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
Reference

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

Oregon Precipitation
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