Sullivan City, TX
Full City Profile · Texas · Starr County County
3.1
/5.0
B
Good
3,919
Population
1,092/sq mi density
$44,286
Median Income
$15,286 per capita
$90,800
Home Value
$127,023 Zillow
$618
Median Rent
32.2% income on rent
77°F
Avg Temperature
B
Overall
3.1 / 5.0
Good overall score based on economy, affordability, safety and education
C+
Economy
2.6 / 5.0
$44,286 median income, 4.2% unemployment
A+
Affordability
5.0 / 5.0
$90,800 home value, $618/mo rent
D
Education
1.8 / 5.0
10.4% bachelor's degree or higher
Sullivan City has a warm climate with an average annual temperature of 77°F (25°C). Winters average 63°F in January while summers reach 89°F in July. Annual precipitation totals 22.2 inches. The area receives 0.2 inches of snow annually.
Temperature
63°F Jan (17°C)
89°F Jul (31°C)
| Annual Average | 77.4°F |
| 43% above US avg | |
| January Average | 63°F (17°C) |
| July Average | 89°F (31°C) |
Geography
| Elevation | 210 ft (64 m) |
| Area | 3.6 sq mi (9.3 km²) |
| Population Density | 1,092/sq mi |
| Coordinates | 26.2752°N, 98.5644°W |
| Timezone | America/Chicago |
| County | Starr County County |
| Nearest Airport | Mc Allen International (MFE) 23 miles away |
Precipitation & Snow
Air Quality
Natural Hazard Risk
| Overall Risk | Relatively Moderate |
| Risk Score | 84.8 / 100 |
| Social Vulnerability | 97.0 / 100 |
| Community Resilience | 0.4 / 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)
Monthly Weather
| Month | Avg Temperature | Precipitation | Summary |
|---|---|---|---|
| January | 63°F (17°C) | 0.8 in | Coldest |
| February | 67°F (20°C) | 0.7 in | Driest |
| March | 73°F (23°C) | 1.4 in | |
| April | 78°F (26°C) | 1.4 in | |
| May | 84°F (29°C) | 2.0 in | |
| June | 88°F (31°C) | 3.1 in | |
| July | 89°F (31°C) | 2.0 in | |
| August | 89°F (32°C) | 1.8 in | Warmest |
| September | 85°F (29°C) | 4.6 in | Wettest |
| October | 79°F (26°C) | 2.1 in | |
| November | 70°F (21°C) | 1.2 in | |
| December | 64°F (18°C) | 1.1 in |
Sullivan City has a seasonal temperature swing of 27°F / from 63°F in January to 89°F in August. Total annual precipitation is 22.2 inches, with September being the wettest month (4.6") and February the driest (0.7").