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Cornelius, OR
Full City Profile · Oregon · Washington County County
2.9
/5.0
C+
Fair
13,700
Population
5,855/sq mi density
$90,071
Median Income
$36,142 per capita
$419,000
Home Value
$479,862 Zillow
$1,475
Median Rent
31.1% income on rent
52°F
Avg Temperature
251 sunny days/yr
273
Violent Crime/100K
2,113 property/100K
C+
Overall
2.9 / 5.0
Fair overall score based on economy, affordability, safety and education
A
Economy
4.4 / 5.0
$90,071 median income, 3.7% unemployment
A
Affordability
4.1 / 5.0
$419,000 home value, $1,475/mo rent
F
Safety
1.0 / 5.0
273 violent crimes/100K
C
Education
2.2 / 5.0
15.2% bachelor's degree or higher
Cornelius experiences four distinct seasons with an average annual temperature of 52°F (11°C). Winters average 39°F in January while summers reach 68°F in July. The area gets 251 sunny days per year. Annual precipitation totals 46.7 inches. The area receives 2.7 inches of snow annually. Air quality is rated Good with a median AQI of 32.
Temperature
39°F Jan (4°C)
68°F Jul (20°C)
| Annual Average | 52.1°F |
| 4% below US avg | |
| January Average | 39°F (4°C) |
| July Average | 68°F (20°C) |
| Sunny Days | 251 days/yr |
Geography
| Elevation | 180 ft (55 m) |
| Area | 2.3 sq mi (6.1 km²) |
| Population Density | 5,855/sq mi |
| Coordinates | 45.5189°N, 123.0510°W |
| Timezone | America/Los_Angeles |
| County | Washington County County |
| Nearest Airport | Portland International (PDX) 22 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 32.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0362 ppm |
| NO₂ (Nitrogen Dioxide) | 12.6 ppb |
| CO (Carbon Monoxide) | 0.23 ppm |
| PM2.5 (Fine Particles) | 6.2 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 96.0 / 100 |
| Social Vulnerability | 13.0 / 100 |
| Community Resilience | 74.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Relatively High |
| Wildfire | Very Low |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively High |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Moderate |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Relatively High |
| Landslide | Relatively Low |
| Coastal Flood | No Rating |
| Volcano | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
1 tsunami recorded within 500 km. Highest wave on record: 250.0 m (820 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1980 | WASHINGTON | Explosion | 250.0 m | 61 | 101 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
10 volcanoes within 200 km. Closest: West Crater (85 km).
| Name | Type | Elevation | Last Eruption | Distance |
| West Crater | Volcanic field | 1,329 m (4,360 ft) | -5750 | 85 km |
| St. Helens | Stratovolcano | 2,549 m (8,363 ft) | 2008 | 101 km |
| Indian Heaven | Shield(s) | 1,806 m (5,925 ft) | -6250 | 106 km |
| Hood | Stratovolcano | 3,426 m (11,240 ft) | 1866 | 107 km |
| Jefferson | Stratovolcano | 3,199 m (10,495 ft) | 950 | 136 km |
| Adams | Stratovolcano | 3,742 m (12,277 ft) | 950 | 143 km |
| Sand Mountain Field | Pyroclastic cone(s) | 1,664 m (5,459 ft) | -950 | 154 km |
| Belknap | Shield(s) | 2,095 m (6,873 ft) | 480 | 167 km |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 179 km |
| Three Sisters | Complex | 3,159 m (10,364 ft) | 440 | 184 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 39°F (4°C) | 7.6 in | Coldest |
| February | 43°F (6°C) | 6.2 in | |
| March | 46°F (8°C) | 5.1 in | |
| April | 50°F (10°C) | 3.2 in | |
| May | 55°F (13°C) | 2.2 in | |
| June | 60°F (16°C) | 1.6 in | |
| July | 68°F (20°C) | 0.6 in | Warmest, Driest |
| August | 66°F (19°C) | 0.9 in | |
| September | 61°F (16°C) | 1.8 in | |
| October | 53°F (11°C) | 3.5 in | |
| November | 44°F (7°C) | 7.6 in | |
| December | 39°F (4°C) | 8.3 in | Wettest |
Cornelius has a seasonal temperature swing of 29°F / from 39°F in January to 68°F in July. Total annual precipitation is 48.5 inches, with December being the wettest month (8.3") and July the driest (0.6").