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St. Helena, CA
Full City Profile · California · Napa County County
3.0
/5.0
B
Good
5,378
Population
1,084/sq mi density
$158,218
Median Income
$108,577 per capita
$1,964,300
Home Value
$931,177 Zillow
$2,391
Median Rent
31.5% income on rent
61°F
Avg Temperature
302 sunny days/yr
194
Violent Crime/100K
1,082 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$158,218 median income, 2.7% unemployment
F
Affordability
1.0 / 5.0
$1,964,300 home value, $2,391/mo rent
F
Safety
1.0 / 5.0
194 violent crimes/100K
A+
Education
5.0 / 5.0
58.3% bachelor's degree or higher
St. Helena enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 50°F in January while summers reach 72°F in July. The area gets 302 sunny days per year. Annual precipitation totals 34.0 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 48.
Temperature
50°F Jan (10°C)
72°F Jul (22°C)
| Annual Average | 61.0°F |
| 13% above US avg | |
| January Average | 50°F (10°C) |
| July Average | 72°F (22°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 222 ft (68 m) |
| Area | 5.0 sq mi (12.8 km²) |
| Population Density | 1,084/sq mi |
| Coordinates | 38.5128°N, 122.4681°W |
| Timezone | America/Los_Angeles |
| County | Napa County County |
| Nearest Airport | Sacramento International (SMF) 49 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
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 | 96 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 114 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 90 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (57 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 57 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 50°F (10°C) | 7.5 in | Wettest |
| February | 49°F (9°C) | 5.8 in | |
| March | 51°F (11°C) | 4.7 in | |
| April | 55°F (13°C) | 1.9 in | |
| May | 62°F (16°C) | 0.6 in | |
| June | 68°F (20°C) | 0.2 in | |
| July | 72°F (22°C) | 0.0 in | Warmest, Driest |
| August | 72°F (22°C) | 0.1 in | |
| September | 68°F (20°C) | 0.5 in | |
| October | 62°F (16°C) | 1.9 in | |
| November | 52°F (11°C) | 5.0 in | |
| December | 46°F (8°C) | 5.7 in | Coldest |
St. Helena has a seasonal temperature swing of 27°F / from 46°F in December to 72°F in July. Total annual precipitation is 34.0 inches, with January being the wettest month (7.5") and July the driest (0.0").