Average Precipitation for Oregon in December

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

Each place has a total for the amount of precipitation it usually receives this month. There is also a count of the number of days with wet weather, 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: Oregon Coast, Willamette Valley, Cascade Mountains, Central Oregon and Eastern Oregon.

Oregon Coast

Average monthly precipitation in December
Days	Place	Inches	Millimetres
22	Astoria	10.7	271
19	Brookings	13.9	352
19	Gold Beach	13.2	335
20	Newport	11.6	295
20	North Bend	10.5	266
20	Port Orford	12.6	321
22	Seaside	11.4	290
23	Tillamook	14.7	372

Willamette Valley

December averages for total rainfall plus snowfall
Days	Place	Inches	Millimetres
22	Corvallis	7.7	196
19	Eugene	7.2	183
20	Portland	7.0	177
19	Salem	7.0	177

Cascade Mountains

Average amount of rain and snow in December
Days	Place	Inches	Millimetres
18	Crater Lake Park	11.3	287
21	Detroit Lake Dam	15.4	392
21	Government Camp	14.4	367
17	Grants Pass	6.6	166
16	Howard Prairie Lake Dam	5.9	150
12	Klamath Falls	1.8	46
11	Lakeview	2.1	53
14	Medford	3.5	90
19	Roseburg	6.3	160
22	Three Lynx	11.3	287
19	Toketee Falls	8.2	208
14	Wickiup Reservoir Dam	3.6	92

Central Oregon

Precipitation totals for December
Days	Place	Inches	Millimetres
9	Bend	2.1	53
19	Hood River	5.9	149
9	Madras	1.2	29
11	The Dalles	2.9	74

Eastern Oregon

Total precipitation during December
Days	Place	Inches	Millimetres
12	Heppner	1.3	32
11	La Grande	1.9	48
10	Lake Owyhee Dam	1.1	28
11	Ontario	1.6	40
13	Pendleton	1.5	38
13	Seneca	1.8	46
13	Summer Lake	1.9	47