All Countries
Antioch, CA
Full City Profile · California · Contra Costa County County
2.8
/5.0
C+
Fair
115,759
Population
3,968/sq mi density
$94,256
Median Income
$40,337 per capita
$607,400
Home Value
$587,936 Zillow
$2,241
Median Rent
36.9% income on rent
60°F
Avg Temperature
322 sunny days/yr
575
Violent Crime/100K
2,840 property/100K
C+
Overall
2.8 / 5.0
Fair overall score based on economy, affordability, safety and education
A
Economy
4.3 / 5.0
$94,256 median income, 4.6% unemployment
B
Affordability
3.0 / 5.0
$607,400 home value, $2,241/mo rent
F
Safety
1.0 / 5.0
575 violent crimes/100K (51% above avg)
C+
Education
2.9 / 5.0
23.9% bachelor's degree or higher
Antioch enjoys a temperate climate with an average annual temperature of 60°F (16°C). Winters average 48°F in January while summers reach 75°F in July. The area gets 322 sunny days per year. Annual precipitation totals 31.2 inches. The area receives 1.7 inches of snow annually. Air quality is rated Good with a median AQI of 48.
Temperature
48°F Jan (9°C)
75°F Jul (24°C)
| Annual Average | 59.8°F |
| 11% above US avg | |
| January Average | 48°F (9°C) |
| July Average | 75°F (24°C) |
| Sunny Days | 322 days/yr |
Geography
| Elevation | 226 ft (69 m) |
| Area | 29.1 sq mi (75.3 km²) |
| Population Density | 3,968/sq mi |
| Coordinates | 37.9783°N, 121.7961°W |
| Timezone | America/Los_Angeles |
| County | Contra Costa County County |
| Nearest Airport | Metro Oakland International (OAK) 29 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0361 ppm |
| NO₂ (Nitrogen Dioxide) | 7.4 ppb |
| SO₂ (Sulfur Dioxide) | 1.19 ppb |
| CO (Carbon Monoxide) | 0.29 ppm |
| PM2.5 (Fine Particles) | 7.6 μg/m³ |
Natural Hazard Risk
| Overall Risk | Very High |
| Risk Score | 99.5 / 100 |
| Social Vulnerability | 21.5 / 100 |
| Community Resilience | 67.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Very High |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively High |
| Winter Weather | Very Low |
| Lightning | Relatively High |
| Drought | Relatively High |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Relatively Moderate |
| Tsunami | Relatively Low |
| Volcano | Very Low |
| Avalanche | 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 | 41 km |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 105 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 69 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 69 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | — | — | 87 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (139 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 139 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 48°F (9°C) | 3.2 in | Wettest |
| February | 51°F (11°C) | 2.6 in | |
| March | 54°F (12°C) | 2.1 in | |
| April | 58°F (15°C) | 1.0 in | |
| May | 64°F (18°C) | 0.4 in | |
| June | 70°F (21°C) | 0.1 in | |
| July | 75°F (24°C) | 0.0 in | Warmest, Driest |
| August | 74°F (23°C) | 0.1 in | |
| September | 71°F (22°C) | 0.2 in | |
| October | 65°F (18°C) | 0.9 in | |
| November | 54°F (12°C) | 2.2 in | |
| December | 47°F (8°C) | 2.3 in | Coldest |
Antioch has a seasonal temperature swing of 28°F / from 47°F in December to 75°F in July. Total annual precipitation is 15.2 inches, with January being the wettest month (3.2") and July the driest (0.0").