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Walnut, CA
Full City Profile · California · Orange County County
3.4
/5.0
B
Good
27,857
Population
3,099/sq mi density
$133,762
Median Income
$51,555 per capita
$972,500
Home Value
$1,179,100 Zillow
$3,120
Median Rent
34.5% income on rent
65°F
Avg Temperature
330 sunny days/yr
126
Violent Crime/100K
1,282 property/100K
B
Overall
3.4 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.9 / 5.0
$133,762 median income, 2.1% unemployment
C+
Affordability
2.6 / 5.0
$972,500 home value, $3,120/mo rent
F
Safety
1.0 / 5.0
126 violent crimes/100K
A+
Education
5.0 / 5.0
55.3% bachelor's degree or higher
Walnut 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 | 894 ft (272 m) |
| Area | 9.0 sq mi (23.3 km²) |
| Population Density | 3,099/sq mi |
| Coordinates | 34.0372°N, 117.8556°W |
| Timezone | America/Los_Angeles |
| County | Orange County County |
| Nearest Airport | Ontario International (ONT) 15 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0440 ppm |
| NO₂ (Nitrogen Dioxide) | 18.4 ppb |
| CO (Carbon Monoxide) | 0.35 ppm |
| PM2.5 (Fine Particles) | 9.7 μg/m³ |
Natural Hazard Risk
| Overall Risk | Very High |
| Risk Score | 99.8 / 100 |
| Social Vulnerability | 24.9 / 100 |
| Community Resilience | 16.3 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Hurricane | No Rating |
| Earthquake | Very High |
| Wildfire | Relatively High |
| Flood | Very High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively High |
| Winter Weather | Very Low |
| Lightning | Relatively Moderate |
| Drought | Relatively Low |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Relatively High |
| Tsunami | Relatively Low |
| Avalanche | Very Low |
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 | 73 km |
| 1994 | WEST COAST, USA | Earthquake | 0.1 m | 57 | 66 km |
| 1855 | S. CALIFORNIA | Eruption + Earthquake | — | — | 24 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 56°F (13°C) | 3.4 in | |
| February | 57°F (14°C) | 3.6 in | Wettest |
| March | 59°F (15°C) | 3.1 in | |
| April | 62°F (17°C) | 1.0 in | |
| May | 66°F (19°C) | 0.2 in | |
| June | 71°F (22°C) | 0.1 in | |
| July | 76°F (25°C) | 0.0 in | Warmest, Driest |
| August | 76°F (25°C) | 0.1 in | |
| September | 74°F (23°C) | 0.3 in | |
| October | 68°F (20°C) | 0.5 in | |
| November | 60°F (16°C) | 1.7 in | |
| December | 55°F (13°C) | 2.2 in | Coldest |
Walnut has a seasonal temperature swing of 21°F / from 55°F in December to 76°F in July. Total annual precipitation is 16.2 inches, with February being the wettest month (3.6") and July the driest (0.0").