and Astoria, Oregon are the cloudiest cities in the United States with 240 cloudy days per year

During July and August in western Washington, it is not unusual for two to four weeks to pass with only a few showers; but during
the wettest months of December and January, precipitation is frequently recorded on 20 to 25 days or more each month

Centralia, Washington holds the state record with 55 consecutive days with measurable precipitation

Precipitation data for other U.S. states
Data source: National Data Climatic Center

City	Avg Annual Precip	Avg Snow Annual	Avg # days of Precip	Avg # thunderstorm days	Avg # hail days
Olympia	50.79	16.7	162	4	1
Quillayute	101.72	13.1	209	7	1
Seattle	38.25	11.4	154	8	1
Spokane	16.67	48.0	154	11	1
Walla Walla	20.88	17.3	107	10	0
Yakima	8.26	24.4	69	6	0
State Average - 38.78", 29th wettest in the U.S.