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Rumsey, CA
Full City Profile · California · Napa County County
2.3
/5.0
C
Fair
113
Population
46/sq mi density
57°F
Avg Temperature
302 sunny days/yr
116
Violent Crime/100K
1,234 property/100K
C
Overall
2.3 / 5.0
Fair overall score based on economy, affordability, safety and education
F
Safety
1.0 / 5.0
116 violent crimes/100K
B+
Education
3.6 / 5.0
32.3% bachelor's degree or higher
Rumsey enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 47°F in January while summers reach 69°F in July. The area gets 302 sunny days per year. Annual precipitation totals 39.7 inches. Air quality is rated Good with a median AQI of 48.
Temperature
47°F Jan (8°C)
69°F Jul (21°C)
| Annual Average | 57.4°F |
| 6% above US avg | |
| January Average | 47°F (8°C) |
| July Average | 69°F (21°C) |
| Sunny Days | 302 days/yr |
Geography
| Elevation | 426 ft (130 m) |
| Area | 2.5 sq mi (6.3 km²) |
| Population Density | 46/sq mi |
| Coordinates | 38.8933°N, 122.2436°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
2 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 | 133 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 135 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
2 volcanoes within 200 km. Closest: Clear Lake (46 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 46 km |
| Lassen Volcanic Center | Stratovolcano | 3,187 m (10,456 ft) | 1917 | 189 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 47°F (8°C) | 5.7 in | Wettest |
| February | 48°F (9°C) | 4.4 in | |
| March | 51°F (10°C) | 3.6 in | |
| April | 56°F (13°C) | 1.6 in | |
| May | 63°F (17°C) | 0.4 in | |
| June | 71°F (22°C) | 0.2 in | |
| July | 69°F (21°C) | 0.0 in | Driest |
| August | 75°F (24°C) | 0.1 in | Warmest |
| September | 71°F (22°C) | 0.5 in | |
| October | 63°F (17°C) | 1.7 in | |
| November | 51°F (11°C) | 4.3 in | |
| December | 45°F (7°C) | 4.7 in | Coldest |
Rumsey has a seasonal temperature swing of 30°F / from 45°F in December to 75°F in August. Total annual precipitation is 27.1 inches, with January being the wettest month (5.7") and July the driest (0.0").