Dilley, Texas climate: Normal weather by month, frost dates and records
Dilley's normal year runs from 42°F January nights to 98°F August afternoons, with 25.0 inches of precipitation and less than an inch of snow (0.2 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 21.7°C, January lows of 5°C, August highs of 37°C, 635 mm of precipitation a year.
- NOAA stationDilley
- Station IDUSC00412458
- Location28.68°N 99.18°W
- Elevation550 ft (168 m)
- Population3,953
On October 23, the normal high in Dilley is 83°F and the normal low 59°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 Dilley.
- Jan 66° 42°
- Feb 70° 46°
- Mar 77° 53°
- Apr 84° 59°
- May 90° 67°
- Jun 96° 72°
- Jul 97° 74°
- Aug 98° 74°
- Sep 92° 70°
- Oct 85° 61°
- Nov 73° 51°
- Dec 66° 43°
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 Dilley each month?
August is the warmest month, with normal highs of 98°F; January the coldest, with normal lows of 42°F. The most precipitation falls in May (4.02 in), the least in January (1.15 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 66°F | 42°F | 53.7°F | 1.15 | 5 | <1 | 3 | 10 h 30 min |
| February | 70°F | 46°F | 58.0°F | 1.24 | 5 | 1 | 1 | 11 h 10 min |
| March | 77°F | 53°F | 64.8°F | 1.98 | 6 | 2 | 1 | 12 h |
| April | 84°F | 59°F | 71.7°F | 1.47 | 4 | 7 | <1 | 12 h 50 min |
| May | 90°F | 67°F | 78.7°F | 4.02 | 6 | 17 | <1 | 13 h 30 min |
| June | 96°F | 72°F | 83.8°F | 2.46 | 5 | 26 | <1 | 14 h |
| July | 97°F | 74°F | 85.4°F | 2.22 | 4 | 29 | <1 | 13 h 50 min |
| August | 98°F | 74°F | 85.9°F | 1.96 | 4 | 29 | <1 | 13 h 10 min |
| September | 92°F | 70°F | 80.6°F | 3.70 | 7 | 20 | <1 | 12 h 20 min |
| October | 85°F | 61°F | 72.6°F | 2.16 | 5 | 9 | <1 | 11 h 30 min |
| November | 73°F | 51°F | 62.1°F | 1.42 | 5 | 1 | 1 | 10 h 40 min |
| December | 66°F | 43°F | 54.6°F | 1.23 | 6 | <1 | 4 | 10 h 20 min |
| Year (annual) | 83°F | 59°F | 71.0°F | 25.01 | 61 | 140 | 10 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 19°C | 5°C | 12.1°C | 29 mm |
| February | 21°C | 8°C | 14.4°C | 31 mm |
| March | 25°C | 12°C | 18.2°C | 50 mm |
| April | 29°C | 15°C | 22.1°C | 37 mm |
| May | 32°C | 20°C | 25.9°C | 102 mm |
| June | 35°C | 22°C | 28.8°C | 62 mm |
| July | 36°C | 23°C | 29.7°C | 56 mm |
| August | 37°C | 23°C | 29.9°C | 50 mm |
| September | 33°C | 21°C | 27.0°C | 94 mm |
| October | 29°C | 16°C | 22.6°C | 55 mm |
| November | 23°C | 11°C | 16.7°C | 36 mm |
| December | 19°C | 6°C | 12.6°C | 31 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00412458; 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 Dilley?
Normal highs sit between 65°F and 85°F in January, February, March, April, October, November and December. Of those, April has the fewest days with rain (4).
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 USC00412458.
When is the last frost in Dilley?
In Dilley, the last spring frost (32°F) comes after February 16 in half of years and after March 12 in one year in ten; the first autumn frost comes before December 6 in half of years and before November 16 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 12; 9 in 10 after January 14
- First autumn frost, half of years before
- December 61 year in 10 before November 16; 9 in 10 before January 3
NOAA puts the median frost-free season at 296 days, and the season without a hard freeze (28°F) at 336 days.
A hard freeze (28°F) comes after January 26 in half of springs and before December 23 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Dilley in zone 9a in ZIP code 78017, 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 USC00412458; 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 Dilley?
In a normal year in Dilley, 140 days a year reach 90°F (29 of them 100°F or more), 10 nights fall to 32°F or colder and 61 days bring measurable precipitation.
- Days at 90°F or more
- 140a normal year
- Days at 100°F or more
- 29a normal year
- Nights at 32°F or colder
- 10a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 61a normal year
The highest temperature in this station's record (since 1916) is 111°F, on July 9, 1939; the lowest is 9°F, on January 13, 1962.
The wettest calendar year on that record is 2004, with 42.61 in; the snowiest season is 1925–26, with 6.7 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00412458; records: ACIS (NOAA Regional Climate Centers), station USC00412458. Records use complete months only; a month missing more than three days is left out.
How sunny is Dilley?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Dilley, 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 Dilley need?
A normal year in Dilley brings 1,243 heating degree days, 77% fewer than the median U.S. place (5,373), and 3,456 cooling degree days, 3.8 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 7,844 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 361 | 11 |
| February | 224 | 29 |
| March | 109 | 103 |
| April | 24 | 227 |
| May | 1 | 426 |
| June | 0 | 564 |
| July | 0 | 632 |
| August | 0 | 648 |
| September | 1 | 469 |
| October | 27 | 261 |
| November | 158 | 73 |
| December | 339 | 15 |
| Year (annual) | 1,243 | 3,456 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00412458. 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 Dilley's climate compare?
Dilley is warmer than 275 of the other 320 places with their own NOAA record in Texas, and wetter than 109. Across the 7,247 U.S. stations with normals, its annual mean of 71.0°F is warmer than 96%.
In the Köppen classification computed from these normals, Dilley is Cfa: temperate, no dry season, hot summer. 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 Dilley share this climate record?
3 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.
- Pearsall, TX9,541 people · 16 mi N
- Hilltop, TX565 people · 1 mi NE
- North Pearsall, TX396 people · 17 mi N
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 Dilley's climate
What is the coldest month in Dilley?
January, with a normal high of 66°F and a normal low of 42°F. The warmest is August (98°F by day, 74°F at night).
Does it snow in Dilley?
Rarely: NOAA's normal is 0.2 inch a year.
What is the rainiest month in Dilley?
May, with 4.02 in of precipitation in a normal year; the driest is January with 1.15 in.
What plant hardiness zone is Dilley in?
The USDA's 2023 map puts Dilley in zone 9a in ZIP code 78017, the nearest ZIP area.
How late can frost come in Dilley?
In half of years the last 32°F night comes after February 16; in one year in ten it comes after March 12. Waiting until March 12 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Cotulla, TX16 miles from this station, 73.0°F a year
- Fowlerton, TX24 miles from this station, 71.0°F a year
- Charlotte, TX31 miles from this station, 72.3°F a year
- Cross, TX39 miles from this station, 70.8°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made