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Weather & Climate in Santa Rosa Valley, CA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Santa Rosa Valley enjoys a temperate climate with an average annual temperature of 66°F (19°C). Winters average 56°F in January while summers reach 78°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 16.4 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 436 feet.
Temperature
56°F Jan (14°C)
78°F Jul (26°C)
| Annual Average | 66.3°F |
| 23% above US avg | |
| January Average | 56°F (14°C) |
| July Average | 78°F (26°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 436 ft (133 m) |
| Area | 6.9 sq mi (17.8 km²) |
| Population Density | 378/sq mi |
| Coordinates | 34.2459°N, 118.9018°W |
| Timezone | America/Los_Angeles |
| County | Los Angeles County County |
| Nearest Airport | Bob Hope (BUR) 31 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
3,867 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.7.
| Jan 17, 1994 | Northridge, California, earthquake | M6.7 | 34 km | 18 km |
| Jan 17, 1994 | 1km ENE of Granada Hills, California | M5.9 | 38 km | 5 km |
| Jun 28, 1991 | The 1991 Sierra Madre, California Earthquake | M5.8 | 84 km | 8 km |
| Jul 11, 1992 | 12km NW of California City, California | M5.7 | 132 km | 10 km |
| Jan 17, 1994 | 7km NNE of Simi Valley, California | M5.6 | 21 km | 9 km |
| Feb 28, 1990 | The 1990 Upland, California Earthquake | M5.5 | 111 km | 3 km |
| Apr 5, 2018 | 31km SW of Santa Cruz Is. (E end), CA | M5.3 | 90 km | 10 km |
| Jan 18, 1994 | 10km ESE of Piru, California | M5.2 | 24 km | 11 km |
| Mar 20, 1994 | 3km WNW of Panorama City, California | M5.2 | 39 km | 12 km |
| Aug 7, 2024 | 24 km SW of Lamont, CA | M5.2 | 98 km | 12 km |
| Jan 17, 1994 | 9km N of Chatsworth, California | M5.2 | 28 km | 5 km |
| May 28, 1993 | 21km SW of Lamont, California | M5.2 | 102 km | 21 km |
| Mar 29, 2014 | 2km NW of Brea, CA | M5.1 | 97 km | 5 km |
| Aug 20, 2023 | 7 km SE of Ojai, CA | M5.1 | 32 km | 5 km |
| Apr 26, 1997 | 12km ESE of Piru, California | M5.1 | 25 km | 16 km |
| Jan 19, 1994 | 10km SSW of Valencia, California | M5.1 | 30 km | 11 km |
| Jan 19, 1994 | 8km ESE of Piru, California | M5.1 | 23 km | 14 km |
| Jan 29, 1994 | 6km NNE of Chatsworth, California | M5.1 | 30 km | 1 km |
| Sep 29, 2004 | 25km SSW of Bodfish, California | M5.0 | 130 km | 3 km |
| Jun 26, 1995 | 11km SW of Valencia, California | M5.0 | 27 km | 13 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
61 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 51 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 1, 1983 | EF2 | 57 km | 3.5 mi | 0 |
| Nov 9, 1982 | EF2 | 83 km | 10.0 mi | 0 |
| Nov 9, 1982 | EF2 | 42 km | 1.0 mi | 0 |
| Nov 7, 1966 | EF2 | 68 km | 0.1 mi | 0 |
| Nov 7, 1966 | EF2 | 69 km | 10.3 mi | 0 |
| Mar 22, 2023 | EF1 | 77 km | 0.5 mi | 0 |
| Jan 19, 2010 | EF1 | 93 km | 4.6 mi | 0 |
| Jan 9, 1998 | EF1 | 85 km | 1.5 mi | 0 |
| Jan 14, 1993 | EF1 | 97 km | 1.0 mi | 0 |
| Dec 7, 1992 | EF1 | 100 km | 0.1 mi | 0 |
| Mar 20, 1992 | EF1 | 68 km | 0.2 mi | 0 |
| Oct 1, 1983 | EF1 | 62 km | 0.3 mi | 0 |
| Nov 9, 1982 | EF1 | 32 km | 0.2 mi | 0 |
| Mar 29, 1982 | EF1 | 76 km | 2.0 mi | 0 |
| Jan 31, 1979 | EF1 | 50 km | 0.1 mi | 0 |
| May 8, 1977 | EF1 | 83 km | 0.1 mi | 0 |
| Mar 16, 1977 | EF1 | 94 km | 10.9 mi | 0 |
| Jan 3, 1977 | EF1 | 87 km | 0.1 mi | 0 |
| Nov 9, 1964 | EF1 | 57 km | 1.0 mi | 0 |
| May 14, 1962 | EF1 | 69 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 | 92 km |
| 1930 | S. CALIFORNIA | Eruption + Earthquake | 3.1 m | 1 | 34 km |
| 1994 | WEST COAST, USA | Earthquake | 0.1 m | 57 | 34 km |
| 1855 | S. CALIFORNIA | Eruption + Earthquake | — | — | 76 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 | 44 km |
| 2007 | ZACA | 241,846 | 86 km |
| 2009 | STATION | 165,368 | 71 km |
| 2006 | DAY | 159,713 | 42 km |
| 1985 | WHEELER 2 | 126,854 | 51 km |
| 2020 | BOBCAT | 115,728 | 89 km |
| 2003 | SIMI | 107,756 | 14 km |
| 2018 | WOOLSEY | 97,962 | 15 km |
| 2003 | PIRU | 63,920 | 26 km |
| 1985 | FERNDALE | 46,724 | 29 km |
| 2016 | SAND | 41,561 | 53 km |
| 2007 | BUCKWEED | 41,332 | 51 km |
| 1993 | GREEN MEADOWS | 38,115 | 16 km |
| 2007 | RANCH | 37,009 | 34 km |
| 2016 | REY | 33,323 | 85 km |
| 2013 | POWERHOUSE | 32,329 | 62 km |
| 2020 | LAKE | 30,971 | 58 km |
| 1993 | STECKEL | 26,202 | 28 km |
| 2011 | COMANCHE | 25,965 | 98 km |
| 2005 | TOPANGA | 24,133 | 19 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 56°F (14°C) | 3.4 in | |
| February | 55°F (13°C) | 3.5 in | Wettest |
| March | 56°F (13°C) | 2.8 in | |
| April | 59°F (15°C) | 1.0 in | |
| May | 63°F (17°C) | 0.2 in | |
| June | 67°F (19°C) | 0.0 in | |
| July | 78°F (26°C) | 0.0 in | Warmest, Driest |
| August | 72°F (22°C) | 0.1 in | |
| September | 70°F (21°C) | 0.2 in | |
| October | 66°F (19°C) | 0.3 in | |
| November | 60°F (15°C) | 2.2 in | |
| December | 55°F (13°C) | 2.3 in | Coldest |
Santa Rosa Valley has a seasonal temperature swing of 23°F / from 55°F in December to 78°F in July. Total annual precipitation is 16.0 inches, with February being the wettest month (3.5") and July the driest (0.0").