Average Annual Precipitation for Washington

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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.

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