Weather & Climate in Tracy, CA
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Tracy enjoys a temperate climate with an average annual temperature of 61°F (16°C). Winters average 47°F in January while summers reach 75°F in July. Annual precipitation totals 12.7 inches (drier than the 38-inch national average). Air quality is rated Moderate with a median AQI of 51. 49% of days have good air quality. The city sits at an elevation of 66 feet.
Temperature
47°F Jan (8°C)
75°F Jul (24°C)
| Annual Average | 61.0°F |
| 13% above US avg | |
| January Average | 47°F (8°C) |
| July Average | 75°F (24°C) |
Geography
| Elevation | 66 ft (20 m) |
| Area | 22.1 sq mi (57.3 km²) |
| Population Density | 3,620/sq mi |
| Coordinates | 37.7274°N, 121.4522°W |
| Timezone | America/Los_Angeles |
| County | San Joaquin County County |
| Nearest Airport | Norman Y Mineta San Jose International (SJC) 36 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 51.0 |
| Rating | Moderate |
| Good Days % | 48.6% |
| Unhealthy Days | 11 |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 98.6 / 100 |
| Social Vulnerability | 39.7 / 100 |
| Community Resilience | 47.0 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Earthquake | Relatively High |
| Wildfire | Relatively Moderate |
| Flood | Relatively High |
| Hail | Relatively Low |
| Strong Wind | Relatively Low |
| Heat Wave | Relatively High |
| Winter Weather | Relatively Low |
| Lightning | Relatively High |
| Drought | Very High |
| Cold Wave | No Rating |
| Landslide | Very Low |
| Volcano | Very Low |
| Avalanche | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
4,163 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M6.0.
| Aug 24, 2014 | The 2014 South Napa, California Earthquake | M6.0 | 93 km | 11 km |
| Apr 18, 1990 | 5 km NNW of Aromas, California | M5.4 | 90 km | 5 km |
| Aug 12, 1998 | 10 km SW of Ridgemark, California | M5.1 | 108 km | 9 km |
| Apr 18, 1990 | 4 km E of Interlaken, California | M5.1 | 88 km | 7 km |
| Jan 16, 1993 | 9 km E of Gilroy, California | M4.9 | 79 km | 7 km |
| May 14, 2002 | 5 km SSW of Gilroy, California | M4.9 | 86 km | 7 km |
| Apr 19, 1996 | 2 km E of Aromas, California | M4.9 | 95 km | 5 km |
| Apr 18, 1990 | 4 km NNW of Aromas, California | M4.9 | 90 km | 6 km |
| Apr 23, 1995 | 22 km NNE of Soledad, California | M4.9 | 127 km | 7 km |
| Sep 3, 2000 | 5 km WSW of Yountville, California | M4.9 | 111 km | 9 km |
| Apr 18, 1990 | 4 km N of Aromas, California | M4.7 | 91 km | 4 km |
| May 21, 1996 | 8 km ESE of East Foothills, California | M4.7 | 47 km | 8 km |
| Aug 11, 1993 | 14 km ESE of Alum Rock, California | M4.7 | 50 km | 9 km |
| Aug 27, 2011 | 21 km NE of Soledad, California | M4.6 | 129 km | 8 km |
| Mar 24, 1991 | 1 km NNE of Interlaken, California | M4.6 | 88 km | 15 km |
| Aug 18, 1999 | 0 km S of Bolinas, California | M4.6 | 110 km | 8 km |
| Sep 19, 2023 | 15 km SW of Westley, CA | M4.5 | 35 km | 4 km |
| Jan 12, 2011 | 9 km SSE of San Juan Bautista, California | M4.5 | 106 km | 8 km |
| Aug 3, 2006 | 5 km W of Glen Ellen, California | M4.5 | 122 km | 9 km |
| Apr 4, 2023 | 1km NNW of Tres Pinos, CA | M4.4 | 104 km | 10 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Tornado History
90 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF2. Total: 10 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 5, 1998 | EF2 | 65 km | 0.6 mi | 0 |
| Mar 11, 1985 | EF2 | 98 km | 0.5 mi | 0 |
| Apr 27, 1953 | EF2 | 41 km | 0.1 mi | 0 |
| Jan 11, 1951 | EF2 | 71 km | 5.7 mi | 0 |
| Dec 14, 2024 | EF1 | 91 km | 0.3 mi | 0 |
| Mar 11, 2023 | EF1 | 84 km | 0.8 mi | 0 |
| Jan 10, 2023 | EF1 | 73 km | 0.4 mi | 0 |
| Nov 15, 2015 | EF1 | 61 km | 3.0 mi | 0 |
| Jan 23, 2010 | EF1 | 34 km | 1.6 mi | 0 |
| Apr 14, 2006 | EF1 | 41 km | 0.5 mi | 0 |
| Mar 20, 2005 | EF1 | 86 km | 3.0 mi | 0 |
| Dec 16, 2002 | EF1 | 93 km | 1.3 mi | 0 |
| Dec 20, 2001 | EF1 | 89 km | 0.5 mi | 0 |
| May 5, 1998 | EF1 | 70 km | 0.3 mi | 0 |
| Dec 12, 1996 | EF1 | 53 km | 0.6 mi | 0 |
| Nov 22, 1996 | EF1 | 99 km | 0.2 mi | 0 |
| Apr 19, 1988 | EF1 | 56 km | 0.2 mi | 0 |
| Jan 14, 1980 | EF1 | 47 km | 0.3 mi | 0 |
| Mar 4, 1978 | EF1 | 63 km | 1.0 mi | 0 |
| Mar 4, 1978 | EF1 | 56 km | 2.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Tsunami History
5 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 | 57 km |
| 1989 | N. CALIFORNIA | Earthquake | 1.0 m | 62 | 86 km |
| 1856 | N. CALIFORNIA | Eruption + Earthquake | 0.6 m | - | 79 km |
| 1906 | N. CALIFORNIA | Eruption + Earthquake | 0.1 m | - | 92 km |
| 1865 | N. CALIFORNIA | Eruption + Earthquake | - | - | 71 km |
Source: NOAA/NCEI Historical Tsunami Database.
Nearby Volcanoes
1 volcano within 200 km. Closest: Clear Lake (180 km).
| Name | Type | Elevation | Last Eruption | Distance |
| Clear Lake | Volcanic field | 1,439 m (4,721 ft) | Unknown | 180 km |
Source: Smithsonian Institution Global Volcanism Program (GVP).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: SCU LIGHTNING COMPLEX (405,787 acres, 2020).
| Year | Name | Acres Burned | Distance |
| 2020 | SCU LIGHTNING COMPLEX | 405,787 | 26 km |
| 2020 | CZU AUG LIGHTNING | 85,894 | 93 km |
| 2015 | BUTTE | 72,894 | 96 km |
| 2017 | ATLAS | 51,664 | 99 km |
| 2007 | LICK | 47,424 | 56 km |
| 2006 | CANYON | 36,851 | 42 km |
| 1988 | MILLER | 35,750 | 96 km |
| 1992 | GULCH | 18,019 | 99 km |
| 2003 | ANNIE | 17,383 | 58 km |
| 2024 | CORRAL | 16,138 | 10 km |
| 2018 | WAVERLY | 12,238 | 61 km |
| 2009 | CORRAL | 12,006 | 15 km |
| 1985 | LEXINGTON | 11,550 | 76 km |
| 1996 | SCOTT | 8,828 | 100 km |
| 2015 | WRAGG | 8,455 | 100 km |
| 2009 | LOCKHEED | 8,287 | 98 km |
| 2003 | BIRD | 7,727 | 22 km |
| 1984 | SITE 300 3 | 6,911 | 9 km |
| 2005 | TESLA | 6,638 | 12 km |
| 2003 | DEL PUERTO | 6,441 | 33 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 47°F (8°C) | 2.3 in | |
| February | 51°F (10°C) | 2.6 in | Wettest |
| March | 55°F (13°C) | 1.7 in | |
| April | 59°F (15°C) | 1.0 in | |
| May | 65°F (19°C) | 0.7 in | |
| June | 72°F (22°C) | 0.2 in | |
| July | 75°F (24°C) | 0.0 in | Warmest, Driest |
| August | 74°F (23°C) | 0.0 in | |
| September | 71°F (22°C) | 0.1 in | |
| October | 64°F (18°C) | 0.7 in | |
| November | 54°F (12°C) | 1.1 in | |
| December | 46°F (8°C) | 2.3 in | Coldest |
Tracy has a seasonal temperature swing of 29°F / from 46°F in December to 75°F in July. Total annual precipitation is 12.7 inches, with February being the wettest month (2.6") and July the driest (0.0").