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Weather & Climate in Chula Vista CDP (Zavala County), TX
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Chula Vista CDP (Zavala County) has a warm climate with an average annual temperature of 73°F (23°C). Winters average 55°F in January while summers reach 86°F in July. The area gets 324 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 19.5 inches (drier than the 38-inch national average). Air quality is rated Good with a median AQI of 42. The city sits at an elevation of 557 feet.
Temperature
55°F Jan (13°C)
86°F Jul (30°C)
| Annual Average | 72.7°F |
| 35% above US avg | |
| January Average | 55°F (13°C) |
| July Average | 86°F (30°C) |
| Sunny Days | 324 days/yr |
Geography
| Elevation | 557 ft (170 m) |
| Area | 0.2 sq mi (0.5 km²) |
| Population Density | 462/sq mi |
| Coordinates | 28.6595°N, 99.8043°W |
| Timezone | America/Chicago |
| County | Zavala County County |
| Nearest Airport | Maverick County Memorial International (EGP) 45 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively Low |
| Risk Score | 53.6 / 100 |
| Social Vulnerability | 98.6 / 100 |
| Community Resilience | 4.5 / 100 |
Hazard Breakdown
| Tornado | Relatively Low |
| Hurricane | Relatively Low |
| Earthquake | Very Low |
| Wildfire | Very Low |
| Flood | Relatively Low |
| Hail | Relatively Low |
| Strong Wind | Very Low |
| Heat Wave | Relatively Low |
| Winter Weather | Very Low |
| Lightning | Relatively Low |
| Ice Storm | Very Low |
| Drought | Relatively High |
| Cold Wave | Relatively Low |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
57 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M3.6.
| Jul 24, 2025 | 18 km E of El Indio, Texas | M3.6 | 35 km | 1 km |
| Apr 3, 2005 | 11 km NE of Guerrero, Mexico | M3.5 | 57 km | 5 km |
| Jun 24, 2012 | 16 km ESE of Tilden, Texas | M3.4 | 141 km | 5 km |
| Feb 20, 2022 | 3 km S of El Indio, Texas | M3.4 | 54 km | 3 km |
| Jan 9, 2021 | 3 km WSW of El Indio, Texas | M3.3 | 56 km | 9 km |
| Feb 18, 2021 | 7 km SSE of El Indio, Texas | M3.3 | 52 km | 7 km |
| Sep 10, 2014 | 7 km NNE of Charlotte, Texas | M3.2 | 114 km | 5 km |
| Jun 1, 2018 | 2 km SW of Christine, Texas | M3.1 | 126 km | 8 km |
| Jul 24, 2021 | 11 km NW of Tilden, Texas | M3.1 | 115 km | 5 km |
| Jun 18, 2021 | 3 km SSW of El Indio, Texas | M3.1 | 55 km | 2 km |
| Feb 27, 2021 | 6 km WNW of El Indio, Texas | M3.0 | 57 km | 9 km |
| Jun 3, 2018 | 8 km E of Christine, Texas | M3.0 | 137 km | 3 km |
| Jun 11, 2018 | 6 km E of Christine, Texas | M2.9 | 135 km | 3 km |
| Sep 21, 2024 | 17 km NE of Tilden, Texas | M2.9 | 138 km | 6 km |
| Apr 11, 2009 | 5 km SSE of Jourdanton, Texas | M2.8 | 127 km | 5 km |
| Jul 14, 2025 | 17 km SW of Charlotte, Texas | M2.8 | 95 km | 4 km |
| Jan 16, 2015 | 5 km NW of Jourdanton, Texas | M2.8 | 123 km | 5 km |
| Mar 25, 2023 | 23 km NNW of Three Rivers, Texas | M2.8 | 150 km | 5 km |
| Mar 20, 2019 | 3 km E of Cotulla, Texas | M2.8 | 64 km | 5 km |
| Aug 10, 1992 | 4 km NNW of Pleasanton, Texas | M2.8 | 133 km | 5 km |
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.
Hurricane History
5 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2020 | Hanna | Category 1 | 92 mph | 290 km |
| 2017 | Harvey | Category 4 | 132 mph | 244 km |
| 2003 | Claudette | Category 1 | 81 mph | 284 km |
| 1999 | Bret | Category 4 | 138 mph | 241 km |
| 1980 | Allen | Category 3 | 115 mph | 135 km |
Source: NOAA IBTrACS (Category 1+, 1980–2026).
Tornado History
81 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF4. Total: 15 fatalities, 25 injuries.
| Date | Rating | Distance | Path | Fatalities |
| May 16, 1989 | EF4 | 91 km | 17.0 mi | 0 |
| Apr 15, 1973 | EF4 | 60 km | 23.3 mi | 5 |
| Apr 24, 2007 | EF3 | 59 km | 4.0 mi | 7 |
| Apr 29, 1975 | EF3 | 76 km | 8.3 mi | 3 |
| Jun 26, 1970 | EF3 | 94 km | 3.8 mi | 0 |
| Mar 19, 2012 | EF2 | 100 km | 3.5 mi | 0 |
| Mar 19, 2006 | EF2 | 63 km | 2.0 mi | 0 |
| Apr 7, 2002 | EF2 | 80 km | 1.0 mi | 0 |
| May 24, 1981 | EF2 | 61 km | 2.0 mi | 0 |
| May 19, 1975 | EF2 | 62 km | 0.1 mi | 0 |
| May 6, 1972 | EF2 | 85 km | 6.5 mi | 0 |
| Feb 25, 1971 | EF2 | 16 km | 2.0 mi | 0 |
| Aug 3, 1970 | EF2 | 52 km | 0.1 mi | 0 |
| Aug 3, 1970 | EF2 | 62 km | 0.1 mi | 0 |
| May 6, 1969 | EF2 | 66 km | 0.1 mi | 0 |
| Nov 26, 1968 | EF2 | 57 km | 18.2 mi | 0 |
| May 23, 1966 | EF2 | 5 km | 16.0 mi | 0 |
| May 2, 1959 | EF2 | 59 km | 4.6 mi | 0 |
| May 1, 1959 | EF2 | 80 km | 5.7 mi | 0 |
| Oct 18, 1956 | EF2 | 3 km | 1.0 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950–2024, US only).
Wildfire History
8 wildfires (100+ acres) recorded within 100 km. Largest: HIGHWAY 322 (44,652 acres, 2008).
| Year | Name | Acres Burned | Distance |
| 2008 | HIGHWAY 322 | 44,652 | 53 km |
| 2008 | COTULLA | 8,419 | 60 km |
| 2022 | LOS ANGELES | 6,287 | 90 km |
| 2022 | BURR | 4,633 | 83 km |
| 2008 | COMMANCHE RANCH | 4,488 | 29 km |
| 2009 | FARCO MINE | 2,421 | 90 km |
| 2008 | UNNAMED | 1,522 | 56 km |
| 2018 | MINE | 1,224 | 90 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 55°F (13°C) | 0.9 in | |
| February | 58°F (15°C) | 1.1 in | |
| March | 66°F (19°C) | 0.9 in | Driest |
| April | 73°F (23°C) | 1.9 in | |
| May | 79°F (26°C) | 3.0 in | Wettest |
| June | 84°F (29°C) | 2.6 in | |
| July | 86°F (30°C) | 1.2 in | Warmest |
| August | 86°F (30°C) | 2.4 in | |
| September | 81°F (27°C) | 2.8 in | |
| October | 73°F (23°C) | 2.7 in | |
| November | 63°F (17°C) | 1.1 in | |
| December | 55°F (13°C) | 0.9 in | Coldest |
Chula Vista CDP (Zavala County) has a seasonal temperature swing of 31°F / from 55°F in December to 86°F in July. Total annual precipitation is 21.6 inches, with May being the wettest month (3.0") and March the driest (0.9").