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Weather & Climate in Alton, TX
Temperature, precipitation, air quality, natural hazards, and monthly weather data.
Alton has a warm climate with an average annual temperature of 73°F (23°C). Winters average 58°F in January while summers reach 85°F in July. The area gets 312 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 20.2 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 159 feet.
Temperature
58°F Jan (14°C)
85°F Jul (30°C)
| Annual Average | 73.4°F |
| 36% above US avg | |
| January Average | 58°F (14°C) |
| July Average | 85°F (30°C) |
| Sunny Days | 312 days/yr |
Geography
| Elevation | 159 ft (48 m) |
| Area | 5.9 sq mi (15.3 km²) |
| Population Density | 2,527/sq mi |
| Coordinates | 26.2878°N, 98.3090°W |
| Timezone | America/Chicago |
| County | Hidalgo County County |
| Nearest Airport | Mc Allen International (MFE) 9 miles away |
Precipitation & Snow
Air Quality
| AQI Median | 42.0 |
| Rating | Good |
Natural Hazard Risk
| Overall Risk | Relatively High |
| Risk Score | 99.0 / 100 |
| Social Vulnerability | 92.7 / 100 |
| Community Resilience | 0.9 / 100 |
Hazard Breakdown
| Tornado | Relatively High |
| Hurricane | Very High |
| Earthquake | Relatively Low |
| Wildfire | Relatively Low |
| Flood | Relatively High |
| Hail | Very High |
| Strong Wind | Relatively High |
| Heat Wave | Relatively High |
| Winter Weather | Relatively High |
| Lightning | Relatively High |
| Ice Storm | Very High |
| Drought | Relatively High |
| Cold Wave | Very High |
| Landslide | Very Low |
Source: FEMA National Risk Index v1.20 (Dec 2025)
Earthquake History
9 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.1.
| Jan 19, 2014 | 12 km SSW of China, Mexico | M4.1 | 125 km | 12 km |
| Feb 11, 2014 | 31 km SSE of China, Mexico | M4.0 | 126 km | 41 km |
| Mar 4, 2014 | 27 km SE of Los Ramones, Mexico | M4.0 | 143 km | 5 km |
| Nov 25, 2013 | 23 km SE of Los Ramones, Mexico | M4.0 | 145 km | 10 km |
| Mar 2, 2014 | 15 km SW of China, Mexico | M4.0 | 129 km | 8 km |
| Nov 30, 2013 | 26 km SE of Los Ramones, Mexico | M3.9 | 145 km | 2 km |
| Mar 5, 2014 | 18 km SSW of China, Mexico | M3.9 | 128 km | 10 km |
| Nov 26, 2013 | 22 km S of China, Mexico | M3.6 | 128 km | 37 km |
| Aug 30, 2016 | 11 km N of Los Ramones, Mexico | M3.6 | 144 km | 38 km |
Source: USGS Earthquake Catalog (M2.5+, 1990-2025). Sorted by magnitude.
Hurricane History
13 hurricanes (Category 1+) recorded within 500 km since 1980. Strongest on record: Category 4.
| Year | Name | Category | Max Wind | Closest |
| 2024 | Beryl | Category 1 | 92 mph | 294 km |
| 2021 | Nicholas | Category 1 | 75 mph | 283 km |
| 2020 | Hanna | Category 1 | 92 mph | 46 km |
| 2017 | Harvey | Category 4 | 132 mph | 217 km |
| 2010 | Alex | Category 2 | 109 mph | 236 km |
| 2008 | Dolly | Category 2 | 98 mph | 56 km |
| 2005 | Emily | Category 3 | 127 mph | 149 km |
| 2003 | Claudette | Category 1 | 92 mph | 292 km |
| 2003 | Erika | Category 1 | 75 mph | 140 km |
| 1999 | Bret | Category 4 | 144 mph | 89 km |
| 1988 | Gilbert | Category 4 | 132 mph | 194 km |
| 1983 | Barry | Category 1 | 81 mph | 128 km |
| 1980 | Allen | Category 5 | 161 mph | 50 km |
Source: NOAA IBTrACS (Category 1+, 1980-2026).
Tornado History
119 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 28 injuries.
| Date | Rating | Distance | Path | Fatalities |
| Mar 15, 1983 | EF3 | 27 km | 6.1 mi | 0 |
| May 12, 1969 | EF3 | 74 km | 0.1 mi | 0 |
| May 12, 1969 | EF3 | 63 km | 0.1 mi | 0 |
| Apr 19, 1965 | EF3 | 46 km | 1.5 mi | 0 |
| May 5, 1991 | EF2 | 31 km | 1.0 mi | 0 |
| Aug 9, 1980 | EF2 | 84 km | 4.6 mi | 0 |
| May 24, 1970 | EF2 | 59 km | 25.5 mi | 0 |
| May 12, 1969 | EF2 | 94 km | 0.1 mi | 0 |
| Apr 26, 1967 | EF2 | 19 km | 40.2 mi | 0 |
| Jun 1, 1962 | EF2 | 57 km | 1.0 mi | 0 |
| Jan 26, 1950 | EF2 | 69 km | 4.7 mi | 0 |
| Oct 30, 2015 | EF1 | 64 km | 0.7 mi | 0 |
| Jun 30, 2011 | EF1 | 22 km | 0.4 mi | 0 |
| Jul 16, 2007 | EF1 | 13 km | 1.0 mi | 0 |
| Apr 30, 2003 | EF1 | 16 km | 0.3 mi | 0 |
| May 21, 2001 | EF1 | 8 km | 0.2 mi | 0 |
| May 21, 2001 | EF1 | 7 km | 0.1 mi | 0 |
| Apr 4, 1997 | EF1 | 91 km | 0.5 mi | 0 |
| Jun 14, 1994 | EF1 | 23 km | 0.5 mi | 0 |
| Sep 16, 1988 | EF1 | 62 km | 0.5 mi | 0 |
Source: NOAA Storm Prediction Center (EF0+, 1950-2024, US only).
Wildfire History
20 wildfires (100+ acres) recorded within 100 km. Largest: BURNS RANCH FIRE (58,395 acres, 2008).
| Year | Name | Acres Burned | Distance |
| 2008 | BURNS RANCH FIRE | 58,395 | 47 km |
| 2022 | HAYFIELD SOUTH | 11,038 | 82 km |
| 2021 | KING | 9,793 | 72 km |
| 2022 | VIB | 7,817 | 75 km |
| 2017 | HOPPER | 7,150 | 86 km |
| 2022 | BLANKET | 5,823 | 86 km |
| 2022 | POLO | 5,571 | 83 km |
| 2008 | ENCINO | 3,979 | 69 km |
| 2021 | NORTH JONES | 3,541 | 82 km |
| 2008 | UNNAMED | 3,389 | 72 km |
| 2011 | KING RANCH | 3,075 | 71 km |
| 2008 | JONES RANCH | 2,998 | 74 km |
| 2005 | 2686 | 2,979 | 76 km |
| 2009 | HOPPER | 2,929 | 85 km |
| 2009 | SAN CARLOS | 2,849 | 87 km |
| 2021 | JONES | 2,178 | 75 km |
| 2010 | ENCINITOS RANCH | 1,967 | 54 km |
| 2022 | 755 | 1,846 | 71 km |
| 2011 | ENCINITOS | 1,748 | 55 km |
| 2022 | DEER | 1,657 | 88 km |
Source: NIFC/IRWIN Wildfire Records (100+ acres).
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 58°F (14°C) | 1.3 in | Coldest |
| February | 63°F (17°C) | 1.3 in | |
| March | 70°F (21°C) | 0.6 in | Driest |
| April | 76°F (24°C) | 1.4 in | |
| May | 80°F (27°C) | 3.0 in | |
| June | 84°F (29°C) | 2.8 in | |
| July | 85°F (30°C) | 1.8 in | |
| August | 86°F (30°C) | 2.2 in | Warmest |
| September | 82°F (28°C) | 4.0 in | Wettest |
| October | 76°F (24°C) | 2.2 in | |
| November | 68°F (20°C) | 1.0 in | |
| December | 61°F (16°C) | 1.1 in |
Alton has a seasonal temperature swing of 28°F / from 58°F in January to 86°F in August. Total annual precipitation is 22.7 inches, with September being the wettest month (4.0") and March the driest (0.6").