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Fairfield, CA
Full City Profile · California · Napa County County
3.1
/5.0
B
Good
119,985
Population
2,885/sq mi density
$102,321
Median Income
$41,878 per capita
$592,500
Home Value
$603,445 Zillow
$2,191
Median Rent
36.3% income on rent
59°F
Avg Temperature
319 sunny days/yr
373
Violent Crime/100K
3,195 property/100K
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.7 / 5.0
$102,321 median income, 3.3% unemployment
B
Affordability
3.4 / 5.0
$592,500 home value, $2,191/mo rent
F
Safety
1.0 / 5.0
373 violent crimes/100K
B
Education
3.1 / 5.0
26.7% bachelor's degree or higher
Fairfield enjoys a temperate climate with an average annual temperature of 59°F (15°C). Winters average 48°F in January while summers reach 71°F in July. The area gets 319 sunny days per year. Annual precipitation totals 33.2 inches. The area receives 0.8 inches of snow annually. Air quality is rated Good with a median AQI of 48.
Temperature
48°F Jan (9°C)
71°F Jul (22°C)
| Annual Average | 58.6°F |
| 9% above US avg | |
| January Average | 48°F (9°C) |
| July Average | 71°F (22°C) |
| Sunny Days | 319 days/yr |
Geography
| Elevation | 39 ft (12 m) |
| Area | 41.6 sq mi (107.7 km²) |
| Population Density | 2,885/sq mi |
| Coordinates | 38.2621°N, 122.0324°W |
| Timezone | America/Los_Angeles |
| County | Napa County County |
| Nearest Airport | Sacramento International (SMF) 38 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.3 / 100 |
| Social Vulnerability | 38.5 / 100 |
| Community Resilience | 76.0 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Drought | Very High |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Relatively Moderate |
| Tsunami | Very 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 | 63 km |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 137 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 88 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 75 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | — | — | 119 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (102 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 102 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 48°F (9°C) | 5.4 in | Wettest |
| February | 51°F (11°C) | 4.5 in | |
| March | 54°F (12°C) | 3.5 in | |
| April | 58°F (15°C) | 1.2 in | |
| May | 64°F (18°C) | 0.6 in | |
| June | 69°F (21°C) | 0.1 in | |
| July | 71°F (22°C) | 0.0 in | Driest |
| August | 72°F (22°C) | 0.1 in | Warmest |
| September | 70°F (21°C) | 0.3 in | |
| October | 64°F (18°C) | 1.3 in | |
| November | 54°F (12°C) | 3.4 in | |
| December | 47°F (8°C) | 3.7 in | Coldest |
Fairfield has a seasonal temperature swing of 25°F / from 47°F in December to 72°F in August. Total annual precipitation is 24.1 inches, with January being the wettest month (5.4") and July the driest (0.0").