Karnes County Climate
Karnes County, Texas
Avg Annual Temp
70.2°F
Annual Precip
30.9"
Annual Snowfall
0.4"
Extreme Heat Days
120.1
days >= 90°F/yr
Monthly Temperature
Precipitation Calendar
Seasonal Overview
National Comparison
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 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.