Average Annual Precipitation for Washington





The tables below give yearly averages for rainfall plus snowfall at cities, towns and parks in Washington.

Each place has a total for the amount of precipitation it usually receives in a year. Most locations also have 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 1981 to 2010 for the NOAA National Climatic Data Center.

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 84.5 2146
198 Clearwater 108.9 2766
210 Forks 119.7 3041
Friday Harbor, San Juan Island 24.9 633
198 Grayland 75.0 1905
213 Long Beach 78.7 1998
144 Port Angeles 25.3 642

San Juan Islands, Puget Sound & South

Annual averages for rainfall plus snowfall
Days Place Inches Milli­metres
148 Anacortes 27.8 707
163 Bellingham 35.8 910
165 Bremerton 56.4 1432
166 Everett 38.4 976
186 Longview 48.0 1219
119 Olga, Orcas Island 28.2 715
163 Olympia 50.0 1270
141 Port Townsend 19.0 484
149 Seattle 37.7 958
149 Tacoma 39.2 996
168 Vancouver 41.6 1057

Cascade Mountains

Average amount of rain and snow a year
Days Place Inches Milli­metres
187 Baker Lake Dam 97.9 2487
186 Baring 106.7 2710
Darrington 81.3 2065
Mt Adams Ranger Station 45.9 1166
189 Mt Rainier Paradise Ranger Station 118.3 3005
184 Mud Mountain Lake Dam 57.8 1468
162 Ross Dam 57.6 1463
188 Stampede Pass 81.2 2063

Eastern Washington State

Average annual precipitation
Days Place Inches Milli­metres
142 Boundary Dam 28.1 714
72 Chelan 11.4 289
103 Coulee Dam 10.8 274
75 Kennewick 7.7 196
97 Leavenworth 25.0 636
114 Pullman 20.4 517
112 Spokane 16.6 421
109 Walla Walla 20.9 530
80 Wenatchee 9.6 243
94 Winthrop 14.8 375
72 Yakima 8.3 210
Reference

National Climatic Data Center. NOAA's 1981-2010 Climate Normals.

Washington Precipitation
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