Karnes City, Texas climate: Normal weather by month, frost dates and records
Karnes City's normal year runs from 43°F January nights to 97°F August afternoons. (NOAA 1991-2020 normals)
In metric: a yearly mean of 21.2°C, January lows of 6°C, August highs of 36°C.
- NOAA stationKarnes City (2 mi N)
- Station IDUSC00414696
- Location28.91°N 97.88°W
- Elevation450 ft (137 m)
- Population3,620
On October 23, the normal high in Karnes City is 82°F and the normal low 58°F.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Karnes City.
- Jan 65° 43°
- Feb 68° 46°
- Mar 74° 52°
- Apr 82° 59°
- May 88° 66°
- Jun 93° 72°
- Jul 96° 74°
- Aug 97° 73°
- Sep 91° 69°
- Oct 83° 60°
- Nov 74° 51°
- Dec 66° 44°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like in Karnes City each month?
August is the warmest month, with normal highs of 97°F; January the coldest, with normal lows of 43°F.
| Month | High | Low | Mean | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|
| January | 65°F | 43°F | 53.6°F | – | <1 | 4 | 10 h 30 min |
| February | 68°F | 46°F | 57.1°F | – | <1 | 2 | 11 h 10 min |
| March | 74°F | 52°F | 63.1°F | – | <1 | <1 | 12 h |
| April | 82°F | 59°F | 70.2°F | – | 4 | <1 | 12 h 50 min |
| May | 88°F | 66°F | 77.0°F | – | 14 | <1 | 13 h 30 min |
| June | 93°F | 72°F | 82.6°F | – | 22 | <1 | 14 h |
| July | 96°F | 74°F | 84.7°F | – | 28 | <1 | 13 h 50 min |
| August | 97°F | 73°F | 85.1°F | – | 28 | <1 | 13 h 10 min |
| September | 91°F | 69°F | 79.9°F | – | 18 | <1 | 12 h 20 min |
| October | 83°F | 60°F | 71.6°F | – | 6 | <1 | 11 h 30 min |
| November | 74°F | 51°F | 62.6°F | – | 1 | 1 | 10 h 40 min |
| December | 66°F | 44°F | 55.0°F | – | <1 | 4 | 10 h 20 min |
| Year (annual) | 81°F | 59°F | 70.2°F | – | 120 | 11 |
The same normals in °C and millimetres
| Month | High | Low | Mean |
|---|---|---|---|
| January | 18°C | 6°C | 12.0°C |
| February | 20°C | 8°C | 13.9°C |
| March | 23°C | 11°C | 17.3°C |
| April | 28°C | 15°C | 21.2°C |
| May | 31°C | 19°C | 25.0°C |
| June | 34°C | 22°C | 28.1°C |
| July | 35°C | 23°C | 29.3°C |
| August | 36°C | 23°C | 29.5°C |
| September | 33°C | 21°C | 26.6°C |
| October | 28°C | 16°C | 22.0°C |
| November | 23°C | 11°C | 17.0°C |
| December | 19°C | 7°C | 12.8°C |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00414696; annual normals. Wet days: 0.01 inch or more; 90°F days and freezing nights: NOAA's day counts. Daylight: sunrise to sunset on the 15th, computed from the latitude.
When is the best weather to visit Karnes City?
Normal highs sit between 65°F and 85°F in February, March, April, October, November and December.
That is a measurement, not a recommendation: it counts the months whose normal afternoon high sits between 65°F and 85°F, where a light layer is enough by day.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00414696.
When is the last frost in Karnes City?
In Karnes City, the last spring frost (32°F) comes after February 16 in half of years and after March 13 in one year in ten; the first autumn frost comes before December 9 in half of years and before November 20 in one year in ten.
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- February 161 year in 10 after March 13; 9 in 10 after January 13
- First autumn frost, half of years before
- December 91 year in 10 before November 20; 9 in 10 before January 10
NOAA puts the median frost-free season at 300 days, and the season without a hard freeze (28°F) at 337 days.
A hard freeze (28°F) comes after January 28 in half of springs and before December 27 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Karnes City in zone 9a in ZIP code 78118, the nearest ZIP area.
Frost dates for every NOAA station in Texas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00414696; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026. A 10% date means one year in ten has a frost after it in spring or before it in autumn.
How hot and how cold does it get in Karnes City?
In a normal year in Karnes City, 120 days a year reach 90°F (21 of them 100°F or more) and 11 nights fall to 32°F or colder.
- Days at 90°F or more
- 120a normal year
- Days at 100°F or more
- 21a normal year
- Nights at 32°F or colder
- 11a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
Source: NOAA NCEI 1991-2020 annual normals, station USC00414696.
How sunny is Karnes City?
Over a year 79% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Karnes City, 4.8 kWh per square metre a day. August is the sunniest month (87%) and February the cloudiest (68%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 70% | 3.0 |
| February | 68% | 3.5 |
| March | 71% | 4.5 |
| April | 74% | 5.3 |
| May | 79% | 6.0 |
| June | 85% | 6.7 |
| July | 86% | 6.6 |
| August | 87% | 6.3 |
| September | 81% | 5.2 |
| October | 83% | 4.5 |
| November | 77% | 3.4 |
| December | 70% | 2.8 |
Source: NASA POWER solar climatology, 2001-2020 (CERES SYN1deg). Satellite-based, for the 1-degree cell (about 100 km across) around the station, so it describes the area rather than the airport.
How much heating and cooling does Karnes City need?
A normal year in Karnes City brings 1,295 heating degree days, 76% fewer than the median U.S. place (5,373), and 3,218 cooling degree days, 3.5 times the median (908). Two months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 7,588 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 365 | 14 |
| February | 249 | 26 |
| March | 133 | 74 |
| April | 30 | 185 |
| May | 3 | 374 |
| June | 0 | 529 |
| July | 0 | 611 |
| August | 0 | 623 |
| September | 1 | 450 |
| October | 31 | 235 |
| November | 150 | 77 |
| December | 333 | 22 |
| Year (annual) | 1,295 | 3,218 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00414696. A degree day is one degree of a day's mean temperature below 65°F (heating) or above it (cooling); utilities use them to estimate energy use.
How does Karnes City's climate compare?
Karnes City is warmer than 258 of the other 320 places with their own NOAA record in Texas. Across the 7,247 U.S. stations with normals, its annual mean of 70.2°F is warmer than 95%.
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers.
Which places near Karnes City share this climate record?
4 places have no NOAA station with 1991-2020 normals of their own, and this station is the nearest full record. A place's own climate can differ from these figures, by several degrees where it sits much higher or lower than the station, nearer the coast, or inside a large city's heat; for the larger places the next nearest records are named with their yearly mean, so the spread around them is visible, and places of 50,000 or more have their own page with NOAA's gridded normals.
- Kenedy, TX3,378 people · 7 mi S
- Runge, TX960 people · 10 mi E
- Falls City, TX513 people · 10 mi NW
- Nordheim, TX345 people · 16 mi E
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
Questions about Karnes City's climate
What is the coldest month in Karnes City?
January, with a normal high of 65°F and a normal low of 43°F. The warmest is August (97°F by day, 73°F at night).
What plant hardiness zone is Karnes City in?
The USDA's 2023 map puts Karnes City in zone 9a in ZIP code 78118, the nearest ZIP area.
How late can frost come in Karnes City?
In half of years the last 32°F night comes after February 16; in one year in ten it comes after March 13. Waiting until March 13 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Floresville, TX24 miles from this station, 69.6°F a year
- Nixon, TX27 miles from this station, 68.8°F a year
- Beeville, TX33 miles from this station, 70.6°F a year
- Goliad, TX34 miles from this station, 70.7°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made