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Thornton, CA
Full City Profile · California · Sacramento County County
1.7
/5.0
D
Poor
815
Population
383/sq mi density
$47,917
Median Income
$21,243 per capita
$455,300
Home Value
$466,769 Zillow
$898
Median Rent
29.2% income on rent
62°F
Avg Temperature
330 sunny days/yr
284
Violent Crime/100K
2,327 property/100K
D
Overall
1.7 / 5.0
Below average overall score based on economy, affordability, safety and education
C+
Economy
2.5 / 5.0
$47,917 median income, 6.3% unemployment
F
Affordability
1.3 / 5.0
$455,300 home value, $898/mo rent
F
Safety
1.0 / 5.0
284 violent crimes/100K
D
Education
1.9 / 5.0
11.0% bachelor's degree or higher
Thornton enjoys a temperate climate with an average annual temperature of 62°F (17°C). Winters average 48°F in January while summers reach 76°F in July. The area gets 330 sunny days per year. Annual precipitation totals 18.4 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 48.
Temperature
48°F Jan (9°C)
76°F Jul (24°C)
| Annual Average | 62.2°F |
| 15% above US avg | |
| January Average | 48°F (9°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 10 ft (3 m) |
| Area | 2.2 sq mi (5.6 km²) |
| Population Density | 383/sq mi |
| Coordinates | 38.2297°N, 121.4261°W |
| Timezone | America/Los_Angeles |
| County | Sacramento County County |
| Nearest Airport | Sacramento International (SMF) 33 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
5 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 | 83 km |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 139 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 112 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 111 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | — | — | 122 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (143 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 143 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 48°F (9°C) | 3.6 in | Wettest |
| February | 51°F (10°C) | 3.2 in | |
| March | 54°F (12°C) | 2.7 in | |
| April | 59°F (15°C) | 0.9 in | |
| May | 65°F (18°C) | 0.5 in | |
| June | 70°F (21°C) | 0.1 in | |
| July | 76°F (24°C) | 0.0 in | Warmest, Driest |
| August | 72°F (22°C) | 0.1 in | |
| September | 70°F (21°C) | 0.3 in | |
| October | 63°F (17°C) | 0.9 in | |
| November | 52°F (11°C) | 2.4 in | |
| December | 45°F (7°C) | 2.5 in | Coldest |
Thornton has a seasonal temperature swing of 31°F / from 45°F in December to 76°F in July. Total annual precipitation is 17.2 inches, with January being the wettest month (3.6") and July the driest (0.0").