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Sea Ranch, CA
Full City Profile · California · Sonoma County County
3.0
/5.0
B
Good
1,200
Population
74/sq mi density
$121,731
Median Income
$84,896 per capita
$1,198,200
Home Value
$571,992 Zillow
$1,350
Median Rent
10.8% income on rent
54°F
Avg Temperature
302 sunny days/yr
171
Violent Crime/100K
1,951 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$121,731 median income, 0.0% unemployment
F
Affordability
1.1 / 5.0
$1,198,200 home value, $1,350/mo rent
F
Safety
1.0 / 5.0
171 violent crimes/100K
A+
Education
5.0 / 5.0
72.1% bachelor's degree or higher
Sea Ranch experiences four distinct seasons with an average annual temperature of 54°F (12°C). Winters average 49°F in January while summers reach 57°F in July. The area gets 302 sunny days per year. Annual precipitation totals 39.2 inches. Air quality is rated Good with a median AQI of 48.
Temperature
49°F Jan (10°C)
57°F Jul (14°C)
| Annual Average | 53.6°F |
| 1% below US avg | |
| January Average | 49°F (10°C) |
| July Average | 57°F (14°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 501 ft (153 m) |
| Area | 16.2 sq mi (41.9 km²) |
| Population Density | 74/sq mi |
| Coordinates | 38.7253°N, 123.4583°W |
| Timezone | America/Los_Angeles |
| County | Sonoma County County |
| Nearest Airport | San Francisco International (SFO) 96 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0321 ppm |
| NO₂ (Nitrogen Dioxide) | 5.8 ppb |
| CO (Carbon Monoxide) | 0.29 ppm |
| PM2.5 (Fine Particles) | 5.0 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 99.1 / 100 |
| Social Vulnerability | 29.8 / 100 |
| Community Resilience | 66.2 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively High |
| Wildfire | Relatively High |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very Low |
| Lightning | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Relatively Moderate |
| Tsunami | Very Low |
| 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: 0.1 m (0 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 141 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (66 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 66 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 49°F (10°C) | 8.5 in | Wettest |
| February | 49°F (9°C) | 6.5 in | |
| March | 50°F (10°C) | 6.0 in | |
| April | 52°F (11°C) | 2.8 in | |
| May | 55°F (13°C) | 0.8 in | |
| June | 59°F (15°C) | 0.3 in | |
| July | 57°F (14°C) | 0.1 in | Driest |
| August | 62°F (17°C) | 0.3 in | Warmest |
| September | 62°F (16°C) | 0.7 in | |
| October | 58°F (15°C) | 2.6 in | |
| November | 52°F (11°C) | 6.8 in | |
| December | 48°F (9°C) | 7.2 in | Coldest |
Sea Ranch has a seasonal temperature swing of 14°F / from 48°F in December to 62°F in August. Total annual precipitation is 42.6 inches, with January being the wettest month (8.5") and July the driest (0.1").