Day Valley, CA
Full City Profile · California · Santa Clara County County
3.9
/5.0
B+
Good
3,514
Population
190/sq mi density
$150,256
Median Income
$62,813 per capita
$1,187,200
Home Value
$1,313,194 Zillow
$1,362
Median Rent
13.9% income on rent
57°F
Avg Temperature
B+
Overall
3.9 / 5.0
Good overall score based on economy, affordability, safety and education
A+
Economy
4.6 / 5.0
$150,256 median income, 4.5% unemployment
C
Affordability
2.2 / 5.0
$1,187,200 home value, $1,362/mo rent
A+
Education
4.9 / 5.0
48.5% bachelor's degree or higher
Day Valley enjoys a temperate climate with an average annual temperature of 57°F (14°C). Winters average 51°F in January while summers reach 63°F in July. Annual precipitation totals 22.4 inches. The area receives 0.0 inches of snow annually. Air quality is rated Good with a median AQI of 47.
Temperature
51°F Jan (10°C)
63°F Jul (17°C)
| Annual Average | 57.2°F |
| 6% above US avg | |
| January Average | 51°F (10°C) |
| July Average | 63°F (17°C) |
Geography
| Elevation | 963 ft (294 m) |
| Area | 18.5 sq mi (47.9 km²) |
| Population Density | 190/sq mi |
| Coordinates | 37.0254°N, 121.8559°W |
| Timezone | America/Los_Angeles |
| County | Santa Clara County County |
| Nearest Airport | Norman Y Mineta San Jose International (SJC) 24 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 47.0 |
| Rating | Good |
| Good Days % | 55.4% |
| Unhealthy Days | 1 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0372 ppm |
| NO₂ (Nitrogen Dioxide) | 15.5 ppb |
| SO₂ (Sulfur Dioxide) | 0.16 ppb |
| CO (Carbon Monoxide) | 0.39 ppm |
| PM2.5 (Fine Particles) | 6.9 μg/m³ |
Natural Hazard Risk
| Overall Risk | Very High |
| Risk Score | 99.8 / 100 |
| Social Vulnerability | 17.2 / 100 |
| Community Resilience | 72.6 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Very High |
| Wildfire | Relatively Moderate |
| Flood | Very High |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively High |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| 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
5 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 | 78 km |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 3 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | - | 66 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | - | 94 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | - | - | 20 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 51°F (10°C) | 4.6 in | Wettest |
| February | 52°F (11°C) | 4.0 in | |
| March | 54°F (12°C) | 4.3 in | |
| April | 56°F (13°C) | 1.3 in | |
| May | 58°F (15°C) | 0.9 in | |
| June | 61°F (16°C) | 0.2 in | |
| July | 63°F (17°C) | 0.0 in | Driest |
| August | 63°F (17°C) | 0.0 in | |
| September | 64°F (18°C) | 0.1 in | Warmest |
| October | 61°F (16°C) | 0.9 in | |
| November | 55°F (13°C) | 2.1 in | |
| December | 50°F (10°C) | 4.0 in | Coldest |
Day Valley has a seasonal temperature swing of 14°F / from 50°F in December to 64°F in September. Total annual precipitation is 22.4 inches, with January being the wettest month (4.6") and July the driest (0.0").