Del Rio, Texas climate: Normal weather by month, frost dates and records
Del Rio's normal year runs from 44°F January nights to 101°F August afternoons, with 19.8 inches of precipitation and less than an inch of snow (0.1 in) a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 23.3°C, January lows of 6°C, August highs of 38°C, 503 mm of precipitation a year.
- NOAA stationDel Rio International Airport
- Station IDUSW00022010
- Location29.38°N 100.93°W
- Elevation999 ft (305 m)
- Population34,678
On October 23, the normal high in Del Rio is 84°F and the normal low 62°F, and the chance of measurable rain or snow is 18%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Del Rio.
- Jan 68° 44°
- Feb 73° 48°
- Mar 80° 56°
- Apr 87° 63°
- May 93° 71°
- Jun 98° 77°
- Jul 100° 79°
- Aug 101° 79°
- Sep 94° 73°
- Oct 86° 64°
- Nov 75° 53°
- Dec 68° 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 Del Rio each month?
August is the warmest month, with normal highs of 101°F; January the coldest, with normal lows of 44°F. The most precipitation falls in May (3.06 in), the least in January (0.61 in).
Each month has its own page with the day-by-day normals, the month's records and its recent years:
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 68°F | 44°F | 55.6°F | 0.61 | 4 | <1 | 4 | 10 h 30 min |
| February | 73°F | 48°F | 60.5°F | 0.63 | 5 | 1 | 2 | 11 h 10 min |
| March | 80°F | 56°F | 68.1°F | 1.18 | 5 | 3 | 1 | 12 h |
| April | 87°F | 63°F | 74.9°F | 1.50 | 5 | 8 | <1 | 12 h 50 min |
| May | 93°F | 71°F | 82.1°F | 3.06 | 7 | 18 | <1 | 13 h 40 min |
| June | 98°F | 77°F | 87.7°F | 2.32 | 5 | 27 | <1 | 14 h |
| July | 100°F | 79°F | 89.5°F | 1.48 | 4 | 29 | <1 | 13 h 50 min |
| August | 101°F | 79°F | 89.9°F | 2.69 | 4 | 29 | <1 | 13 h 10 min |
| September | 94°F | 73°F | 83.5°F | 2.63 | 6 | 21 | <1 | 12 h 20 min |
| October | 86°F | 64°F | 74.8°F | 2.08 | 6 | 7 | <1 | 11 h 30 min |
| November | 75°F | 53°F | 63.7°F | 0.91 | 4 | <1 | 1 | 10 h 40 min |
| December | 68°F | 44°F | 56.1°F | 0.70 | 4 | <1 | 4 | 10 h 20 min |
| Year (annual) | 85°F | 63°F | 73.9°F | 19.79 | 59 | 141 | 12 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 20°C | 6°C | 13.1°C | 15 mm |
| February | 23°C | 9°C | 15.8°C | 16 mm |
| March | 27°C | 13°C | 20.1°C | 30 mm |
| April | 31°C | 17°C | 23.8°C | 38 mm |
| May | 34°C | 22°C | 27.8°C | 78 mm |
| June | 37°C | 25°C | 30.9°C | 59 mm |
| July | 38°C | 26°C | 31.9°C | 38 mm |
| August | 38°C | 26°C | 32.2°C | 68 mm |
| September | 34°C | 23°C | 28.6°C | 67 mm |
| October | 30°C | 18°C | 23.8°C | 53 mm |
| November | 24°C | 11°C | 17.6°C | 23 mm |
| December | 20°C | 7°C | 13.4°C | 18 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00022010; 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 Del Rio?
Normal highs sit between 65°F and 85°F in January, February, March, November and December. Of those, January 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 USW00022010.
When is the last frost in Del Rio?
In Del Rio, the last spring frost (32°F) comes after February 16 in half of years and after March 10 in one year in ten; the first autumn frost comes before December 3 in half of years and before November 14 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 10; 9 in 10 after January 19
- First autumn frost, half of years before
- December 31 year in 10 before November 14; 9 in 10 before December 26
NOAA puts the median frost-free season at 293 days, and the season without a hard freeze (28°F) at 329 days.
A hard freeze (28°F) comes after January 24 in half of springs and before December 18 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Del Rio in zone 9a in ZIP code 78843, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Del Rio's NOAA station is in zone 9a: the coldest night of a typical year reaches 24°F (30 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 USW00022010; 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 Del Rio?
In a normal year in Del Rio, 141 days a year reach 90°F (41 of them 100°F or more), 12 nights fall to 32°F or colder and 59 days bring measurable precipitation.
- Days at 90°F or more
- 141a normal year
- Days at 100°F or more
- 41a normal year
- Nights at 32°F or colder
- 12a normal year
- Days that stay below freezing
- fewer than 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 59a normal year
The highest temperature in Del Rio's official record (kept by the National Weather Service since 1905) is 115°F, on June 21, 2023; the lowest is 10°F, on December 23, 1989.
The wettest calendar year on that record is 1914, with 37.75 in; the snowiest season is 2020–21, with 13.6 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USW00022010; records: ACIS (NOAA Regional Climate Centers), NWS threaded record DRTthr. Records use complete months only; a month missing more than three days is left out.
How humid and windy is Del Rio, and how clear are its skies?
The summer (June-August) dew point averages 66°F. The muggiest month is June, with an average dew point of 67°F, above the 65°F at which most people call the air sticky; the driest air comes in December (36°F). May is the windiest month (10.1 mph on average), and July has the most clear or nearly clear hours (90%).
| Month | Dew point | Humidity | Afternoon humidity | Wind | Clear or few clouds | Overcast |
|---|---|---|---|---|---|---|
| January | 37°F | 55% | 35% | 7.4 mph | 76% | 20% |
| February | 40°F | 49% | 31% | 8.6 mph | 78% | 17% |
| March | 50°F | 53% | 35% | 9.4 mph | 77% | 16% |
| April | 56°F | 52% | 34% | 9.9 mph | 77% | 14% |
| May | 65°F | 58% | 40% | 10.1 mph | 84% | 7% |
| June | 67°F | 56% | 38% | 9.9 mph | 82% | 7% |
| July | 66°F | 51% | 34% | 9.2 mph | 90% | 3% |
| August | 66°F | 56% | 38% | 7.9 mph | 84% | 6% |
| September | 61°F | 59% | 40% | 7.8 mph | 82% | 9% |
| October | 51°F | 60% | 41% | 7.8 mph | 76% | 16% |
| November | 41°F | 59% | 39% | 7.0 mph | 75% | 20% |
| December | 36°F | 57% | 37% | 7.1 mph | 64% | 30% |
Source: NOAA NCEI 1991-2020 hourly normals, station USW00022010. Monthly averages of all hours; afternoon humidity at 3 p.m. local standard time; sky as the share of hours NOAA's observations rate clear or few clouds (a dash where NOAA publishes no sky value).
How sunny is Del Rio?
Over a year 80% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Del Rio, 5.0 kWh per square metre a day. August is the sunniest month (89%) and February the cloudiest (75%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 75% | 3.3 |
| February | 75% | 4.0 |
| March | 75% | 4.8 |
| April | 77% | 5.7 |
| May | 76% | 5.9 |
| June | 85% | 6.8 |
| July | 87% | 6.8 |
| August | 89% | 6.5 |
| September | 82% | 5.3 |
| October | 81% | 4.4 |
| November | 77% | 3.4 |
| December | 76% | 3.0 |
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 Del Rio need?
A normal year in Del Rio brings 970 heating degree days, 82% fewer than the median U.S. place (5,373), and 4,233 cooling degree days, 4.7 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 8,820 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 303 | 10 |
| February | 167 | 42 |
| March | 62 | 158 |
| April | 10 | 307 |
| May | 0 | 530 |
| June | 0 | 681 |
| July | 0 | 761 |
| August | 0 | 772 |
| September | 1 | 557 |
| October | 15 | 320 |
| November | 122 | 82 |
| December | 291 | 14 |
| Year (annual) | 970 | 4,233 |
Source: NOAA NCEI 1991-2020 monthly normals, station USW00022010. 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.
Has Del Rio been warmer than normal lately?
2025 averaged 74.3°F, 0.4°F above the 1991-2020 normal of 73.9°F. 4 of the 5 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 74.2°F | +0.3°F | 16.38 |
| 2022 | 72.9°F | −1.0°F | 15.99 |
| 2023 | 75.4°F | +1.5°F | 15.07 |
| 2024 | 76.3°F | +2.4°F | 10.56 |
| 2025 | 74.3°F | +0.4°F | 7.61 |
Over 66 complete years from 1949 to 2025, the station's annual mean temperature rose at a fitted 2.4°F per century (+0.14°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USW00022010; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Del Rio's climate compare?
Del Rio is warmer than 307 of the other 320 places with their own NOAA record in Texas, and wetter than 54. Across the 7,247 U.S. stations with normals, its annual mean of 73.9°F is warmer than 98%.
In the Köppen classification computed from these normals, Del Rio 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 Del Rio 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.
- Val Verde Park, TX3,197 people · 6 mi E
- Laughlin AFB, TX1,888 people · 9 mi E
- Cienegas Terrace, TX1,703 people · 1 mi SW
Source: Census Bureau 2024 Gazetteer (place centers) and Vintage 2024 population estimates. Distance and direction from the station to each place's center.
What do Del Rio's other NOAA stations record?
One more NOAA station keeps 1991-2020 normals in or near Del Rio. This page uses Del Rio International Airport; the other differs by site and elevation:
| Station | From this station | Elevation | Year | Jan low | Jul high | Precip. | Snow | Last frost |
|---|---|---|---|---|---|---|---|---|
| Del Rio (4 mi NW) USC00412361 | 2 mi N | 1,051 ft | 70.4°F | 39°F | 98°F | 20.8 | 0 | February 19 |
Source: NOAA NCEI 1991-2020 normals for each station. Last frost: the median last spring date of 32°F.
Questions about Del Rio's climate
What is the coldest month in Del Rio?
January, with a normal high of 68°F and a normal low of 44°F. The warmest is August (101°F by day, 79°F at night).
Does it snow in Del Rio?
Rarely: NOAA's normal is 0.1 inch a year.
What is the rainiest month in Del Rio?
May, with 3.06 in of precipitation in a normal year; the driest is January with 0.61 in.
What plant hardiness zone is Del Rio in?
The USDA's 2023 map puts Del Rio in zone 9a in ZIP code 78843, the nearest ZIP area. By the same method at Del Rio's NOAA station, the coldest night of a typical year reaches 24°F (30 years, 1991-2020): zone 9a.
How late can frost come in Del Rio?
In half of years the last 32°F night comes after February 16; in one year in ten it comes after March 10. Waiting until March 10 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Del Rio in OctoberThis month day by day, its records and recent years
- Texas climateThe statewide normals and every place in the state
- Amistad, TX8 miles from this station, 69.5°F a year
- Brackettville, TX31 miles from this station, 69.0°F a year
- Carta Valley, TX32 miles from this station, 67.1°F a year
- Hudspeth River Ranch, TX46 miles from this station, 67.9°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made