Average Precipitation for Oregon in May





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

Each place has a total for the amount of precipitation it usually receives this month. Most sites 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 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 monthly precipitation in May
Days Place Inches Milli­metres
16 Astoria 3.3 84
10 Brookings 3.9 98
10 Gold Beach 3.7 94
11 Honeyman State Park 3.8 97
14 Newport 3.6 90
North Bend 3.4 86
12 Port Orford 3.8 95
15 Seaside 4.1 104
16 Tillamook 4.7 120

Willamette Valley

May averages for total rainfall plus snowfall
Days Place Inches Milli­metres
13 Corvallis 2.3 59
12 Eugene 2.7 70
15 Portland 2.7 69
12 Salem 2.2 56

Cascade Mountains

Average amount of rain and snow in May
Days Place Inches Milli­metres
11 Crater Lake Park 3.6 91
16 Detroit Lake Dam 5.9 151
16 Government Camp 5.7 145
10 Howard Prairie Lake Dam 2.1 53
7 Klamath Falls 1.1 28
9 Lakeview 1.4 36
McKenzie Bridge 4.1 105
8 Medford 1.3 33
17 Three Lynx 4.6 116
13 Toketee Falls 3.3 84
9 Wickiup Reservoir Dam 1.2 31

Central Oregon

Precipitation totals for May
Days Place Inches Milli­metres
6 Bend 0.9 23
9 Hood River 1.3 33
7 Madras 1.0 26
7 The Dalles 0.7 18

Eastern Oregon

Total precipitation during May
Days Place Inches Milli­metres
Hart Mountain Antelope Refuge 1.6 40
10 Heppner 1.7 42
10 La Grande 2.0 51
8 Lake Owyhee Dam 1.2 29
7 Malheur Wildlife Refuge 1.4 35
7 Ontario 1.3 33
9 Pendleton 1.4 34
10 Seneca 1.6 41
10 Summer Lake 1.3 33
Reference

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

Oregon Precipitation
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