McMullen County Climate
McMullen County, Texas
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
71.5°F
Annual Precip
25.0"
Annual Snowfall
0.4"
Extreme Heat Days
149
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
9b
Minimum winter temperature range for plant survival
8,007
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: McMullen County
Climate Verdict
McMullen County has a warm, averaging 71.5°F year-round, semi-arid conditions with only 25.0 inches of annual precipitation, extreme heat exposure with 148.73333333333332 days per year above 90°F, light snow averaging 0.4 inches per year. This climate profile shapes everything from energy costs to outdoor recreation opportunities.
Seasonal Breakdown
Winters are mild, with January temperatures averaging 54.3°F. summers are hot, with July averaging 85.8°F. The 31°F seasonal variation provides noticeable but manageable change. January is typically the coldest month and August the warmest.
Outdoor & Gardening Guidance
Summer outdoor activities should be planned for early morning or evening to avoid extreme heat.
Regional Context
McMullen County is 6.0°F warmer than the Texas statewide average of 65.5°F, it is also noticeably drier, receiving 6.9 inches less precipitation than the state average, the county experiences 43.891459950657506 more extreme heat days than the state average.
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 sources: NOAA National Centers for Environmental Information (NCEI), U.S. Climate Normals 1991-2020. Forecast and alert data from National Weather Service API. Air quality data from Open-Meteo.
Climate normals are 30-year averages of weather variables. Station data is aggregated to county level. Forecasts and alerts are fetched live and may change frequently. Data is informational only — not a substitute for official National Weather Service forecasts or emergency weather warnings.