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Weather & Climate in Wilton, CA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Wilton enjoys a temperate climate with an average annual temperature of 62°F (17°C). Winters average 48°F in January while summers reach 76°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 18.4 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 119 feet.
Temperature
48°F Jan (9°C)
76°F Jul (24°C)
| Annual Average | 62.2°F |
| 15% above US avg | |
| January Average | 48°F (9°C) |
| July Average | 76°F (24°C) |
| Sunny Days | 330 days/yr |
Geography
| Elevation | 119 ft (36 m) |
| Area | 29.0 sq mi (75.1 km²) |
| Population Density | 214/sq mi |
| Coordinates | 38.4130°N, 121.2127°W |
| Timezone | America/Los_Angeles |
| County | Sacramento County County |
| Nearest Airport | Sacramento International (SMF) 28 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 48.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.1 / 100 |
| Social Vulnerability | 37.4 / 100 |
| Community Resilience | 57.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Moderate |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Moderate |
| Winter Weather | Very Low |
| Lightning | Relatively Moderate |
| Drought | Relatively High |
| Cold Wave | No Rating |
| Landslide | Relatively Low |
| Coastal Flood | No Rating |
| Volcano | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
5,141 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.1.
| Sep 12, 1994 | 4 km S of Carter Springs, Nevada | M6.1 | 143 km | 14 km |
| Aug 24, 2014 | The 2014 South Napa, California Earthquake | M6.0 | 98 km | 11 km |
| Jul 8, 2021 | Antelope Valley, CA | M6.0 | 150 km | 7 km |
| Sep 12, 1994 | 8 km ESE of Mesa Vista, California | M5.1 | 137 km | -1 km |
| Jul 8, 2021 | 32km SE of Markleeville, CA | M5.0 | 149 km | 7 km |
| Sep 3, 2000 | 5 km WSW of Yountville, California | M4.9 | 105 km | 9 km |
| Dec 22, 1995 | California-Nevada border region | M4.9 | 141 km | 4 km |
| Oct 30, 1998 | 4 km N of Tahoe Vista, California | M4.8 | 140 km | 1 km |
| Dec 28, 1995 | 9 km WNW of Topaz Lake, Nevada | M4.8 | 140 km | -1 km |
| Sep 4, 1995 | 13 km SW of Middletown, California | M4.8 | 137 km | 7 km |
| Jun 26, 2005 | 8 km NNW of Tahoe Vista, California | M4.8 | 139 km | -2 km |
| May 12, 2006 | 7 km W of Cobb, California | M4.7 | 146 km | 4 km |
| May 21, 1996 | 8 km ESE of East Foothills, California | M4.7 | 125 km | 8 km |
| Dec 23, 1995 | 8 km WNW of Topaz Lake, Nevada | M4.7 | 142 km | -1 km |
| Aug 11, 1993 | 14 km ESE of Alum Rock, California | M4.7 | 129 km | 9 km |
| Jan 2, 2025 | 4 km NW of Cobb, CA | M4.7 | 142 km | 1 km |
| May 7, 2021 | 19km NW of Truckee, CA | M4.7 | 140 km | 10 km |
| Jul 8, 2021 | 29km ENE of Dardanelle, CA | M4.6 | 145 km | 2 km |
| Dec 12, 1996 | 4 km SSW of Topaz Lake, Nevada | M4.6 | 146 km | -2 km |
| Aug 18, 1999 | 0 km S of Bolinas, California | M4.6 | 141 km | 8 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Tornado History
78 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 1 injury.
| Date | Rating | Distance | Path | Fatalities |
| Feb 7, 1978 | EF2 | 38 km | 1.9 mi | 0 |
| Apr 27, 1953 | EF2 | 87 km | 0.1 mi | 0 |
| Mar 11, 2023 | EF1 | 80 km | 0.8 mi | 0 |
| Jan 10, 2023 | EF1 | 54 km | 0.4 mi | 0 |
| Dec 24, 2015 | EF1 | 34 km | 6.2 mi | 0 |
| Oct 22, 2012 | EF1 | 79 km | 0.3 mi | 0 |
| Oct 22, 2012 | EF1 | 81 km | 2.0 mi | 0 |
| Oct 22, 2012 | EF1 | 71 km | 4.0 mi | 0 |
| Jan 23, 2010 | EF1 | 74 km | 1.6 mi | 0 |
| Apr 14, 2006 | EF1 | 87 km | 0.5 mi | 0 |
| Dec 12, 1996 | EF1 | 78 km | 0.6 mi | 0 |
| Apr 19, 1988 | EF1 | 28 km | 0.2 mi | 0 |
| Apr 19, 1988 | EF1 | 30 km | 1.0 mi | 0 |
| Mar 22, 1983 | EF1 | 36 km | 2.0 mi | 0 |
| Mar 4, 1978 | EF1 | 93 km | 2.5 mi | 0 |
| Mar 1, 1978 | EF1 | 86 km | 1.5 mi | 0 |
| May 31, 1967 | EF1 | 50 km | 0.1 mi | 0 |
| Jan 14, 2023 | EF0 | 12 km | 0.3 mi | 0 |
| Nov 8, 2022 | EF0 | 13 km | 0.8 mi | 0 |
| Nov 18, 2020 | EF0 | 30 km | 4.4 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Tsunami History
4 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 | 111 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | — | 139 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | — | 138 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | — | — | 148 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
2 volcanoes within 200 km. Closest: Clear Lake (149 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 149 km |
| Mono Lake Volcanic Field | Pyroclastic cone(s) | 2,121 m (6,959 ft) | 1790 | 196 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: HENNESSEY (314,241 acres, 2020).
| Year | Name | Acres Burned | Distance |
| 2020 | HENNESSEY | 314,241 | 96 km |
| 2021 | CALDOR | 226,583 | 87 km |
| 2014 | KING | 99,070 | 82 km |
| 2018 | COUNTY | 92,450 | 87 km |
| 2022 | MOSQUITO | 77,858 | 83 km |
| 2015 | BUTTE | 72,894 | 57 km |
| 2017 | ATLAS | 51,664 | 89 km |
| 2004 | RUMSEY | 39,335 | 100 km |
| 1988 | 49R | 36,673 | 92 km |
| 1988 | MILLER | 35,750 | 77 km |
| 2013 | AMERICAN | 27,938 | 97 km |
| 1992 | CLEVELAND | 21,835 | 82 km |
| 1992 | GULCH | 18,019 | 69 km |
| 2004 | POWER | 17,266 | 82 km |
| 2001 | STAR | 16,846 | 99 km |
| 2024 | CORRAL | 16,138 | 89 km |
| 2001 | DARBY | 14,734 | 83 km |
| 2006 | ZAM ASSIST | 14,404 | 71 km |
| 2018 | WAVERLY | 12,238 | 56 km |
| 2009 | CORRAL | 12,006 | 94 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 48°F (9°C) | 3.9 in | Wettest |
| February | 51°F (10°C) | 3.4 in | |
| March | 54°F (12°C) | 3.2 in | |
| April | 59°F (15°C) | 1.3 in | |
| May | 66°F (19°C) | 0.5 in | |
| June | 72°F (22°C) | 0.2 in | |
| July | 76°F (24°C) | 0.1 in | Warmest, Driest |
| August | 75°F (24°C) | 0.1 in | |
| September | 72°F (22°C) | 0.4 in | |
| October | 64°F (18°C) | 1.1 in | |
| November | 53°F (12°C) | 2.8 in | |
| December | 45°F (7°C) | 2.7 in | Coldest |
Wilton has a seasonal temperature swing of 30°F / from 45°F in December to 76°F in July. Total annual precipitation is 19.5 inches, with January being the wettest month (3.9") and July the driest (0.1").