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Weather & Climate in Derby Acres, CA

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

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. The area gets 330 sunny days per year, well above the U.S. average of 205 / making it one of the sunnier locations in the country. Annual precipitation totals 6.0 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 48. The city sits at an elevation of 1,478 feet.

Temperature

50°F Jan (10°C) 83°F Jul (29°C)
Annual Average65.7°F
22% above US avg
January Average50°F (10°C)
July Average83°F (29°C)
Sunny Days330 days/yr

Geography

Elevation1,478 ft (450 m)
Area3.6 sq mi (9.3 km²)
Population Density94/sq mi
Coordinates35.2440°N, 119.6038°W
TimezoneAmerica/Los_Angeles
CountySan Luis Obispo County County
Nearest AirportSan Luis Obispo County Regional (SBP)
56 miles away

Precipitation & Snow

Annual Rainfall 6.0"
84% below US avg
Snowfall 0.2"
Wettest Month (Feb) 2.09"
Driest Month (Jun) 0.08"

Air Quality

AQI Median48.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively High
Risk Score95.9 / 100
Social Vulnerability32.8 / 100
Community Resilience93.9 / 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)

Earthquake History

4,252 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.0.

Sep 28, 2004 2004 Parkfield, California Earthquake M6.0 94 km 8 km
Jan 17, 1994 1km ENE of Granada Hills, California M5.9 148 km 5 km
Jul 11, 1992 12km NW of California City, California M5.7 140 km 10 km
Jan 17, 1994 7km NNE of Simi Valley, California M5.6 131 km 9 km
Jan 18, 1994 10km ESE of Piru, California M5.2 127 km 11 km
Aug 7, 2024 24 km SW of Lamont, CA M5.2 49 km 12 km
Jan 17, 1994 9km N of Chatsworth, California M5.2 135 km 5 km
May 28, 1993 21km SW of Lamont, California M5.2 47 km 21 km
Aug 20, 2023 7 km SE of Ojai, CA M5.1 100 km 5 km
Jan 19, 1994 10km SSW of Valencia, California M5.1 132 km 11 km
Apr 26, 1997 12km ESE of Piru, California M5.1 129 km 16 km
Jan 29, 1994 6km NNE of Chatsworth, California M5.1 140 km 1 km
Jan 19, 1994 8km ESE of Piru, California M5.1 126 km 14 km
Sep 29, 2004 25km SSW of Bodfish, California M5.0 90 km 3 km
Jun 26, 1995 11km SW of Valencia, California M5.0 127 km 13 km
Sep 29, 2004 8 km NW of Parkfield, California M5.0 113 km 11 km
Apr 27, 1997 11km SW of Valencia, California M4.9 130 km 15 km
Dec 20, 1994 3 km NW of Parkfield, California M4.9 108 km 8 km
Jan 17, 1994 3km N of Northridge, California M4.9 146 km 6 km
Sep 30, 2004 13 km NW of Parkfield, California M4.9 118 km 10 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Tornado History

22 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF1. Total: 3 injuries.

Date Rating Distance Path Fatalities
Feb 7, 2024 EF1 94 km 0.7 mi 0
Mar 17, 1991 EF1 17 km 0.1 mi 0
Jan 3, 1977 EF1 93 km 0.1 mi 0
Nov 1, 1964 EF1 71 km 1.0 mi 0
Mar 21, 2023 EF0 92 km 0.2 mi 0
Jun 2, 2019 EF0 77 km 0.2 mi 0
Feb 23, 2015 EF0 31 km 0.5 mi 0
Feb 27, 2010 EF0 31 km 0.5 mi 0
Jan 19, 2010 EF0 94 km 0.1 mi 0
Feb 2, 2004 EF0 95 km 0.5 mi 0
Nov 29, 2001 EF0 82 km 0.1 mi 0
Apr 3, 1999 EF0 59 km 0.1 mi 0
May 5, 1998 EF0 97 km 0.3 mi 0
Mar 22, 1997 EF0 50 km 0.2 mi 0
Feb 17, 1997 EF0 57 km 0.3 mi 0
Nov 22, 1996 EF0 71 km 2.0 mi 0
May 13, 1995 EF0 93 km 2.5 mi 0
Mar 24, 1994 EF0 91 km 0.1 mi 0
Feb 23, 1993 EF0 59 km 0.1 mi 0
Feb 19, 1993 EF0 95 km 0.1 mi 0
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).

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.

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).

Wildfire History

20 wildfires (100+ acres) recorded within 100 km. Largest: THOMAS (281,982 acres, 2017).

Year Name Acres Burned Distance
2017 THOMAS 281,982 92 km
2007 ZACA 241,846 61 km
2006 DAY 159,713 91 km
1985 WHEELER 2 126,854 85 km
1996 FIFTY-EIGHT 94,704 63 km
2009 LA BREA 84,213 52 km
1985 LAS PILITAS 75,841 82 km
1997 LOGAN 49,627 48 km
1994 41 48,441 99 km
1997 LOKERN 46,139 13 km
1993 MARRE 44,309 66 km
2016 REY 33,323 74 km
2017 ALAMO 29,256 70 km
2011 BRECKENRIDGE COMPLEX 27,229 84 km
2011 COMANCHE 25,965 78 km
1993 ORCHARD 22,309 70 km
1996 SKYLINE 21,694 93 km
2002 WOLF 21,097 81 km
2017 WHITTIER CA-LBOR-001770 18,510 85 km
2021 ALISAL 17,677 96 km
Source: NIFC/IRWIN Wildfire Records (100+ acres).

Monthly Weather

Month Avg Temperature Precipitation Summary
January 50°F (10°C) 1.9 in
February 51°F (10°C) 2.1 in Wettest
March 54°F (12°C) 2.0 in
April 58°F (15°C) 1.0 in
May 66°F (19°C) 0.3 in
June 74°F (24°C) 0.1 in
July 83°F (29°C) 0.0 in Warmest, Driest
August 79°F (26°C) 0.1 in
September 73°F (23°C) 0.3 in
October 65°F (18°C) 0.5 in
November 54°F (12°C) 1.4 in
December 46°F (8°C) 1.5 in Coldest

Derby Acres has a seasonal temperature swing of 37°F / from 46°F in December to 83°F in July. Total annual precipitation is 11.0 inches, with February being the wettest month (2.1") and July the driest (0.0").

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