McMullen County Climate
McMullen County, Texas
Avg Annual Temp
71.5°F
Annual Precip
25.0"
Annual Snowfall
0.4"
Extreme Heat Days
148.73333333333332
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
Climate Profile
About McMullen County Weather
One of the nation's warmest
McMullen County averages a hot 71.5°F annually, which is far above the national median. This South Texas climate is defined by long, intense summers and very short winters.
High ranking heat in Texas
The average temperature of 71.5°F is a significant 6 degrees warmer than the Texas state average of 65.5°F. It is one of the most heat-intensive counties in the entire state.
Challenging the border heat
McMullen records 149 extreme heat days, nearly matching neighbor Maverick County's 151 days. It is slightly wetter than Maverick, receiving 25.0 inches of annual precipitation.
Perpetual summer and trace snow
The county averages 149 days over 90°F, with summer temperatures reaching 85.4°F. Winter is essentially a mild spring, with a February average of 56.2°F and only 0.4 inches of snow.
Serious cooling and sun safety
Outdoor workers and residents must plan for nearly five months of temperatures over 90°F. Industrial-grade cooling systems and sun-protective gear are essential for local life.
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.