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Hartley, CA
Full City Profile · California · Solano County County
2.9
/5.0
C+
Fair
1,966
Population
304/sq mi density
$120,354
Median Income
$60,227 per capita
$864,100
Home Value
$603,548 Zillow
$1,115
Median Rent
31.5% income on rent
64°F
Avg Temperature
326 sunny days/yr
283
Violent Crime/100K
2,732 property/100K
C+
Overall
2.9 / 5.0
Fair overall score based on economy, affordability, safety and education
A+
Economy
5.0 / 5.0
$120,354 median income, 0.1% unemployment
C+
Affordability
2.6 / 5.0
$864,100 home value, $1,115/mo rent
F
Safety
1.0 / 5.0
283 violent crimes/100K
C+
Education
2.9 / 5.0
24.0% bachelor's degree or higher
Hartley enjoys a temperate climate with an average annual temperature of 64°F (18°C). Winters average 49°F in January while summers reach 79°F in July. The area gets 326 sunny days per year. Annual precipitation totals 25.6 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)
79°F Jul (26°C)
| Annual Average | 63.6°F |
| 18% above US avg | |
| January Average | 49°F (9°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 326 days/yr |
Geography
| Elevation | 130 ft (40 m) |
| Area | 6.5 sq mi (16.8 km²) |
| Population Density | 304/sq mi |
| Coordinates | 38.4204°N, 121.9508°W |
| Timezone | America/Los_Angeles |
| County | Solano County County |
| Nearest Airport | Sacramento International (SMF) 27 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0361 ppm |
| NO₂ (Nitrogen Dioxide) | 9.0 ppb |
| SO₂ (Sulfur Dioxide) | 0.34 ppb |
| CO (Carbon Monoxide) | 0.39 ppm |
| PM2.5 (Fine Particles) | 6.2 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 97.0 / 100 |
| Social Vulnerability | 25.2 / 100 |
| Community Resilience | 71.8 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Very Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Relatively High |
| Tsunami | Very Low |
| Volcano | Very 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: 4.5 m (15 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1868 | N. CALIFORNIA | Eruption + Earthquake | 4.5 m | 30 | 81 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 107 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 93 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | — | — | 136 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (94 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 94 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 49°F (9°C) | 5.1 in | Wettest |
| February | 51°F (10°C) | 4.3 in | |
| March | 55°F (13°C) | 3.3 in | |
| April | 59°F (15°C) | 1.0 in | |
| May | 66°F (19°C) | 0.5 in | |
| June | 72°F (22°C) | 0.1 in | |
| July | 79°F (26°C) | 0.0 in | Warmest, Driest |
| August | 74°F (23°C) | 0.0 in | |
| September | 71°F (22°C) | 0.3 in | |
| October | 64°F (18°C) | 1.1 in | |
| November | 53°F (12°C) | 3.0 in | |
| December | 46°F (8°C) | 3.4 in | Coldest |
Hartley has a seasonal temperature swing of 33°F / from 46°F in December to 79°F in July. Total annual precipitation is 22.2 inches, with January being the wettest month (5.1") and July the driest (0.0").