Average Temperatures for Washington in December





Average temperatures for December at cities, towns, parks and lakes throughout Washington are listed below in degrees Fahrenheit and Celsius.

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.

The tables give the normals for maximum and minimum temperatures based on weather data collected from 1981 to 2010 by the US National Climatic Data Center.

Olympic Peninsula & West Coast

Average December temperatures
High °F Low °F Place High °C Low °C
47 36 Aberdeen 8 2
45 34 Clearwater 7 1
44 34 Forks 7 1
45 35 Friday Harbor, San Juan Island 7 2
48 36 Grayland 9 2
48 36 Long Beach 9 2
44 37 Port Angeles 7 3

San Juan Islands, Puget Sound & South

Average daily temperatures in December
High °F Low °F Place High °C Low °C
46 35 Anacortes 8 2
44 32 Bellingham 7 0
45 35 Bremerton 7 1
46 33 Everett 8 1
46 35 Longview 8 1
46 35 Olga, Orcas Island 8 1
44 33 Olympia 7 0
45 38 Port Townsend 7 3
47 36 Seattle 8 2
47 36 Tacoma 8 2
46 32 Vancouver 8 0

Cascade Mountains

December temperatures: daily averages
High °F Low °F Place High °C Low °C
38 30 Baker Lake Dam 3 -1
41 32 Baring 5 0
42 30 Darrington 6 -1
36 24 Mt Adams Ranger Station 2 -4
34 21 Mt Rainier Paradise Ranger Station 1 -6
44 32 Mud Mountain Lake Dam 7 0
38 30 Ross Dam 3 -1
31 22 Stampede Pass 0 -6

Eastern Washington State

Average December temperatures
High °F Low °F Place High °C Low °C
32 20 Boundary Dam 0 -7
33 24 Chelan 0 -4
32 22 Coulee Dam 0 -5
40 29 Kennewick 4 -2
33 20 Leavenworth 0 -7
35 24 Pullman 2 -4
32 23 Spokane 0 -5
39 28 Walla Walla 4 -2
34 23 Wenatchee 1 -5
29 14 Winthrop -2 -10
36 21 Yakima 2 -6
Reference

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

Washington Temperatures
Back to Top