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Rosemont, CA
Full City Profile · California · Sacramento County County
3.1
/5.0
B
Good
23,448
Population
5,341/sq mi density
$86,178
Median Income
$37,735 per capita
$436,400
Home Value
$459,020 Zillow
$1,719
Median Rent
33.3% income on rent
63°F
Avg Temperature
330 sunny days/yr
615
Violent Crime/100K
3,123 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
A
Economy
4.1 / 5.0
$86,178 median income, 4.2% unemployment
B+
Affordability
3.8 / 5.0
$436,400 home value, $1,719/mo rent
F
Safety
1.0 / 5.0
615 violent crimes/100K (62% above avg)
B
Education
3.4 / 5.0
30.1% bachelor's degree or higher
Rosemont enjoys a temperate climate with an average annual temperature of 63°F (17°C). Winters average 49°F in January while summers reach 78°F in July. The area gets 330 sunny days per year. Annual precipitation totals 19.2 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 (9°C)
78°F Jul (26°C)
| Annual Average | 63.4°F |
| 17% above US avg | |
| January Average | 49°F (9°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 59 ft (18 m) |
| Area | 4.4 sq mi (11.4 km²) |
| Population Density | 5,341/sq mi |
| Coordinates | 38.5477°N, 121.3554°W |
| Timezone | America/Los_Angeles |
| County | Sacramento County County |
| Nearest Airport | Sacramento International (SMF) 16 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0409 ppm |
| NO₂ (Nitrogen Dioxide) | 8.1 ppb |
| SO₂ (Sulfur Dioxide) | 0.17 ppb |
| CO (Carbon Monoxide) | 0.47 ppm |
| PM2.5 (Fine Particles) | 7.8 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.1 / 100 |
| Social Vulnerability | 37.4 / 100 |
| Community Resilience | 57.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very Low |
| Lightning | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | No Rating |
| Landslide | Relatively Low |
| Coastal Flood | No Rating |
| Volcano | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
3 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 | 115 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 143 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 138 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (131 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 131 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 49°F (9°C) | 3.9 in | Wettest |
| February | 52°F (11°C) | 3.3 in | |
| March | 55°F (13°C) | 2.8 in | |
| April | 60°F (16°C) | 1.2 in | |
| May | 67°F (19°C) | 0.4 in | |
| June | 73°F (23°C) | 0.2 in | |
| July | 78°F (26°C) | 0.1 in | Warmest, Driest |
| August | 76°F (24°C) | 0.1 in | |
| September | 73°F (23°C) | 0.4 in | |
| October | 65°F (18°C) | 1.1 in | |
| November | 54°F (12°C) | 2.8 in | |
| December | 47°F (8°C) | 2.6 in | Coldest |
Rosemont has a seasonal temperature swing of 31°F / from 47°F in December to 78°F in July. Total annual precipitation is 18.8 inches, with January being the wettest month (3.9") and July the driest (0.1").