Starr County Climate
Starr County, Texas
Avg Annual Temp
75.5°F
Annual Precip
21.0"
Annual Snowfall
0.1"
Extreme Heat Days
190.75
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About Starr County Weather
Among the Nation's Hottest Regions
With an annual average temperature of 75.5°F, Starr County is dramatically warmer than the national median of 54°F. This semi-arid climate receives only 21.0 inches of rain, well below the national average for precipitation.
Surpassing the Texas Temperature Average
Starr County averages 75.5°F annually, which is a full 10 degrees higher than the Texas state average of 65.5°F. It ranks as one of the warmest counties in the entire state due to its southern location.
The Scorching Heart of South Texas
The county's 75.5°F average outpaces nearly every other county in this report, including Sutton County at 65.8°F. It remains significantly drier than eastern neighbors, receiving 10 inches less rain than Somervell.
Dominant Heat for Half the Year
Extreme heat is the norm here, with 191 days per year hitting at least 90°F. July is punishing with an average of 88.3°F, while winters remain exceptionally mild at 61.1°F.
Prioritize Sun Protection and Hydration
Residents must plan for extreme heat for over six months of the year, making reliable air conditioning a critical utility. UV protection and high-capacity cooling systems are necessary for the 191 days of 90-degree weather.
Frequently Asked Questions
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Data source: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020.
Climate normals are 30-year averages of weather variables computed from 1991 to 2020. Station data is aggregated to county level using spatial averaging. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.