Derby Acres, CA
Full City Profile · California · San Luis Obispo County County
2.5
/5.0
C+
Fair
335
Population
94/sq mi density
$45,893
Median Income
$18,969 per capita
$189,200
Home Value
$201,442 Zillow
$1,143
Median Rent
31.4% income on rent
66°F
Avg Temperature
C+
Overall
2.5 / 5.0
Fair overall score based on economy, affordability, safety and education
D
Economy
1.8 / 5.0
$45,893 median income, 21.7% unemployment
A
Affordability
4.4 / 5.0
$189,200 home value, $1,143/mo rent
F
Education
1.3 / 5.0
3.8% bachelor's degree or higher
Derby Acres enjoys a temperate climate with an average annual temperature of 66°F (19°C). Winters average 50°F in January while summers reach 83°F in July. Annual precipitation totals 6.0 inches. The area receives 0.2 inches of snow annually. Air quality is rated Good with a median AQI of 49.
Temperature
50°F Jan (10°C)
83°F Jul (29°C)
| Annual Average | 65.7°F |
| 22% above US avg | |
| January Average | 50°F (10°C) |
| July Average | 83°F (29°C) |
Geography
| Elevation | 1,478 ft (450 m) |
| Area | 3.6 sq mi (9.3 km²) |
| Population Density | 94/sq mi |
| Coordinates | 35.2440°N, 119.6038°W |
| Timezone | America/Los_Angeles |
| County | San Luis Obispo County County |
| Nearest Airport | San Luis Obispo County Regional (SBP) 56 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 49.0 |
| Rating | Good |
| Good Days % | 52.7% |
| Unhealthy Days | 10 |
Air Pollutants (EPA 2023)
| Ozone (O₃) | 0.0404 ppm |
| NO₂ (Nitrogen Dioxide) | 5.1 ppb |
| SO₂ (Sulfur Dioxide) | 0.39 ppb |
| PM2.5 (Fine Particles) | 4.9 μg/m³ |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 95.9 / 100 |
| Social Vulnerability | 32.8 / 100 |
| Community Resilience | 93.9 / 100 |
Hazard Breakdown
| Tornado | Very Low |
| Earthquake | Relatively Moderate |
| Wildfire | Relatively High |
| 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 Low |
| Tsunami | Relatively Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Tsunami History
4 tsunamis recorded within 500 km. Highest wave on record: 3.4 m (11 ft).
| Year | Location | Cause | Max Wave | Deaths | Distance |
| 1812 | S. CALIFORNIA | Eruption + Earthquake | 3.4 m | 1 | 119 km |
| 1927 | S. CALIFORNIA | Earthquake | 1.8 m | - | 117 km |
| 1878 | S. CALIFORNIA | Meteorological | 1.0 m | 1 | 103 km |
| 1901 | MONTEREY BAY, N. CALIFORNIA | Eruption + Earthquake | - | - | 117 km |
Source: NOAA/NCEI Historical Tsunami Database. Sorted by wave height.
Nearby Volcanoes
1 volcano within 200 km. Closest: Golden Trout Creek (170 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Golden Trout Creek | Volcanic field | 2,886 m (9,469 ft) | -5550 | 170 km |
Source: Smithsonian Institution Global Volcanism Program (GVP). Sorted by distance.
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 50°F (10°C) | 1.1 in | |
| February | 53°F (12°C) | 1.2 in | Wettest |
| March | 59°F (15°C) | 1.0 in | |
| April | 63°F (17°C) | 0.6 in | |
| May | 70°F (21°C) | 0.4 in | |
| June | 76°F (25°C) | 0.0 in | |
| July | 83°F (29°C) | 0.0 in | Warmest |
| August | 82°F (28°C) | 0.0 in | Driest |
| September | 77°F (25°C) | 0.1 in | |
| October | 68°F (20°C) | 0.3 in | |
| November | 57°F (14°C) | 0.4 in | |
| December | 50°F (10°C) | 0.9 in | Coldest |
Derby Acres has a seasonal temperature swing of 34°F / from 50°F in December to 83°F in July. Total annual precipitation is 6.0 inches, with February being the wettest month (1.2") and August the driest (0.0").