Crystal City, Texas climate: Normal weather by month, frost dates and records
Crystal City's normal year runs from 44°F January nights to 99°F August afternoons, with 19.5 inches of precipitation a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 22.6°C, January lows of 7°C, August highs of 37°C, 494 mm of precipitation a year.
- NOAA stationCrystal City
- Station IDUSC00412160
- Location28.68°N 99.83°W
- Elevation580 ft (177 m)
- Population6,009
On October 23, the normal high in Crystal City is 83°F and the normal low 62°F, and the chance of measurable rain or snow is 16%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Crystal City.
- Jan 67° 44°
- Feb 72° 49°
- Mar 79° 55°
- Apr 86° 62°
- May 91° 70°
- Jun 96° 75°
- Jul 97° 76°
- Aug 99° 76°
- Sep 93° 72°
- Oct 85° 64°
- Nov 74° 53°
- Dec 68° 45°
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 Crystal City each month?
August is the warmest month, with normal highs of 99°F; January the coldest, with normal lows of 44°F. The most precipitation falls in September (2.43 in), the least in December (0.84 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 67°F | 44°F | 55.3°F | 1.04 | 6 | <1 | 3 | 10 h 30 min |
| February | 72°F | 49°F | 60.3°F | 0.85 | 5 | 1 | 1 | 11 h 10 min |
| March | 79°F | 55°F | 67.0°F | 1.70 | 5 | 3 | 1 | 12 h |
| April | 86°F | 62°F | 74.0°F | 1.31 | 5 | 10 | <1 | 12 h 50 min |
| May | 91°F | 70°F | 80.3°F | 2.23 | 5 | 20 | <1 | 13 h 30 min |
| June | 96°F | 75°F | 85.5°F | 2.07 | 5 | 28 | <1 | 14 h |
| July | 97°F | 76°F | 86.4°F | 2.07 | 5 | 29 | <1 | 13 h 50 min |
| August | 99°F | 76°F | 87.4°F | 1.92 | 4 | 30 | <1 | 13 h 10 min |
| September | 93°F | 72°F | 82.2°F | 2.43 | 6 | 24 | <1 | 12 h 20 min |
| October | 85°F | 64°F | 74.3°F | 2.00 | 5 | 10 | <1 | 11 h 30 min |
| November | 74°F | 53°F | 63.7°F | 1.00 | 5 | <1 | 1 | 10 h 40 min |
| December | 68°F | 45°F | 56.4°F | 0.84 | 5 | <1 | 3 | 10 h 20 min |
| Year (annual) | 84°F | 62°F | 72.7°F | 19.46 | 60 | 154 | 8 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 19°C | 7°C | 12.9°C | 26 mm |
| February | 22°C | 9°C | 15.7°C | 22 mm |
| March | 26°C | 13°C | 19.4°C | 43 mm |
| April | 30°C | 17°C | 23.3°C | 33 mm |
| May | 33°C | 21°C | 26.8°C | 57 mm |
| June | 36°C | 24°C | 29.7°C | 53 mm |
| July | 36°C | 24°C | 30.2°C | 53 mm |
| August | 37°C | 24°C | 30.8°C | 49 mm |
| September | 34°C | 22°C | 27.9°C | 62 mm |
| October | 29°C | 18°C | 23.5°C | 51 mm |
| November | 23°C | 12°C | 17.6°C | 25 mm |
| December | 20°C | 7°C | 13.6°C | 21 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00412160; 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 Crystal City?
Normal highs sit between 65°F and 85°F in January, February, March, October, November and December. Of those, November has the fewest days with rain (5).
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 USC00412160.
When is the last frost in Crystal City?
In Crystal City, the last spring frost (32°F) comes after February 10 in half of years and after March 9 in one year in ten; the first autumn frost comes before December 10 in half of years and before November 19 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 101 year in 10 after March 9; 9 in 10 after January 6
- First autumn frost, half of years before
- December 101 year in 10 before November 19; 9 in 10 before January 9
NOAA puts the median frost-free season at 307 days, and the season without a hard freeze (28°F) at 346 days.
A hard freeze (28°F) comes after January 20 in half of springs and before December 26 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Crystal City in zone 9a in ZIP code 78839, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Crystal City's NOAA station is in zone 9b: the coldest night of a typical year reaches 26°F (18 complete years); the map interpolates between stations and terrain, so the station and the ZIP area can differ by half a zone.
Frost dates for every NOAA station in Texas · Frost dates by ZIP code
Source: NOAA NCEI 1991-2020 annual normals (frost probabilities), station USC00412160; 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 in Crystal City?
In a normal year in Crystal City, 154 days a year reach 90°F (43 of them 100°F or more), 8 nights fall to 32°F or colder and 60 days bring measurable precipitation.
- Days at 90°F or more
- 154a normal year
- Days at 100°F or more
- 43a normal year
- Nights at 32°F or colder
- 8a normal year
- Days that stay below freezing
- fewer than 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 1948) is 115°F, on September 5, 2000; the lowest is 11°F, on January 12, 1962.
The wettest calendar year on that record is 1976, with 34.76 in; the snowiest season is 1965–66, with 2.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00412160; records: ACIS (NOAA Regional Climate Centers), station USC00412160. Records use complete months only; a month missing more than three days is left out.
How sunny is Crystal City?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Crystal City, 5.0 kWh per square metre a day. August is the sunniest month (91%) and February the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 73% | 3.2 |
| February | 72% | 3.8 |
| March | 74% | 4.7 |
| April | 77% | 5.6 |
| May | 79% | 6.0 |
| June | 87% | 6.9 |
| July | 88% | 6.8 |
| August | 91% | 6.6 |
| September | 83% | 5.3 |
| October | 83% | 4.6 |
| November | 77% | 3.5 |
| December | 73% | 2.9 |
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 Crystal City need?
A normal year in Crystal City brings 990 heating degree days, 82% fewer than the median U.S. place (5,373), and 3,838 cooling degree days, 4.2 times the median (908). One month needs 300 or more heating degree days, a monthly mean of about 55°F or colder. For gardens and crops, NOAA counts 8,406 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 310 | 12 |
| February | 171 | 41 |
| March | 73 | 135 |
| April | 13 | 281 |
| May | 1 | 476 |
| June | 0 | 615 |
| July | 0 | 664 |
| August | 0 | 696 |
| September | 0 | 516 |
| October | 16 | 304 |
| November | 122 | 81 |
| December | 285 | 18 |
| Year (annual) | 990 | 3,838 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00412160. 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 Crystal City's climate compare?
Crystal City is warmer than 298 of the other 320 places with their own NOAA record in Texas, and wetter than 50. Across the 7,247 U.S. stations with normals, its annual mean of 72.7°F is warmer than 97%.
In the Köppen classification computed from these normals, Crystal City is BSh: hot 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.
Which places near Crystal City share this climate record?
8 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.
- Uvalde Estates, TX2,168 people · 34 mi N
- La Pryor, TX1,130 people · 19 mi N
- Batesville, TX1,033 people · 22 mi NE
- Big Wells, TX455 people · 18 mi SE
- Loma Grande, TX336 people · 3 mi N
- Chula Vista, TX245 people · 2 mi SE
- Amaya, TX0 people · 2 mi N
- Brundage, TX0 people · 12 mi SE
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 Crystal City's climate
What is the coldest month in Crystal City?
January, with a normal high of 67°F and a normal low of 44°F. The warmest is August (99°F by day, 76°F at night).
Does it snow in Crystal City?
Rarely: NOAA's normal is no measurable snow a year.
What is the rainiest month in Crystal City?
September, with 2.43 in of precipitation in a normal year; the driest is December with 0.84 in.
What plant hardiness zone is Crystal City in?
The USDA's 2023 map puts Crystal City in zone 9a in ZIP code 78839, the nearest ZIP area. By the same method at Crystal City's NOAA station, the coldest night of a typical year reaches 26°F (18 years, 1991-2020): zone 9b.
How late can frost come in Crystal City?
In half of years the last 32°F night comes after February 10; in one year in ten it comes after March 9. Waiting until March 9 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Carrizo Springs, TX14 miles from this station, 70.6°F a year
- Dilley, TX39 miles from this station, 71.0°F a year
- Eagle Pass, TX40 miles from this station, 70.2°F a year
- Cotulla, TX40 miles from this station, 73.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made