Average Precipitation for Washington in December





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

Each place has a total for the amount of precipitation it usually receives this month. Most sites 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 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 monthly precipitation in December
Days Place Inches Milli­metres
22 Aberdeen 12.9 327
23 Clearwater 14.3 364
23 Forks 16.8 426
Friday Harbor, San Juan Island 2.8 70
21 Grayland 10.8 274
22 Long Beach 11.7 296
17 Port Angeles 4.1 105

San Juan Islands, Puget Sound & South

December averages for total precipitation
Days Place Inches Milli­metres
18 Anacortes 3.4 87
18 Bellingham 4.2 107
19 Bremerton 10.1 256
19 Everett 5.2 131
22 Longview 6.8 173
14 Olga, Orcas Island 3.5 90
20 Olympia 7.5 189
16 Port Townsend 2.5 62
17 Seattle 6.1 154
19 Tacoma 5.5 140
20 Vancouver 6.4 163

Cascade Mountains

Average amount of rain and snow in December
Days Place Inches Milli­metres
20 Baker Lake Dam 13.6 344
19 Baring 14.0 355
Darrington 12.1 308
Mt Adams Ranger Station 8.6 219
21 Mt Rainier Paradise Ranger Station 17.2 436
18 Mud Mountain Lake Dam 5.8 148
17 Ross Dam 8.5 215
20 Stampede Pass 11.3 286

Eastern Washington State

Precipitation totals for December
Days Place Inches Milli­metres
15 Boundary Dam 3.5 88
10 Chelan 1.6 40
14 Coulee Dam 1.5 37
10 Kennewick 1.1 29
14 Leavenworth 4.5 114
13 Pullman 2.5 64
13 Spokane 2.3 58
14 Walla Walla 2.5 63
12 Wenatchee 1.6 40
13 Winthrop 2.5 64
10 Yakima 1.5 39
Reference

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

Washington Precipitation
Back to Top