Average December Temperatures for Oregon

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

You can jump to a separate table for each region of the state: Oregon Coast, Willamette Valley, Cascade Mountains, Central Oregon and Eastern Oregon.

The tables give the normals for maximum and minimum temperatures based on weather data collected from 1991 to 2020 by the US National Centers for Environmental Information.

Oregon Coast

Average December temperatures
High °F	Low °F	Place	High °C	Low °C
49	38	Astoria	9	3
53	43	Brookings	12	6
54	42	Gold Beach	12	5
48	38	Honeyman State Park	9	3
50	39	Newport	10	4
53	40	North Bend	12	5
55	41	Port Orford	13	5
51	39	Seaside	11	4
51	36	Tillamook	10	2

Willamette Valley

Average daily temperatures in December
High °F	Low °F	Place	High °C	Low °C
47	34	Corvallis	8	1
47	34	Eugene	8	1
47	36	Lebanon	9	2
46	36	Portland	8	2
47	35	Salem	9	2

Cascade Mountains

December temperatures: daily averages
High °F	Low °F	Place	High °C	Low °C
33	19	Crater Lake Park	0	-7
43	37	Detroit Lake Dam	6	3
35	26	Government Camp	2	-4
46	35	Grants Pass	8	2
35	23	Howard Prairie Lake Dam	2	-5
40	21	Klamath Falls	5	-6
38	21	Lakeview	3	-6
41	31	McKenzie Bridge	5	-1
46	33	Medford	8	0
49	37	Roseburg	10	3
41	33	Three Lynx	5	0
40	31	Toketee Falls	5	-1
38	21	Wickiup Reservoir Dam	3	-6

Central Oregon

Average December temperatures
High °F	Low °F	Place	High °C	Low °C
41	23	Bend	5	-5
40	31	Hood River	5	-1
41	21	Madras	5	-6
43	29	The Dalles	6	-1

Eastern Oregon

Average December temperatures
High °F	Low °F	Place	High °C	Low °C
39	20	Hart Mountain Antelope Refuge	4	-7
43	27	Heppner	6	-3
39	24	La Grande	4	-4
40	21	Lake Owyhee Dam	5	-6
37	20	Malheur National Wildlife Refuge	3	-7
36	22	Ontario	2	-5
44	28	Pendleton	6	-2
36	11	Seneca	2	-12
43	21	Summer Lake	6	-6

Average Temperatures for Oregon in December

Oregon Coast

Willamette Valley

Cascade Mountains

Central Oregon

Eastern Oregon

Reference

More Oregon Weather Information