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Penngrove, CA
Full City Profile · California · Marin County County
3.0
/5.0
B
Good
2,123
Population
527/sq mi density
$115,826
Median Income
$76,963 per capita
$1,193,100
Home Value
$1,232,926 Zillow
$2,454
Median Rent
31.3% income on rent
58°F
Avg Temperature
326 sunny days/yr
445
Violent Crime/100K
943 property/100K
B
Overall
3.0 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.8 / 5.0
$115,826 median income, 3.5% unemployment
F
Affordability
1.0 / 5.0
$1,193,100 home value, $2,454/mo rent
F
Safety
1.0 / 5.0
445 violent crimes/100K (17% above avg)
A+
Education
5.0 / 5.0
53.9% bachelor's degree or higher
Penngrove enjoys a temperate climate with an average annual temperature of 58°F (14°C). Winters average 48°F in January while summers reach 67°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
48°F Jan (9°C)
67°F Jul (19°C)
| Annual Average | 58.0°F |
| 7% above US avg | |
| January Average | 48°F (9°C) |
| July Average | 67°F (19°C) |
| Sunny Days | 326 days/yr |
Geography
| Elevation | 102 ft (31 m) |
| Area | 4.0 sq mi (10.4 km²) |
| Population Density | 527/sq mi |
| Coordinates | 38.3006°N, 122.6706°W |
| Timezone | America/Los_Angeles |
| County | Marin County County |
| Nearest Airport | Metro Oakland International (OAK) 47 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0326 ppm |
| NO₂ (Nitrogen Dioxide) | 9.1 ppb |
| CO (Carbon Monoxide) | 0.31 ppm |
| PM2.5 (Fine Particles) | 5.4 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 96.4 / 100 |
| Social Vulnerability | 24.7 / 100 |
| Community Resilience | 99.2 / 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 | Relatively Low |
| Cold Wave | No Rating |
| Landslide | Relatively High |
| Coastal Flood | Very High |
| Tsunami | Relatively Moderate |
| Volcano | 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 | 83 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 95 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 68 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | — | — | 140 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (75 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 75 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 48°F (9°C) | 7.5 in | Wettest |
| February | 51°F (11°C) | 6.4 in | |
| March | 53°F (12°C) | 5.2 in | |
| April | 55°F (13°C) | 1.9 in | |
| May | 59°F (15°C) | 0.8 in | |
| June | 63°F (17°C) | 0.2 in | |
| July | 67°F (19°C) | 0.1 in | Driest |
| August | 67°F (19°C) | 0.1 in | Warmest |
| September | 66°F (19°C) | 0.5 in | |
| October | 62°F (16°C) | 2.1 in | |
| November | 53°F (12°C) | 5.3 in | |
| December | 48°F (9°C) | 5.8 in | Coldest |
Penngrove has a seasonal temperature swing of 19°F / from 48°F in December to 67°F in August. Total annual precipitation is 35.7 inches, with January being the wettest month (7.5") and July the driest (0.1").