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San Dimas, CA
Full City Profile · California · Los Angeles County County
3.2
/5.0
B
Good
34,099
Population
2,269/sq mi density
$105,833
Median Income
$49,568 per capita
$756,200
Home Value
$914,093 Zillow
$2,232
Median Rent
36.7% income on rent
65°F
Avg Temperature
330 sunny days/yr
229
Violent Crime/100K
2,446 property/100K
B
Overall
3.2 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$105,833 median income, 3.1% unemployment
C+
Affordability
2.6 / 5.0
$756,200 home value, $2,232/mo rent
F
Safety
1.0 / 5.0
229 violent crimes/100K
A
Education
4.2 / 5.0
40.3% bachelor's degree or higher
San Dimas enjoys a temperate climate with an average annual temperature of 65°F (18°C). Winters average 56°F in January while summers reach 76°F in July. The area gets 330 sunny days per year. Annual precipitation totals 14.5 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 48.
Temperature
56°F Jan (13°C)
76°F Jul (25°C)
| Annual Average | 65.1°F |
| 21% above US avg | |
| January Average | 56°F (13°C) |
| July Average | 76°F (25°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 965 ft (294 m) |
| Area | 15.4 sq mi (40.0 km²) |
| Population Density | 2,269/sq mi |
| Coordinates | 34.1080°N, 117.8085°W |
| Timezone | America/Los_Angeles |
| County | Los Angeles County County |
| Nearest Airport | Ontario International (ONT) 12 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0482 ppm |
| NO₂ (Nitrogen Dioxide) | 17.4 ppb |
| SO₂ (Sulfur Dioxide) | 0.32 ppb |
| CO (Carbon Monoxide) | 0.32 ppm |
| PM2.5 (Fine Particles) | 10.0 μg/m³ |
Natural Hazard Risk
| Overall Risk | Very High |
| Risk Score | 100.0 / 100 |
| Social Vulnerability | 55.4 / 100 |
| Community Resilience | 13.6 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | No Rating |
| Earthquake | Very High |
| Wildfire | Very High |
| Flood | Very High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively High |
| Winter Weather | Relatively Moderate |
| Lightning | Very High |
| Drought | Relatively Low |
| Cold Wave | Very Low |
| Landslide | Relatively High |
| Coastal Flood | Relatively High |
| Tsunami | Relatively Low |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
3 tsunamis recorded within 500 km. Highest wave on record: 3.1 m (10 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1930 | S. CALIFORNIA | Eruption + Earthquake | 3.1 m | 1 | 77 km |
| 1994 | WEST COAST, USA | Earthquake | 0.1 m | 57 | 68 km |
| 1855 | S. CALIFORNIA | Eruption + Earthquake | — | — | 27 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 56°F (13°C) | 3.3 in | |
| February | 55°F (13°C) | 3.5 in | Wettest |
| March | 57°F (14°C) | 3.0 in | |
| April | 61°F (16°C) | 1.2 in | |
| May | 64°F (18°C) | 0.3 in | |
| June | 70°F (21°C) | 0.0 in | Driest |
| July | 76°F (25°C) | 0.0 in | Warmest |
| August | 76°F (24°C) | 0.1 in | |
| September | 73°F (23°C) | 0.4 in | |
| October | 67°F (19°C) | 0.4 in | |
| November | 59°F (15°C) | 1.9 in | |
| December | 54°F (12°C) | 2.2 in | Coldest |
San Dimas has a seasonal temperature swing of 23°F / from 54°F in December to 76°F in July. Total annual precipitation is 16.3 inches, with February being the wettest month (3.5") and June the driest (0.0").