Rossmoor, CA
Full City Profile · California · Orange County County
4.3
/5.0
A
Great
11,895
Population
7,625/sq mi density
$200,833
Median Income
$86,963 per capita
$1,234,700
Home Value
$1,542,058 Zillow
$3,501
Median Rent
24.6% income on rent
65°F
Avg Temperature
A
Overall
4.3 / 5.0
Strong
A+
Economy
4.7 / 5.0
$200,833 median income, 4.3% unemployment
B
Affordability
3.2 / 5.0
$1,234,700 home value, $3,501/mo rent
A+
Education
5.0 / 5.0
60.7% bachelor's degree or higher
Rossmoor enjoys a temperate climate with an average annual temperature of 65°F (18°C). Winters average 57°F in January while summers reach 73°F in July. Annual precipitation totals 12.0 inches. The area receives 0.0 inches of snow annually. Air quality is rated Moderate with a median AQI of 54.
Temperature
57°F Jan (14°C)
73°F Jul (23°C)
| Annual Average | 64.9°F |
| 20% above US avg | |
| January Average | 57°F (14°C) |
| July Average | 73°F (23°C) |
Geography
| Elevation | 15 ft (5 m) |
| Area | 1.6 sq mi (4.0 km²) |
| Population Density | 7,625/sq mi |
| Coordinates | 33.7887°N, 118.0803°W |
| Timezone | America/Los_Angeles |
| County | Orange County County |
| Nearest Airport | John Wayne/Orange County (SNA) 14 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 54.0 |
| Rating | Moderate |
| Good Days % | 32.5% |
| Unhealthy Days | 16 |
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
4 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 | 58 km |
| 1862 | S. CALIFORNIA | Eruption + Earthquake | 1.2 m | - | 146 km |
| 1994 | WEST COAST, USA | Earthquake | 0.1 m | 57 | 63 km |
| 1855 | S. CALIFORNIA | Eruption + Earthquake | - | - | 35 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 57°F (14°C) | 2.9 in | |
| February | 58°F (14°C) | 3.0 in | Wettest |
| March | 60°F (16°C) | 1.7 in | |
| April | 63°F (17°C) | 0.6 in | |
| May | 66°F (19°C) | 0.3 in | |
| June | 69°F (20°C) | 0.1 in | |
| July | 73°F (23°C) | 0.1 in | |
| August | 74°F (24°C) | 0.0 in | Warmest, Driest |
| September | 73°F (23°C) | 0.1 in | |
| October | 68°F (20°C) | 0.5 in | |
| November | 62°F (17°C) | 0.8 in | |
| December | 57°F (14°C) | 2.2 in | Coldest |
Rossmoor has a seasonal temperature swing of 18°F / from 57°F in December to 74°F in August. Total annual precipitation is 12.0 inches, with February being the wettest month (3.0") and August the driest (0.0").