Average Precipitation for Washington in December





The tables below give monthly averages for rainfall plus snowfall during December at cities and other locations in Washington.

Each place has a total for the amount of precipitation it usually receives this month. 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 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 monthly precipitation in December
Days Place Inches Milli­metres
23 Aberdeen 13.4 340
23 Clearwater 15.0 382
24 Forks 17.4 442
16 Friday Harbor, San Juan Island 2.5 62
23 Grayland 11.2 285
23 Long Beach 12.2 309
18 Port Angeles 4.2 108

San Juan Islands, Puget Sound & South

December averages for total precipitation
Days Place Inches Milli­metres
19 Anacortes 3.8 96
19 Bellingham 4.3 110
19 Bremerton 9.9 252
22 Centralia 6.4 164
19 Everett 4.5 115
24 Longview 7.1 181
17 Oak Harbor, Whidbey Island 2.0 50
15 Olga, Orcas Island 3.8 97
20 Olympia 7.9 199
16 Port Townsend 2.6 66
18 Seattle 5.7 145
20 Shelton 10.9 277
20 Tacoma 6.0 153
20 Vancouver 6.8 172

Cascade Mountains

Average amount of rain and snow in December
Days Place Inches Milli­metres
21 Baker Lake Dam 14.2 359
20 Baring 14.6 370
19 Ross Dam 9.2 234

Eastern Washington State

Precipitation totals for December
Days Place Inches Milli­metres
16 Boundary Dam 3.6 91
10 Chelan 1.8 46
12 Coulee Dam 1.4 36
11 Kennewick 1.1 27
14 Leavenworth 4.5 115
10 Moses Lake 1.1 28
14 Pullman 2.8 70
14 Spokane 2.3 59
14 Walla Walla 2.2 57
10 Wenatchee 1.6 40
13 Winthrop 2.6 65
10 Yakima 1.4 37
Reference

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

Washington Precipitation
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