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Diablo Grande, CA
Full City Profile · California · Stanislaus County County
3.7
/5.0
B+
Good
1,488
Population
346/sq mi density
$160,741
Median Income
$50,331 per capita
$530,200
Home Value
$504,391 Zillow
$3,501
Median Rent
30.1% income on rent
65°F
Avg Temperature
330 sunny days/yr
191
Violent Crime/100K
2,984 property/100K
B+
Overall
3.7 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.9 / 5.0
$160,741 median income, 2.6% unemployment
A+
Affordability
4.8 / 5.0
$530,200 home value, $3,501/mo rent
F
Safety
1.0 / 5.0
191 violent crimes/100K
B+
Education
3.9 / 5.0
36.2% bachelor's degree or higher
Diablo Grande enjoys a temperate climate with an average annual temperature of 65°F (18°C). Winters average 49°F in January while summers reach 81°F in July. The area gets 330 sunny days per year. Annual precipitation totals 11.7 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 48.
Temperature
49°F Jan (10°C)
81°F Jul (27°C)
| Annual Average | 65.0°F |
| 20% above US avg | |
| January Average | 49°F (10°C) |
| July Average | 81°F (27°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 1,060 ft (323 m) |
| Area | 5.1 sq mi (13.2 km²) |
| Population Density | 346/sq mi |
| Coordinates | 37.3990°N, 121.2635°W |
| Timezone | America/Los_Angeles |
| County | Stanislaus County County |
| Nearest Airport | Norman Y Mineta San Jose International (SJC) 37 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0458 ppm |
| NO₂ (Nitrogen Dioxide) | 12.4 ppb |
| CO (Carbon Monoxide) | 0.22 ppm |
| PM2.5 (Fine Particles) | 10.4 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 96.9 / 100 |
| Social Vulnerability | 32.0 / 100 |
| Community Resilience | 33.9 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Relatively Low |
| Lightning | Relatively High |
| Drought | Very High |
| Cold Wave | No Rating |
| Landslide | Relatively Low |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
5 tsunamis recorded within 500 km. Highest wave on record: 4.5 m (15 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1868 | N. CALIFORNIA | Eruption + Earthquake | 4.5 m | 30 | 81 km |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 68 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 92 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 114 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | — | — | 61 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Mammoth Mountain (199 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Mammoth Mountain | Lava dome(s) | 3,369 m (11,053 ft) | 1260 | 199 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 49°F (10°C) | 3.5 in | Wettest |
| February | 50°F (10°C) | 2.8 in | |
| March | 53°F (11°C) | 2.6 in | |
| April | 57°F (14°C) | 1.3 in | |
| May | 64°F (18°C) | 0.3 in | |
| June | 71°F (22°C) | 0.1 in | |
| July | 81°F (27°C) | 0.0 in | Warmest, Driest |
| August | 77°F (25°C) | 0.1 in | |
| September | 73°F (23°C) | 0.4 in | |
| October | 66°F (19°C) | 0.9 in | |
| November | 54°F (12°C) | 2.7 in | |
| December | 47°F (8°C) | 2.7 in | Coldest |
Diablo Grande has a seasonal temperature swing of 34°F / from 47°F in December to 81°F in July. Total annual precipitation is 17.5 inches, with January being the wettest month (3.5") and July the driest (0.0").