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Oso, WA
Full City Profile · Washington · Skagit County County
3.6
/5.0
B+
Good
400
Population
143/sq mi density
$136,735
Median Income
$35,026 per capita
50°F
Avg Temperature
166 sunny days/yr
181
Violent Crime/100K
5,882 property/100K
B+
Overall
3.6 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$136,735 median income, 0.0% unemployment
F
Safety
1.0 / 5.0
181 violent crimes/100K
A+
Education
4.7 / 5.0
0.0% bachelor's degree or higher
Oso experiences four distinct seasons with an average annual temperature of 50°F (10°C). Winters average 35°F in January while summers reach 66°F in July. The area gets 166 sunny days per year. Annual precipitation totals 83.1 inches. Air quality is rated Good with a median AQI of 28.
Temperature
35°F Jan (2°C)
66°F Jul (19°C)
| Annual Average | 49.6°F |
| 8% below US avg | |
| January Average | 35°F (2°C) |
| July Average | 66°F (19°C) |
| Sunny Days | 166 days/yr |
Geography
| Elevation | 338 ft (103 m) |
| Area | 1.4 sq mi (3.7 km²) |
| Population Density | 143/sq mi |
| Coordinates | 48.2838°N, 121.9162°W |
| Timezone | America/Los_Angeles |
| County | Skagit County County |
| Nearest Airport | Skagit Regional (MVW) 27 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 28.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0285 ppm |
| SO₂ (Sulfur Dioxide) | 0.40 ppb |
| PM2.5 (Fine Particles) | 5.3 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 88.8 / 100 |
| Social Vulnerability | 31.7 / 100 |
| Community Resilience | 73.4 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Very Low |
| Flood | Relatively Moderate |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Relatively Moderate |
| Lightning | Relatively Low |
| Ice Storm | Relatively High |
| Drought | Very Low |
| Cold Wave | Relatively Low |
| Landslide | Relatively Moderate |
| Coastal Flood | Relatively High |
| Tsunami | Very Low |
| Volcano | Relatively High |
| Avalanche | Relatively Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
6 tsunamis recorded within 500 km. Highest wave on record: 38.0 m (125 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 2007 | CHEHALIS LAKE, CHILLIWACK | Meteorological | 38.0 m | — | 132 km |
| 1894 | PUYALLUP RIVER DELTA, TACOMA, WA | Meteorological | 3.0 m | 2 | 118 km |
| 1891 | WASHINGTON | Eruption + Earthquake | 2.4 m | — | 122 km |
| 1949 | PUGET SOUND, WA | Meteorological | 2.4 m | — | 119 km |
| 1949 | PUGET SOUND, WA | Eruption + Earthquake | — | 8 | 135 km |
| 1820 | CAMANO ISLAND, WA | Meteorological | — | — | 41 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
5 volcanoes within 200 km. Closest: Baker (55 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Baker | Stratovolcano(es) | 3,285 m (10,778 ft) | 1880 | 55 km |
| Glacier Peak | Stratovolcano | 3,213 m (10,541 ft) | 1700 | 63 km |
| Rainier | Stratovolcano | 4,392 m (14,409 ft) | 1450 | 160 km |
| Garibaldi | Stratovolcano | 2,678 m (8,786 ft) | -8060 | 191 km |
| Garibaldi Lake | Volcanic field | 2,316 m (7,598 ft) | Unknown | 200 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 35°F (2°C) | 9.7 in | Coldest |
| February | 38°F (3°C) | 7.2 in | |
| March | 41°F (5°C) | 7.1 in | |
| April | 45°F (7°C) | 5.3 in | |
| May | 51°F (11°C) | 4.0 in | |
| June | 56°F (13°C) | 3.1 in | |
| July | 66°F (19°C) | 1.9 in | Warmest, Driest |
| August | 62°F (16°C) | 2.1 in | |
| September | 57°F (14°C) | 3.7 in | |
| October | 48°F (9°C) | 6.2 in | |
| November | 41°F (5°C) | 10.4 in | Wettest |
| December | 35°F (2°C) | 10.1 in |
Oso has a seasonal temperature swing of 30°F / from 35°F in January to 66°F in July. Total annual precipitation is 70.8 inches, with November being the wettest month (10.4") and July the driest (1.9").