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Altadena, CA
Full City Profile · California · Los Angeles County County
3.1
/5.0
B
Good
41,921
Population
4,949/sq mi density
$129,123
Median Income
$65,192 per capita
$1,073,500
Home Value
$1,094,611 Zillow
$2,250
Median Rent
33.0% income on rent
66°F
Avg Temperature
326 sunny days/yr
281
Violent Crime/100K
2,471 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.6 / 5.0
$129,123 median income, 4.7% unemployment
D
Affordability
2.0 / 5.0
$1,073,500 home value, $2,250/mo rent
F
Safety
1.0 / 5.0
281 violent crimes/100K
A+
Education
5.0 / 5.0
52.7% bachelor's degree or higher
Altadena enjoys a temperate climate with an average annual temperature of 66°F (19°C). Winters average 57°F in January while summers reach 76°F in July. The area gets 326 sunny days per year. Annual precipitation totals 20.1 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 48.
Temperature
57°F Jan (14°C)
76°F Jul (24°C)
| Annual Average | 66.0°F |
| 22% above US avg | |
| January Average | 57°F (14°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 326 days/yr |
Geography
| Elevation | 1,414 ft (431 m) |
| Area | 8.7 sq mi (22.6 km²) |
| Population Density | 4,949/sq mi |
| Coordinates | 34.1922°N, 118.1356°W |
| Timezone | America/Los_Angeles |
| County | Los Angeles County County |
| Nearest Airport | Bob Hope (BUR) 13 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 | 50 km |
| 1994 | WEST COAST, USA | Earthquake | 0.1 m | 57 | 37 km |
| 1855 | S. CALIFORNIA | Eruption + Earthquake | — | — | 11 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 57°F (14°C) | 3.9 in | |
| February | 48°F (9°C) | 4.1 in | Wettest |
| March | 50°F (10°C) | 3.5 in | |
| April | 54°F (12°C) | 1.6 in | |
| May | 59°F (15°C) | 0.4 in | |
| June | 66°F (19°C) | 0.1 in | Driest |
| July | 76°F (24°C) | 0.1 in | Warmest |
| August | 74°F (23°C) | 0.2 in | |
| September | 70°F (21°C) | 0.5 in | |
| October | 62°F (17°C) | 0.5 in | |
| November | 53°F (12°C) | 2.6 in | |
| December | 48°F (9°C) | 3.0 in | Coldest |
Altadena has a seasonal temperature swing of 28°F / from 48°F in December to 76°F in July. Total annual precipitation is 20.5 inches, with February being the wettest month (4.1") and June the driest (0.1").