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Weather & Climate in Stevenson Ranch, CA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Stevenson Ranch enjoys a temperate climate with an average annual temperature of 66°F (19°C). Winters average 55°F in January while summers reach 79°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 16.8 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 1,577 feet.
Temperature
55°F Jan (13°C)
79°F Jul (26°C)
| Annual Average | 65.5°F |
| 21% above US avg | |
| January Average | 55°F (13°C) |
| July Average | 79°F (26°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 1,577 ft (481 m) |
| Area | 6.4 sq mi (16.5 km²) |
| Population Density | 3,341/sq mi |
| Coordinates | 34.3877°N, 118.5844°W |
| Timezone | America/Los_Angeles |
| County | Los Angeles County County |
| Nearest Airport | Bob Hope (BUR) 18 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Very High |
| Risk Score | 100.0 / 100 |
| Social Vulnerability | 55.4 / 100 |
| Community Resilience | 13.6 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | No Rating |
| Earthquake | Very High |
| Wildfire | Very High |
| Flood | Very High |
| Hail | Relatively Moderate |
| Strong Wind | Relatively Moderate |
| Heat Wave | Relatively High |
| Winter Weather | Relatively Moderate |
| Lightning | Very High |
| Drought | Relatively Low |
| Cold Wave | Very Low |
| Landslide | Relatively High |
| Coastal Flood | Relatively High |
| Tsunami | Relatively Low |
| Avalanche | Relatively High |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
4,461 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.7.
| Jan 17, 1994 | Northridge, California, earthquake | M6.7 | 20 km | 18 km |
| Jan 17, 1994 | 1km ENE of Granada Hills, California | M5.9 | 15 km | 5 km |
| Jun 28, 1991 | The 1991 Sierra Madre, California Earthquake | M5.8 | 56 km | 8 km |
| Jul 11, 1992 | 12km NW of California City, California | M5.7 | 103 km | 10 km |
| Oct 16, 1999 | 7km ENE of Running Springs, CA | M5.6 | 143 km | 6 km |
| Jan 17, 1994 | 7km NNE of Simi Valley, California | M5.6 | 13 km | 9 km |
| Feb 28, 1990 | The 1990 Upland, California Earthquake | M5.5 | 86 km | 3 km |
| Apr 5, 2018 | 31km SW of Santa Cruz Is. (E end), CA | M5.3 | 123 km | 10 km |
| Mar 20, 1994 | 3km WNW of Panorama City, California | M5.2 | 20 km | 12 km |
| Jan 18, 1994 | 10km ESE of Piru, California | M5.2 | 11 km | 11 km |
| Aug 7, 2024 | 24 km SW of Lamont, CA | M5.2 | 93 km | 12 km |
| Jan 17, 1994 | 9km N of Chatsworth, California | M5.2 | 6 km | 5 km |
| May 28, 1993 | 21km SW of Lamont, California | M5.2 | 97 km | 21 km |
| Mar 29, 2014 | 2km NW of Brea, CA | M5.1 | 80 km | 5 km |
| Aug 20, 2023 | 7 km SE of Ojai, CA | M5.1 | 56 km | 5 km |
| Jan 19, 1994 | 10km SSW of Valencia, California | M5.1 | 3 km | 11 km |
| Apr 26, 1997 | 12km ESE of Piru, California | M5.1 | 8 km | 16 km |
| Jan 29, 1994 | 6km NNE of Chatsworth, California | M5.1 | 9 km | 1 km |
| Jan 19, 1994 | 8km ESE of Piru, California | M5.1 | 12 km | 14 km |
| Sep 29, 2004 | 25km SSW of Bodfish, California | M5.0 | 112 km | 3 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
81 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 51 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 1, 1983 | EF2 | 49 km | 3.5 mi | 0 |
| Nov 9, 1982 | EF2 | 26 km | 1.0 mi | 0 |
| Nov 9, 1982 | EF2 | 76 km | 10.0 mi | 0 |
| Nov 7, 1966 | EF2 | 60 km | 0.1 mi | 0 |
| Nov 7, 1966 | EF2 | 64 km | 10.3 mi | 0 |
| Mar 22, 2023 | EF1 | 61 km | 0.5 mi | 0 |
| Jan 19, 2010 | EF1 | 86 km | 4.6 mi | 0 |
| Jan 9, 1998 | EF1 | 78 km | 1.5 mi | 0 |
| Dec 21, 1997 | EF1 | 96 km | 1.0 mi | 0 |
| Jan 14, 1993 | EF1 | 81 km | 1.0 mi | 0 |
| Dec 7, 1992 | EF1 | 89 km | 0.1 mi | 0 |
| Dec 7, 1992 | EF1 | 87 km | 0.1 mi | 0 |
| Mar 20, 1992 | EF1 | 49 km | 0.2 mi | 0 |
| Mar 27, 1991 | EF1 | 96 km | 3.0 mi | 0 |
| Mar 16, 1986 | EF1 | 87 km | 1.2 mi | 0 |
| Oct 1, 1983 | EF1 | 56 km | 0.3 mi | 0 |
| Nov 9, 1982 | EF1 | 41 km | 0.2 mi | 0 |
| Mar 29, 1982 | EF1 | 56 km | 2.0 mi | 0 |
| Jan 31, 1979 | EF1 | 31 km | 0.1 mi | 0 |
| Jan 31, 1979 | EF1 | 96 km | 2.0 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 | 123 km |
| 1930 | S. CALIFORNIA | Eruption + Earthquake | 3.1 m | 1 | 40 km |
| 1994 | WEST COAST, USA | Earthquake | 0.1 m | 57 | 20 km |
| 1855 | S. CALIFORNIA | Eruption + Earthquake | - | - | 55 km |
Source: NOAA/NCEI Historical Tsunami Database.
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 | 66 km |
| 2009 | STATION | 165,368 | 42 km |
| 2006 | DAY | 159,713 | 44 km |
| 1985 | WHEELER 2 | 126,854 | 72 km |
| 2020 | BOBCAT | 115,728 | 60 km |
| 2003 | SIMI | 107,756 | 20 km |
| 2018 | WOOLSEY | 97,962 | 37 km |
| 2003 | PIRU | 63,920 | 27 km |
| 1985 | FERNDALE | 46,724 | 52 km |
| 2016 | SAND | 41,561 | 22 km |
| 2007 | BUCKWEED | 41,332 | 19 km |
| 1993 | GREEN MEADOWS | 38,115 | 47 km |
| 2002 | WILLIAMS | 37,505 | 77 km |
| 2007 | RANCH | 37,009 | 19 km |
| 2016 | BLUE CUT | 36,856 | 99 km |
| 2013 | POWERHOUSE | 32,329 | 33 km |
| 2020 | LAKE | 30,971 | 33 km |
| 2008 | FREEWAY COMPLEX | 29,350 | 93 km |
| 1993 | STECKEL | 26,202 | 52 km |
| 2011 | COMANCHE | 25,965 | 83 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 55°F (13°C) | 3.2 in | |
| February | 53°F (12°C) | 3.3 in | Wettest |
| March | 55°F (13°C) | 2.4 in | |
| April | 59°F (15°C) | 1.1 in | |
| May | 64°F (18°C) | 0.2 in | |
| June | 70°F (21°C) | 0.0 in | Driest |
| July | 79°F (26°C) | 0.0 in | Warmest |
| August | 77°F (25°C) | 0.1 in | |
| September | 73°F (23°C) | 0.2 in | |
| October | 67°F (19°C) | 0.4 in | |
| November | 57°F (14°C) | 2.4 in | |
| December | 52°F (11°C) | 2.2 in | Coldest |
Stevenson Ranch has a seasonal temperature swing of 27°F / from 52°F in December to 79°F in July. Total annual precipitation is 15.6 inches, with February being the wettest month (3.3") and June the driest (0.0").