Average Annual Precipitation for Washington





The tables below give yearly averages for rainfall plus snowfall at cities and other locations in Washington state.

Each place has a total for the amount of precipitation it usually receives in a year. There is also information on the number of days with wet weather. That includes the days when precipitation amounts to 0.01 inches (0.25 millimetres) or more.

The annual precipitation totals are averages based on weather data collected from 1991 to 2020 for the US National Centers for Environmental Information.

You can jump to a separate table for each region of the state: Olympic Peninsula & West Coast, San Juan Islands & Puget Sound, Cascade Mountains and Eastern Washington.

Olympic Peninsula & West Coast

Average yearly precipitation
Days Place Inches Milli­metres
192 Aberdeen 84.9 2157
199 Clearwater 109.7 2787
215 Forks 119.9 3046
144 Friday Harbor, San Juan Island 18.5 469
204 Grayland 75.2 1910
214 Long Beach 78.5 1994
151 Port Angeles 26.5 674

San Juan Islands, Puget Sound & South

Annual averages for rainfall plus snowfall
Days Place Inches Milli­metres
150 Anacortes 29.0 736
169 Bellingham 34.7 882
167 Bremerton 56.9 1446
172 Centralia 41.6 1056
178 Everett 33.4 848
192 Longview 48.1 1222
148 Oak Harbor, Whidbey Island 19.9 506
125 Olga, Orcas Island 29.2 741
163 Olympia 50.6 1286
141 Port Townsend 19.1 486
156 Seattle 39.3 999
167 Shelton 67.9 1725
156 Tacoma 40.8 1037
163 Vancouver 42.3 1074

Cascade Mountains

Average amount of rain and snow a year
Days Place Inches Milli­metres
188 Baker Lake Dam 98.2 2495
184 Baring 109.9 2791
168 Ross Dam 60.8 1543

Eastern Washington State

Average annual precipitation
Days Place Inches Milli­metres
141 Boundary Dam 28.2 716
71 Chelan 12.0 304
95 Coulee Dam 11.1 281
77 Kennewick 7.9 200
99 Leavenworth 25.7 653
74 Moses Lake 7.8 198
115 Pullman 20.4 518
113 Spokane 16.5 418
109 Walla Walla 18.7 476
67 Wenatchee 9.0 229
97 Winthrop 15.2 386
72 Yakima 8.0 203
Reference

NOAA National Centers for Environmental Information (NCEI). Climate Normals.

Washington Precipitation
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