Karnes County Climate
Karnes County, Texas
NOAA NCEI 1991-2020 Climate NormalsAvg Annual Temp
70.2°F
Annual Precip
30.9"
Annual Snowfall
0.4"
Extreme Heat Days
120
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Growing Season & Gardening
9a
Minimum winter temperature range for plant survival
7,588
Excellent for heat-loving crops
Seasonal Overview
National Comparison
7-Day Outlook
Forecast
Current Conditions
Air Quality
Safety
Weather Alerts
Climate Advisory: Karnes County
Climate Verdict
Karnes County has a warm, averaging 70.2°F year-round, moderate rainfall of 30.9 inches per year, extreme heat exposure with 120.1 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 53.6°F. summers are hot, with July averaging 84.7°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
Karnes County is 4.7°F warmer than the Texas statewide average of 65.5°F, the county experiences 15.25812661732418 more extreme heat days than the state average.
Climate Profile
About Karnes County Weather
Warm South Texas plains environment
Karnes County has an average annual temperature of 70.2°F, placing it well above the national median. The climate is primarily humid subtropical with long, hot summers.
Sitting above the Texas thermal average
At 70.2°F, Karnes County is warmer than the state average of 65.5°F. Its 30.9 inches of rain nearly matches the state's 31.9-inch average, providing a typical Texas balance of heat and moisture.
Warmer than the Hill Country
Karnes is nearly 4 degrees warmer annually than Kendall County to its northwest. While drier than the coastal counties, it remains more humid than the inland plains of Jones County.
Long heat waves and mild winters
The county sees 120 days of extreme heat over 90°F, with summer averages reaching 84.1°F. Winters are pleasant and mild, averaging 55.2°F with virtually no snowfall.
Protect against sun and humidity
The 120 days of extreme heat require reliable air conditioning and sun protection for outdoor workers. Minimal snow means winter gear is rarely needed, but humidity management is a year-round task.
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.