Chisos Basin, Texas climate: Climate normals at a NOAA weather station
Chisos Basin's normal year runs from 38°F January nights to 87°F June afternoons, with 18.3 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 17.2°C, January lows of 3°C, June highs of 31°C, 466 mm of precipitation a year.
- NOAA stationChisos Basin
- Station IDUSC00411715
- Location29.27°N 103.30°W
- Elevation5,300 ft (1,615 m)
On October 23, the normal high in Chisos Basin is 73°F and the normal low 52°F, and the chance of measurable rain or snow is 14%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Chisos Basin.
- Jan 58° 38°
- Feb 63° 41°
- Mar 69° 46°
- Apr 76° 52°
- May 83° 60°
- Jun 87° 65°
- Jul 85° 65°
- Aug 84° 65°
- Sep 79° 60°
- Oct 74° 54°
- Nov 65° 45°
- Dec 59° 39°
Each month: normal high (large) and low, °F. Fill: the month's normal mean, colder blue to hotter red.
What is the weather like at Chisos Basin each month?
June is the warmest month, with normal highs of 87°F; January the coldest, with normal lows of 38°F. The most precipitation falls in July (3.57 in), the least in December (0.46 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 58°F | 38°F | 48.0°F | 0.58 | 3 | <1 | 9 | 10 h 30 min |
| February | 63°F | 41°F | 51.7°F | 0.61 | 3 | <1 | 6 | 11 h 10 min |
| March | 69°F | 46°F | 57.1°F | 0.50 | 2 | <1 | 2 | 12 h |
| April | 76°F | 52°F | 64.3°F | 0.59 | 3 | <1 | 1 | 12 h 50 min |
| May | 83°F | 60°F | 71.6°F | 1.58 | 5 | 5 | <1 | 13 h 40 min |
| June | 87°F | 65°F | 75.9°F | 2.74 | 7 | 9 | <1 | 14 h |
| July | 85°F | 65°F | 74.9°F | 3.57 | 9 | 4 | <1 | 13 h 50 min |
| August | 84°F | 65°F | 74.2°F | 3.06 | 9 | 3 | <1 | 13 h 10 min |
| September | 79°F | 60°F | 69.5°F | 2.72 | 7 | <1 | <1 | 12 h 20 min |
| October | 74°F | 54°F | 63.8°F | 1.29 | 5 | <1 | 1 | 11 h 30 min |
| November | 65°F | 45°F | 54.9°F | 0.63 | 4 | <1 | 3 | 10 h 40 min |
| December | 59°F | 39°F | 48.9°F | 0.46 | 3 | <1 | 8 | 10 h 20 min |
| Year (annual) | 74°F | 52°F | 62.9°F | 18.33 | 60 | 22 | 29 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 15°C | 3°C | 8.9°C | 15 mm |
| February | 17°C | 5°C | 10.9°C | 15 mm |
| March | 20°C | 8°C | 13.9°C | 13 mm |
| April | 25°C | 11°C | 17.9°C | 15 mm |
| May | 28°C | 16°C | 22.0°C | 40 mm |
| June | 31°C | 18°C | 24.4°C | 70 mm |
| July | 29°C | 18°C | 23.8°C | 91 mm |
| August | 29°C | 18°C | 23.4°C | 78 mm |
| September | 26°C | 16°C | 20.8°C | 69 mm |
| October | 23°C | 12°C | 17.7°C | 33 mm |
| November | 18°C | 7°C | 12.7°C | 16 mm |
| December | 15°C | 4°C | 9.4°C | 12 mm |
NOAA publishes no 1991-2020 snowfall normal for this station. The nearest record that keeps one, Panther Junction (7 miles away), gets 0 inches of snow in a normal year; elevation and distance can change that.
Source: NOAA NCEI 1991-2020 monthly normals, station USC00411715; 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.
Which months are mildest at Chisos Basin?
Normal highs sit between 65°F and 85°F in March, April, May, July, August, September, October and November. Of those, March has the fewest days with rain (2).
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 USC00411715.
When is the last frost at Chisos Basin?
In Chisos Basin, the last spring frost (32°F) comes after March 10 in half of years and after April 6 in one year in ten; the first autumn frost comes before November 19 in half of years and before October 29 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
- March 101 year in 10 after April 6; 9 in 10 after February 12
- First autumn frost, half of years before
- November 191 year in 10 before October 29; 9 in 10 before December 9
NOAA puts the median frost-free season at 252 days, and the season without a hard freeze (28°F) at 285 days.
A hard freeze (28°F) comes after February 21 in half of springs and before December 2 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Chisos Basin in zone 8b in ZIP code 79834, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, the station is in zone 8b: the coldest night of a typical year reaches 18°F (21 complete years).
Frost dates for every NOAA station in Texas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00411715; USDA 2023 Plant Hardiness Zone Map, ZIP listings: PRISM Group, Oregon State University, https://prism.oregonstate.edu, accessed October 8, 2026; the station zone: ACIS daily lows, 1991-2020. 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 at Chisos Basin?
In a normal year in Chisos Basin, 22 days a year reach 90°F, 29 nights fall to 32°F or colder and 60 days bring measurable precipitation.
- Days at 90°F or more
- 22a normal year
- Days at 100°F or more
- fewer than 1a normal year
- Nights at 32°F or colder
- 29a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 60a normal year
The highest temperature in this station's record (since 1947) is 103°F, on June 28, 1972; the lowest is −3°F, on January 30, 1949.
The wettest calendar year on that record is 1986, with 33.68 in; the snowiest season is 2020–21, with 30.5 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00411715; records: ACIS (NOAA Regional Climate Centers), station USC00411715. Records use complete months only; a month missing more than three days is left out.
How sunny is it at Chisos Basin?
Over a year 89% of the sunlight that would reach the ground under clear skies gets through the clouds at Chisos Basin, 5.7 kWh per square metre a day. June is the sunniest month (92%) and January the cloudiest (85%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 85% | 3.8 |
| February | 87% | 4.8 |
| March | 89% | 6.0 |
| April | 90% | 7.0 |
| May | 91% | 7.5 |
| June | 92% | 7.6 |
| July | 87% | 7.0 |
| August | 88% | 6.6 |
| September | 87% | 5.7 |
| October | 90% | 5.1 |
| November | 89% | 4.1 |
| December | 87% | 3.6 |
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 many heating and cooling degree days does Chisos Basin record?
A normal year at Chisos Basin brings 2,198 heating degree days, 59% fewer than the median U.S. place (5,373), and 1,456 cooling degree days, 60% more than the median (908). Four months need 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 5,153 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 527 | 0 |
| February | 375 | 3 |
| March | 258 | 15 |
| April | 95 | 75 |
| May | 20 | 224 |
| June | 1 | 326 |
| July | 0 | 307 |
| August | 1 | 287 |
| September | 18 | 153 |
| October | 96 | 59 |
| November | 309 | 6 |
| December | 498 | 0 |
| Year (annual) | 2,198 | 1,456 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00411715. 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.
Have recent years at Chisos Basin been warmer than normal?
2025 averaged 65.2°F, 2.3°F above the 1991-2020 normal of 62.9°F. 5 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 63.5°F | +0.6°F | 20.24 |
| 2022 | 63.1°F | +0.2°F | 13.01 |
| 2023 | 64.7°F | +1.8°F | 15.89 |
| 2024 | 65.4°F | +2.5°F | 6.80 |
| 2025 | 65.2°F | +2.3°F | 11.84 |
Over 49 complete years from 1950 to 2025, the station's annual mean temperature rose at a fitted 3.6°F per century (+0.20°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00411715; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Chisos Basin's climate compare?
Chisos Basin is warmer than 57 of the 321 places with their own NOAA record in Texas, and wetter than 37. Across the 7,247 U.S. stations with normals, its annual mean of 62.9°F is warmer than 82%.
In the Köppen classification computed from these normals, Chisos Basin is BSk: cold semi-arid steppe. What the classes mean.
Places with the most similar year elsewhere
Measured month by month on the normal high, low and precipitation, among places of 20,000 or more people in other states:
Source: NOAA NCEI 1991-2020 normals for every station PlainClimate covers. Similarity: the root-mean-square difference of the 36 monthly figures, precipitation weighted so an inch counts like 6°F.
Questions about Chisos Basin's climate
What is the coldest month at Chisos Basin?
January, with a normal high of 58°F and a normal low of 38°F. The warmest is June (87°F by day, 65°F at night).
Does it snow at Chisos Basin?
Rarely. NOAA publishes no 1991-2020 snowfall normal for the station; the nearest record that keeps one, Panther Junction (7 miles away), records 0 inches of snow in a normal year.
What is the rainiest month at Chisos Basin?
July, with 3.57 in of precipitation in a normal year; the driest is December with 0.46 in.
What plant hardiness zone is Chisos Basin in?
The USDA's 2023 map puts Chisos Basin in zone 8b in ZIP code 79834, the nearest ZIP area. By the same method at the station, the coldest night of a typical year reaches 18°F (21 years, 1991-2020): zone 8b.
How late can frost come at Chisos Basin?
In half of years the last 32°F night comes after March 10; in one year in ten it comes after April 6. Waiting until April 6 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Panther Junction, TX7 miles from this station, 66.4°F a year
- Panther Junction (2 mi N), TX7 miles from this station, 67.3°F a year
- Study Butte, TX16 miles from this station, 71.1°F a year
- Castolon, TX16 miles from this station, 72.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made