Grandfalls, Texas climate: Normal weather by month, frost dates and records
Grandfalls's normal year runs from 27°F January nights to 98°F July afternoons, with 13.7 inches of precipitation and 1 inch of snow a year. (NOAA 1991-2020 normals)
In metric: a yearly mean of 18.3°C, January lows of −3°C, July highs of 37°C, 347 mm of precipitation a year.
- NOAA stationGrandfalls (3 mi SSE)
- Station IDUSC00413680
- Location31.30°N 102.82°W
- Elevation2,425 ft (739 m)
- From the center3 miles
- Population328
On October 23, the normal high in Grandfalls is 81°F and the normal low 45°F, and the chance of measurable rain or snow is 11%.
Normals describe a typical year at the station, not a forecast. The National Weather Service forecast for Grandfalls.
- Jan 61° 27°
- Feb 65° 32°
- Mar 75° 39°
- Apr 84° 47°
- May 92° 58°
- Jun 98° 67°
- Jul 98° 69°
- Aug 98° 68°
- Sep 91° 62°
- Oct 83° 49°
- Nov 70° 36°
- Dec 62° 28°
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 Grandfalls each month?
July is the warmest month, with normal highs of 98°F; January the coldest, with normal lows of 27°F. The most precipitation falls in September (2.21 in), the least in November (0.42 in).
| Month | High | Low | Mean | Precip. | Snow | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|---|
| January | 61°F | 27°F | 44.2°F | 0.59 | 0.9 | 3 | <1 | 23 | 10 h 20 min |
| February | 65°F | 32°F | 48.7°F | 0.53 | 0.1 | 3 | 1 | 13 | 11 h |
| March | 75°F | 39°F | 57.3°F | 0.54 | 0.0 | 2 | 3 | 6 | 12 h |
| April | 84°F | 47°F | 65.5°F | 0.75 | 0.0 | 2 | 11 | 1 | 12 h 50 min |
| May | 92°F | 58°F | 75.1°F | 1.49 | 0.0 | 4 | 19 | <1 | 13 h 40 min |
| June | 98°F | 67°F | 82.9°F | 1.89 | 0.0 | 4 | 28 | <1 | 14 h 10 min |
| July | 98°F | 69°F | 83.5°F | 1.53 | 0.0 | 4 | 28 | <1 | 14 h |
| August | 98°F | 68°F | 82.8°F | 1.80 | 0.0 | 4 | 29 | <1 | 13 h 20 min |
| September | 91°F | 62°F | 76.5°F | 2.21 | 0.0 | 5 | 19 | <1 | 12 h 20 min |
| October | 83°F | 49°F | 65.7°F | 1.20 | 0.0 | 3 | 9 | 2 | 11 h 30 min |
| November | 70°F | 36°F | 53.0°F | 0.42 | 0.0 | 2 | 1 | 10 | 10 h 40 min |
| December | 62°F | 28°F | 45.1°F | 0.72 | 0.4 | 3 | <1 | 22 | 10 h 10 min |
| Year (annual) | 82°F | 49°F | 65.0°F | 13.67 | 1.4 | 39 | 145 | 76 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. | Snow |
|---|---|---|---|---|---|
| January | 16°C | −3°C | 6.8°C | 15 mm | 2 cm |
| February | 19°C | 0°C | 9.3°C | 13 mm | 0 cm |
| March | 24°C | 4°C | 14.1°C | 14 mm | 0 cm |
| April | 29°C | 8°C | 18.6°C | 19 mm | 0 cm |
| May | 33°C | 15°C | 23.9°C | 38 mm | 0 cm |
| June | 37°C | 20°C | 28.3°C | 48 mm | 0 cm |
| July | 37°C | 21°C | 28.6°C | 39 mm | 0 cm |
| August | 37°C | 20°C | 28.2°C | 46 mm | 0 cm |
| September | 33°C | 17°C | 24.7°C | 56 mm | 0 cm |
| October | 28°C | 9°C | 18.7°C | 30 mm | 0 cm |
| November | 21°C | 2°C | 11.7°C | 11 mm | 0 cm |
| December | 17°C | −2°C | 7.3°C | 18 mm | 1 cm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00413680; 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 Grandfalls?
Normal highs sit between 65°F and 85°F in February, March, April, 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 USC00413680.
When is the last frost in Grandfalls?
In Grandfalls, the last spring frost (32°F) comes after April 2 in half of years and after April 19 in one year in ten; the first autumn frost comes before November 3 in half of years and before October 22 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
- April 21 year in 10 after April 19; 9 in 10 after March 11
- First autumn frost, half of years before
- November 31 year in 10 before October 22; 9 in 10 before November 17
NOAA puts the median frost-free season at 214 days, and the season without a hard freeze (28°F) at 236 days.
A hard freeze (28°F) comes after March 18 in half of springs and before November 12 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Grandfalls in zone 8a in ZIP code 79742, 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 USC00413680; 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 Grandfalls?
In a normal year in Grandfalls, 145 days a year reach 90°F (51 of them 100°F or more), 76 nights fall to 32°F or colder and 39 days bring measurable precipitation.
- Days at 90°F or more
- 145a normal year
- Days at 100°F or more
- 51a normal year
- Nights at 32°F or colder
- 76a normal year
- Days that stay below freezing
- 1high of 32°F or less
- Days with 0.01 inch of precipitation
- 39a normal year
- Days with 1 inch of snow or more
- 1a normal year
Source: NOAA NCEI 1991-2020 annual normals, station USC00413680.
How sunny is Grandfalls?
Over a year 88% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Grandfalls, 5.6 kWh per square metre a day. June is the sunniest month (92%) and February the cloudiest (83%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 84% | 3.5 |
| February | 83% | 4.4 |
| March | 85% | 5.6 |
| April | 88% | 6.9 |
| May | 88% | 7.3 |
| June | 92% | 7.7 |
| July | 90% | 7.3 |
| August | 90% | 6.8 |
| September | 87% | 5.7 |
| October | 88% | 4.8 |
| November | 86% | 3.8 |
| December | 83% | 3.2 |
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 Grandfalls need?
A normal year in Grandfalls brings 2,550 heating degree days, 53% fewer than the median U.S. place (5,373), and 2,590 cooling degree days, 2.9 times 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 6,153 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 645 | 0 |
| February | 458 | 1 |
| March | 265 | 26 |
| April | 92 | 105 |
| May | 12 | 327 |
| June | 0 | 537 |
| July | 0 | 572 |
| August | 0 | 552 |
| September | 7 | 351 |
| October | 87 | 110 |
| November | 368 | 9 |
| December | 617 | 0 |
| Year (annual) | 2,550 | 2,590 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00413680. 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 Grandfalls's climate compare?
Grandfalls is warmer than 129 of the other 320 places with their own NOAA record in Texas, and wetter than 16. Across the 7,247 U.S. stations with normals, its annual mean of 65.0°F is warmer than 88%.
In the Köppen classification computed from these normals, Grandfalls 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 Grandfalls share this climate record?
2 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.
- Imperial, TX276 people · 8 mi E
- Coyanosa, TX106 people · 15 mi W
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 Grandfalls's climate
What is the coldest month in Grandfalls?
January, with a normal high of 61°F and a normal low of 27°F. The warmest is July (98°F by day, 69°F at night).
Does it snow in Grandfalls?
Yes: 1 inch in a normal year, falling on 1 days with 0.1 inch or more, the most in January (0.9 inches).
What is the rainiest month in Grandfalls?
September, with 2.21 in of precipitation in a normal year; the driest is November with 0.42 in.
What plant hardiness zone is Grandfalls in?
The USDA's 2023 map puts Grandfalls in zone 8a in ZIP code 79742, the nearest ZIP area.
How late can frost come in Grandfalls?
In half of years the last 32°F night comes after April 2; in one year in ten it comes after April 19. Waiting until April 19 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Monahans, TX22 miles from this station, 65.8°F a year
- Fort Stockton, TX27 miles from this station, 66.6°F a year
- Crane, TX29 miles from this station, 66.3°F a year
- Penwell, TX33 miles from this station, 66.3°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made