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Three Rocks, CA
Full City Profile · California · San Benito County County
2.7
/5.0
C+
Fair
180
Population
240/sq mi density
$85,208
Median Income
$20,567 per capita
$144,800
Home Value
$219,201 Zillow
62°F
Avg Temperature
330 sunny days/yr
627
Violent Crime/100K
2,500 property/100K
C+
Overall
2.7 / 5.0
Fair overall score based on economy, affordability, safety and education
B+
Economy
3.8 / 5.0
$85,208 median income, 2.5% unemployment
A+
Affordability
5.0 / 5.0
$144,800 home value, /mo rent
F
Safety
1.0 / 5.0
627 violent crimes/100K (65% above avg)
F
Education
1.2 / 5.0
2.0% bachelor's degree or higher
Three Rocks enjoys a temperate climate with an average annual temperature of 62°F (17°C). Winters average 46°F in January while summers reach 80°F in July. The area gets 330 sunny days per year. Annual precipitation totals 11.3 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 48.
Temperature
46°F Jan (8°C)
80°F Jul (27°C)
| Annual Average | 62.4°F |
| 16% above US avg | |
| January Average | 46°F (8°C) |
| July Average | 80°F (27°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 409 ft (125 m) |
| Area | 0.8 sq mi (1.9 km²) |
| Population Density | 240/sq mi |
| Coordinates | 36.5051°N, 120.3935°W |
| Timezone | America/Los_Angeles |
| County | San Benito County County |
| Nearest Airport | Fresno Yosemite International (FAT) 42 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0408 ppm |
| PM2.5 (Fine Particles) | 4.1 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 85.2 / 100 |
| Social Vulnerability | 10.6 / 100 |
| Community Resilience | 56.0 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively Moderate |
| Flood | Relatively Low |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Very Low |
| Drought | Relatively High |
| Cold Wave | No Rating |
| Landslide | Relatively Moderate |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
2 tsunamis recorded within 500 km. Highest wave on record: 1.0 m (3 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 145 km |
| 1901 | MONTEREY BAY, N. CALIFORNIA | Eruption + Earthquake | — | — | 57 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
3 volcanoes within 200 km. Closest: Mammoth Mountain (174 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Mammoth Mountain | Lava dome(s) | 3,369 m (11,053 ft) | 1260 | 174 km |
| Golden Trout Creek | Volcanic field | 2,886 m (9,469 ft) | -5550 | 186 km |
| Mono-Inyo Craters | Lava dome(s) | 2,796 m (9,173 ft) | 1380 | 188 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 46°F (8°C) | 1.3 in | Coldest |
| February | 51°F (11°C) | 1.4 in | Wettest |
| March | 55°F (13°C) | 1.1 in | |
| April | 60°F (16°C) | 0.6 in | |
| May | 67°F (20°C) | 0.2 in | |
| June | 74°F (23°C) | 0.0 in | |
| July | 80°F (27°C) | 0.0 in | Warmest, Driest |
| August | 78°F (25°C) | 0.0 in | |
| September | 74°F (23°C) | 0.3 in | |
| October | 66°F (19°C) | 0.4 in | |
| November | 54°F (12°C) | 0.9 in | |
| December | 46°F (8°C) | 1.0 in |
Three Rocks has a seasonal temperature swing of 34°F / from 46°F in January to 80°F in July. Total annual precipitation is 7.2 inches, with February being the wettest month (1.4") and July the driest (0.0").