Rumsey, CA
Full City Profile · California · Napa County County
3.6
/5.0
B+
Good
113
Population
46/sq mi density
57°F
Avg Temperature
B+
Overall
3.6 / 5.0
Good overall score based on economy, affordability, safety and education
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 44°F in January while summers reach 74°F in July. Annual precipitation totals 29.9 inches. The area receives 0.4 inches of snow annually.
Temperature
44°F Jan (7°C)
74°F Jul (23°C)
| Annual Average | 56.9°F |
| 5% above US avg | |
| January Average | 44°F (7°C) |
| July Average | 74°F (23°C) |
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
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 | 44°F (7°C) | 6.2 in | Coldest, Wettest |
| February | 46°F (8°C) | 6.2 in | |
| March | 49°F (9°C) | 4.0 in | |
| April | 53°F (12°C) | 2.0 in | |
| May | 59°F (15°C) | 1.2 in | |
| June | 67°F (20°C) | 0.2 in | |
| July | 74°F (23°C) | 0.0 in | Warmest, Driest |
| August | 72°F (22°C) | 0.1 in | |
| September | 68°F (20°C) | 0.2 in | |
| October | 59°F (15°C) | 0.9 in | |
| November | 50°F (10°C) | 2.9 in | |
| December | 44°F (7°C) | 6.1 in |
Rumsey has a seasonal temperature swing of 30°F / from 44°F in January to 74°F in July. Total annual precipitation is 29.9 inches, with January being the wettest month (6.2") and July the driest (0.0").