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Monmouth, OR
Full City Profile · Oregon · Polk County County
2.9
/5.0
C+
Fair
11,176
Population
4,989/sq mi density
$66,858
Median Income
$28,060 per capita
$380,500
Home Value
$469,807 Zillow
$1,137
Median Rent
29.7% income on rent
53°F
Avg Temperature
251 sunny days/yr
141
Violent Crime/100K
1,204 property/100K
C+
Overall
2.9 / 5.0
Fair overall score based on economy, affordability, safety and education
A
Economy
4.0 / 5.0
$66,858 median income, 4.2% unemployment
B
Affordability
3.5 / 5.0
$380,500 home value, $1,137/mo rent
F
Safety
1.0 / 5.0
141 violent crimes/100K
B
Education
3.2 / 5.0
27.9% bachelor's degree or higher
Monmouth experiences four distinct seasons with an average annual temperature of 53°F (12°C). Winters average 41°F in January while summers reach 67°F in July. The area gets 251 sunny days per year. Annual precipitation totals 47.8 inches. Air quality is rated Good with a median AQI of 32.
Temperature
41°F Jan (5°C)
67°F Jul (20°C)
| Annual Average | 53.1°F |
| 2% below US avg | |
| January Average | 41°F (5°C) |
| July Average | 67°F (20°C) |
| Sunny Days | 251 days/yr |
Geography
| Elevation | 201 ft (61 m) |
| Area | 2.2 sq mi (5.8 km²) |
| Population Density | 4,989/sq mi |
| Coordinates | 44.8513°N, 123.2286°W |
| Timezone | America/Los_Angeles |
| County | Polk County County |
| Nearest Airport | Mahlon Sweet Field (EUG) 50 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 32.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 72.8 / 100 |
| Social Vulnerability | 18.2 / 100 |
| Community Resilience | 64.5 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively Low |
| Ice Storm | Relatively Moderate |
| Drought | Very Low |
| Cold Wave | Very Low |
| Landslide | Relatively Low |
| Coastal Flood | No Rating |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km.
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1700 | CASCADIA SUBDUCTION ZONE | Earthquake | — | 2 | 140 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
10 volcanoes within 200 km. Closest: Jefferson (115 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Jefferson | Stratovolcano | 3,199 m (10,495 ft) | 950 | 115 km |
| Sand Mountain Field | Pyroclastic cone(s) | 1,664 m (5,459 ft) | -950 | 115 km |
| Belknap | Shield(s) | 2,095 m (6,873 ft) | 480 | 127 km |
| Hood | Stratovolcano | 3,426 m (11,240 ft) | 1866 | 134 km |
| Three Sisters | Complex | 3,159 m (10,364 ft) | 440 | 141 km |
| West Crater | Volcanic field | 1,329 m (4,360 ft) | -5750 | 145 km |
| Bachelor | Stratovolcano | 2,763 m (9,065 ft) | -5800 | 156 km |
| Indian Heaven | Shield(s) | 1,806 m (5,925 ft) | -6250 | 163 km |
| St. Helens | Stratovolcano | 2,549 m (8,363 ft) | 2008 | 171 km |
| Davis Lake | Volcanic field | 2,163 m (7,096 ft) | -2790 | 181 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 41°F (5°C) | 7.9 in | |
| February | 43°F (6°C) | 6.3 in | |
| March | 47°F (8°C) | 5.6 in | |
| April | 50°F (10°C) | 3.1 in | |
| May | 55°F (13°C) | 2.1 in | |
| June | 60°F (16°C) | 1.3 in | |
| July | 67°F (20°C) | 0.6 in | Warmest, Driest |
| August | 66°F (19°C) | 0.8 in | |
| September | 62°F (17°C) | 1.6 in | |
| October | 53°F (12°C) | 3.5 in | |
| November | 45°F (7°C) | 7.7 in | |
| December | 40°F (4°C) | 8.9 in | Coldest, Wettest |
Monmouth has a seasonal temperature swing of 27°F / from 40°F in December to 67°F in July. Total annual precipitation is 49.4 inches, with December being the wettest month (8.9") and July the driest (0.6").