Average Annual Precipitation for Oregon

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The tables below give yearly averages for rainfall plus snowfall at cities, towns and parks in Oregon.

Each place has a total for the amount of precipitation it usually receives in a year. Most locations also have 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 annual precipitation totals are averages based on weather data collected from 1981 to 2010 for the NOAA National Climatic Data Center.

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 yearly precipitation
Days Place Inches Millimetres
191 Astoria 67.3 1708
141 Brookings 77.2 1961
145 Gold Beach 77.1 1957
153 Honeyman State Park 71.0 1803
174 Newport 67.2 1708
  – North Bend 64.9 1649
154 Port Orford 72.6 1844
181 Seaside 75.4 1914
194 Tillamook 88.0 2235

Willamette Valley

Annual averages for rainfall plus snowfall
Days Place Inches Millimetres
166 Corvallis 42.7 1085
144 Eugene 46.1 1171
164 Portland 43.5 1104
144 Salem 39.7 1008

Cascade Mountains

Average amount of rain and snow a year
Days Place Inches Millimetres
146 Crater Lake Park 66.2 1682
176 Detroit Lake Dam 90.7 2304
176 Government Camp 87.3 2217
115 Howard Prairie Lake Dam 31.5   799
  90 Klamath Falls 14.2   360
  91 Lakeview 14.7   373
  – McKenzie Bridge 68.4 1736
103 Medford 18.4   466
176 Three Lynx 70.5 1791
151 Toketee Falls 48.3 1227
108 Wickiup Reservoir Dam 21.3   542

Central Oregon

Average annual precipitation
Days Place Inches Millimetres
  72 Bend 11.4   289
135 Hood River 31.3   795
  71 Madras 10.5   265
  93 The Dalles 14.6   370

Eastern Oregon

Annual precipitation totals
Days Place Inches Millimetres
  – Hart Mountain Antelope Refuge 12.5   318
108 Heppner 14.0   356
  97 La Grande 16.5   420
  79 Lake Owyhee Dam   9.7   246
  67 Malheur Wildlife Refuge 10.0   253
  70 Ontario 10.1   256
  98 Pendleton 12.7   322
106 Seneca 13.8   352
104 Summer Lake 13.3   338
Reference

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

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