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Weather & Climate in Sullivan City, TX

Temperature, precipitation, air quality, natural hazards, and monthly weather data.

Sullivan City has a warm climate with an average annual temperature of 74°F (24°C). Winters average 58°F in January while summers reach 87°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 22.5 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 210 feet.

Temperature

58°F Jan (14°C) 87°F Jul (31°C)
Annual Average74.4°F
38% above US avg
January Average58°F (14°C)
July Average87°F (31°C)
Sunny Days312 days/yr

Geography

Elevation210 ft (64 m)
Area3.6 sq mi (9.3 km²)
Population Density1,092/sq mi
Coordinates26.2752°N, 98.5644°W
TimezoneAmerica/Chicago
CountyStarr County County
Nearest AirportMc Allen International (MFE)
23 miles away

Precipitation & Snow

Annual Rainfall 22.5"
41% below US avg
Snowfall 0.1"
Wettest Month (Sep) 3.74"
Driest Month (Mar) 0.55"

Air Quality

AQI Median42.0
RatingGood

Natural Hazard Risk

Overall RiskRelatively Moderate
Risk Score84.8 / 100
Social Vulnerability97.0 / 100
Community Resilience0.4 / 100

Hazard Breakdown

Tornado Relatively Low
Hurricane Relatively Low
Earthquake Very Low
Wildfire Relatively Low
Flood Relatively Low
Hail Relatively Low
Strong Wind Very Low
Heat Wave Relatively Moderate
Winter Weather Relatively Low
Lightning Very Low
Ice Storm Relatively Moderate
Drought Relatively Moderate
Cold Wave Very High
Landslide Very Low
Source: FEMA National Risk Index v1.20 (Dec 2025)

Earthquake History

12 earthquakes (M2.5+) recorded within 150 km since 1990. Strongest on record: M4.4.

Jun 14, 2009 35 km E of Ciudad General Terán, Mexico M4.4 134 km 18 km
Mar 18, 2014 18 km E of Pueblo Nuevo, Mexico M4.1 136 km 1 km
Jan 19, 2014 12 km SSW of China, Mexico M4.1 105 km 12 km
Dec 22, 2013 19 km NE of Ciudad General Terán, Mexico M4.0 140 km 37 km
Feb 11, 2014 31 km SSE of China, Mexico M4.0 110 km 41 km
Mar 4, 2014 27 km SE of Los Ramones, Mexico M4.0 123 km 5 km
Nov 25, 2013 23 km SE of Los Ramones, Mexico M4.0 125 km 10 km
Mar 2, 2014 15 km SW of China, Mexico M4.0 108 km 8 km
Nov 30, 2013 26 km SE of Los Ramones, Mexico M3.9 124 km 2 km
Mar 5, 2014 18 km SSW of China, Mexico M3.9 109 km 10 km
Nov 26, 2013 22 km S of China, Mexico M3.6 109 km 37 km
Aug 30, 2016 11 km N of Los Ramones, Mexico M3.6 120 km 38 km
Source: USGS Earthquake Catalog (M2.5+, 1990–2025). Sorted by magnitude.

Hurricane History

10 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 67 km
2017 Harvey Category 4 132 mph 238 km
2010 Alex Category 2 109 mph 240 km
2008 Dolly Category 2 98 mph 80 km
2005 Emily Category 3 127 mph 142 km
2003 Erika Category 1 75 mph 154 km
1999 Bret Category 4 144 mph 103 km
1988 Gilbert Category 4 132 mph 188 km
1983 Barry Category 1 81 mph 144 km
1980 Allen Category 4 144 mph 66 km
Source: NOAA IBTrACS (Category 1+, 1980–2026).

Tornado History

102 tornadoes (EF0+) recorded within 100 km since 1950. Strongest on record: EF3. Total: 68 injuries.

Date Rating Distance Path Fatalities
Mar 15, 1983 EF3 35 km 6.1 mi 0
May 12, 1969 EF3 98 km 0.1 mi 0
May 12, 1969 EF3 88 km 0.1 mi 0
Apr 19, 1965 EF3 53 km 1.5 mi 0
May 5, 1991 EF2 29 km 1.0 mi 0
May 24, 1970 EF2 83 km 25.5 mi 0
May 23, 1970 EF2 99 km 4.5 mi 0
May 23, 1970 EF2 99 km 4.5 mi 0
Apr 26, 1967 EF2 13 km 40.2 mi 0
Jun 1, 1962 EF2 81 km 1.0 mi 0
Sep 7, 1956 EF2 99 km 0.1 mi 0
Jan 26, 1950 EF2 81 km 4.7 mi 0
Oct 30, 2015 EF1 90 km 0.7 mi 0
Jun 30, 2011 EF1 41 km 0.4 mi 0
Jul 16, 2007 EF1 34 km 1.0 mi 0
Apr 30, 2003 EF1 13 km 0.3 mi 0
May 21, 2001 EF1 25 km 0.2 mi 0
May 21, 2001 EF1 24 km 0.1 mi 0
Jun 14, 1994 EF1 28 km 0.5 mi 0
Sep 16, 1988 EF1 87 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 58 km
2021 KING 9,793 85 km
2022 VIB 7,817 88 km
2017 HOPPER 7,150 91 km
2022 BLANKET 5,823 90 km
2008 ENCINO 3,979 81 km
2021 NORTH JONES 3,541 84 km
2008 UNNAMED 3,389 65 km
2011 KING RANCH 3,075 92 km
2008 JONES RANCH 2,998 68 km
2005 2686 2,979 61 km
2009 HOPPER 2,929 89 km
2021 JONES 2,178 78 km
2010 ENCINITOS RANCH 1,967 59 km
2022 755 1,846 82 km
2011 ENCINITOS 1,748 61 km
2009 STILLMAN 1,466 78 km
2023 ELECTRIC SLIDE 1,410 83 km
2008 SAN RAFAEL RANCH 1,407 61 km
2005 BORREGO 1,392 65 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 62°F (17°C) 1.0 in
March 70°F (21°C) 0.6 in Driest
April 75°F (24°C) 1.3 in
May 80°F (27°C) 2.9 in
June 84°F (29°C) 2.8 in
July 87°F (31°C) 1.7 in Warmest
August 86°F (30°C) 2.3 in
September 83°F (28°C) 3.7 in Wettest
October 76°F (24°C) 2.3 in
November 67°F (20°C) 1.0 in
December 60°F (16°C) 1.0 in

Sullivan City has a seasonal temperature swing of 29°F / from 58°F in January to 87°F in July. Total annual precipitation is 21.9 inches, with September being the wettest month (3.7") and March the driest (0.6").

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