Rio Grande City, Texas climate: Normal weather by month, frost dates and records
Rio Grande City's normal year runs from 45°F January nights to 99°F August afternoons, with 22.5 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 23.6°C, January lows of 7°C, August highs of 37°C, 571 mm of precipitation a year.
- NOAA stationRio Grande City
- Station IDUSC00417622
- Location26.38°N 98.81°W
- Elevation172 ft (52 m)
- Population15,526
On October 23, the normal high in Rio Grande City is 87°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 Rio Grande City.
- Jan 71° 45°
- Feb 76° 50°
- Mar 82° 56°
- Apr 89° 63°
- May 94° 70°
- Jun 98° 74°
- Jul 99° 75°
- Aug 99° 75°
- Sep 94° 71°
- Oct 88° 63°
- Nov 79° 54°
- Dec 72° 47°
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 Rio Grande City each month?
August is the warmest month, with normal highs of 99°F; January the coldest, with normal lows of 45°F. The most precipitation falls in September (5.12 in), the least in January (0.78 in).
| Month | High | Low | Mean | Precip. | Wet days | 90°F days | Freezing nights | Daylight |
|---|---|---|---|---|---|---|---|---|
| January | 71°F | 45°F | 57.9°F | 0.78 | 6 | 1 | 2 | 10 h 40 min |
| February | 76°F | 50°F | 63.1°F | 0.95 | 5 | 4 | 1 | 11 h 20 min |
| March | 82°F | 56°F | 69.1°F | 1.25 | 5 | 7 | <1 | 12 h |
| April | 89°F | 63°F | 75.7°F | 1.02 | 4 | 16 | <1 | 12 h 50 min |
| May | 94°F | 70°F | 81.9°F | 2.85 | 5 | 25 | <1 | 13 h 30 min |
| June | 98°F | 74°F | 86.2°F | 2.76 | 4 | 29 | <1 | 13 h 50 min |
| July | 99°F | 75°F | 87.1°F | 2.04 | 4 | 30 | <1 | 13 h 40 min |
| August | 99°F | 75°F | 87.3°F | 1.34 | 4 | 30 | <1 | 13 h 10 min |
| September | 94°F | 71°F | 82.5°F | 5.12 | 8 | 25 | <1 | 12 h 20 min |
| October | 88°F | 63°F | 75.9°F | 2.46 | 5 | 17 | <1 | 11 h 30 min |
| November | 79°F | 54°F | 66.5°F | 1.10 | 5 | 4 | <1 | 10 h 50 min |
| December | 72°F | 47°F | 59.2°F | 0.80 | 6 | 1 | 2 | 10 h 30 min |
| Year (annual) | 87°F | 62°F | 74.4°F | 22.47 | 59 | 187 | 6 |
The same normals in °C and millimetres
| Month | High | Low | Mean | Precip. |
|---|---|---|---|---|
| January | 22°C | 7°C | 14.4°C | 20 mm |
| February | 25°C | 10°C | 17.3°C | 24 mm |
| March | 28°C | 13°C | 20.6°C | 32 mm |
| April | 31°C | 17°C | 24.3°C | 26 mm |
| May | 34°C | 21°C | 27.7°C | 72 mm |
| June | 37°C | 24°C | 30.1°C | 70 mm |
| July | 37°C | 24°C | 30.6°C | 52 mm |
| August | 37°C | 24°C | 30.7°C | 34 mm |
| September | 34°C | 22°C | 28.1°C | 130 mm |
| October | 31°C | 17°C | 24.4°C | 62 mm |
| November | 26°C | 12°C | 19.2°C | 28 mm |
| December | 22°C | 8°C | 15.1°C | 20 mm |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00417622; 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 Rio Grande City?
Normal highs sit between 65°F and 85°F in January, February, March, November and December. Of those, February 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 USC00417622.
When is the last frost in Rio Grande City?
In Rio Grande City, the last spring frost (32°F) comes after January 31 in half of years and after March 4 in one year in ten; the first autumn frost comes before December 17 in half of years and before November 22 in one year in ten. A night at 32°F or colder comes at all in 93% of years here (NOAA).
Frost-free in half of yearsFrost in 1 to 9 years out of 10Frost most years
- Last spring frost, half of years after
- January 311 year in 10 after March 4; 9 in 10 after December 29
- First autumn frost, half of years before
- December 171 year in 10 before November 22; 9 in 10 before January 20
NOAA puts the median frost-free season at 321 days, and the season without a hard freeze (28°F) at 357 days.
A hard freeze (28°F) comes after January 12 in half of springs and before December 29 in half of autumns.
The USDA's 2023 Plant Hardiness Zone Map puts Rio Grande City in zone 9b in ZIP code 78547, the nearest ZIP area. By the map's own method, the average of each year's coldest night over 1991-2020, Rio Grande City's NOAA station is in zone 9b: the coldest night of a typical year reaches 29°F (15 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 USC00417622; 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 Rio Grande City?
In a normal year in Rio Grande City, 187 days a year reach 90°F (63 of them 100°F or more), 6 nights fall to 32°F or colder and 59 days bring measurable precipitation.
- Days at 90°F or more
- 187a normal year
- Days at 100°F or more
- 63a normal year
- Nights at 32°F or colder
- 6a 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 this station's record (since 1897) is 116°F, on June 14, 1998; the lowest is 10°F, on January 12, 1962.
The wettest calendar year on that record is 1967, with 48.35 in; the snowiest season is 1905–06, with 3.0 inches.
Source: NOAA NCEI 1991-2020 annual normals, station USC00417622; records: ACIS (NOAA Regional Climate Centers), station USC00417622. Records use complete months only; a month missing more than three days is left out.
How sunny is Rio Grande City?
Over a year 81% of the sunlight that would reach the ground under clear skies gets through the clouds in the area around Rio Grande City, 5.1 kWh per square metre a day. August is the sunniest month (90%) and January the cloudiest (72%).
| Month | Share of clear-sky sunshine | Sunshine, kWh/m² a day |
|---|---|---|
| January | 72% | 3.2 |
| February | 73% | 4.0 |
| March | 74% | 4.8 |
| April | 78% | 5.6 |
| May | 82% | 6.1 |
| June | 88% | 6.9 |
| July | 88% | 6.8 |
| August | 90% | 6.6 |
| September | 83% | 5.4 |
| October | 84% | 4.7 |
| November | 79% | 3.7 |
| December | 72% | 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 Rio Grande City need?
A normal year in Rio Grande City brings 796 heating degree days, 85% fewer than the median U.S. place (5,373), and 4,232 cooling degree days, 4.7 times the median (908). No month reaches 300 heating degree days. For gardens and crops, NOAA counts 8,984 growing degree days a year above 50°F.
| Month | Heating | Cooling |
|---|---|---|
| January | 254 | 36 |
| February | 135 | 80 |
| March | 59 | 188 |
| April | 10 | 330 |
| May | 1 | 523 |
| June | 0 | 637 |
| July | 0 | 684 |
| August | 0 | 690 |
| September | 1 | 524 |
| October | 12 | 350 |
| November | 94 | 139 |
| December | 231 | 53 |
| Year (annual) | 796 | 4,232 |
Source: NOAA NCEI 1991-2020 monthly normals, station USC00417622. 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 Rio Grande City been warmer than normal lately?
2023 averaged 77.1°F, 2.7°F above the 1991-2020 normal of 74.4°F. 3 of the 3 complete years since 2021 ran warmer than the normal.
| Year | Mean | Against normal | Precip. |
|---|---|---|---|
| 2021 | 75.5°F | +1.1°F | – |
| 2022 | 74.7°F | +0.3°F | 19.21 |
| 2023 | 77.1°F | +2.7°F | 20.56 |
Over 51 complete years from 1928 to 2024, the station's annual mean temperature rose at a fitted 5.1°F per century (+0.28°C per decade). A fitted rate summarizes the whole record; single years swing well above and below it.
Source: observed years: ACIS, station USC00417622; trend: NOAA GHCN-Monthly v4. A year counts only with all twelve months complete.
How does Rio Grande City's climate compare?
Rio Grande City is warmer than 309 of the other 320 places with their own NOAA record in Texas, and wetter than 81. Across the 7,247 U.S. stations with normals, its annual mean of 74.4°F is warmer than 98%.
In the Köppen classification computed from these normals, Rio Grande 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 Rio Grande City share this climate record?
92 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.
- Roma, TX11,635 people · 12 mi W
- Escobares, TX2,589 people · 10 mi W
- Las Lomas, TX1,836 people · 2 mi E
- Mikes, TX1,676 people · 12 mi E
- La Grulla, TX1,237 people · 12 mi SE
- Mi Ranchito Estate, TX1,127 people · 4 mi W
- Alto Bonito Heights, TX971 people · 11 mi E
- Nina, TX884 people · 16 mi SE
- West Alto Bonito, TX745 people · 10 mi SE
- La Puerta, TX718 people · 4 mi SE
- El Refugio, TX686 people · 4 mi SE
- Garza-Salinas II, TX673 people · 4 mi SE
- Olivia Lopez de Gutierrez, TX618 people · 7 mi SE
- El Rancho Vela, TX587 people · 3 mi NE
- Valle Vista, TX434 people · 11 mi SE
- East Alto Bonito, TX425 people · 12 mi SE
- La Esperanza, TX401 people · 6 mi NW
- El Cenizo, TX380 people · 7 mi W
- Santa Rosa, TX363 people · 3 mi SE
- Narciso Pena, TX350 people · 12 mi SE
- J.F. Villareal, TX349 people · 11 mi W
- Santa Cruz, TX315 people · 3 mi SE
- Ranchitos del Norte, TX308 people · 4 mi NW
- El Castillo, TX307 people · 11 mi E
- Pablo Pena, TX279 people · 12 mi SE
- Camargito, TX276 people · 5 mi SE
- Hilltop, TX269 people · 7 mi W
- La Victoria, TX266 people · 11 mi E
- Garciasville, TX260 people · 8 mi SE
- La Rosita, TX251 people · 8 mi W
- Los Alvarez, TX232 people · 5 mi W
- Mesquite, TX219 people · 11 mi W
- Barrera, TX208 people · 5 mi W
- Manuel Garcia, TX207 people · 7 mi SE
- Campo Verde, TX204 people · 6 mi W
- Flor del Rio, TX204 people · 6 mi W
- Regino Ramirez, TX193 people · 11 mi NW
- B and E, TX187 people · 4 mi E
- Los Barreras, TX178 people · 7 mi W
- El Chaparral, TX177 people · 3 mi SE
- E. Lopez, TX171 people · 12 mi SE
- Villarreal, TX168 people · 11 mi SE
- Rancho Viejo, TX166 people · 7 mi W
- Sammy Martinez, TX161 people · 5 mi NE
- North Escobares, TX142 people · 11 mi W
- La Chuparosa, TX131 people · 7 mi W
- Chaparrito, TX128 people · 5 mi SE
- Loma Vista, TX123 people · 11 mi W
- La Escondida, TX121 people · 4 mi W
- Airport Heights, TX116 people · 3 mi NW
- Miguel Barrera, TX107 people · 7 mi W
- Zarate, TX104 people · 11 mi E
- El Brazil, TX100 people · 8 mi NE
- Benjamin Perez, TX95 people · 6 mi W
- Pena, TX91 people · 10 mi W
- San Juan, TX91 people · 9 mi W
- La Carla, TX89 people · 6 mi NE
- Eugenio Saenz, TX72 people · 11 mi E
- Quesada, TX61 people · 16 mi SE
- Los Ebanos, TX58 people · 7 mi W
- Palo Blanco, TX56 people · 6 mi W
- El Socio, TX53 people · 11 mi E
- El Quiote, TX51 people · 6 mi W
- San Fernando, TX46 people · 2 mi NW
- Garceno, TX41 people · 8 mi W
- Olmito and Olmito, TX39 people · 11 mi E
- Victoria Vera, TX27 people · 8 mi SE
- Rafael Pena, TX26 people · 12 mi SE
- La Casita, TX22 people · 6 mi SE
- La Paloma Ranchettes, TX20 people · 12 mi E
- Gutierrez, TX11 people · 11 mi E
- Martinez, TX8 people · 5 mi NE
- Amada Acres, TX0 people · 5 mi SE
- Anacua, TX0 people · 7 mi W
- Buena Vista, TX0 people · 14 mi SE
- Casa Blanca, TX0 people · 14 mi SE
- Casas, TX0 people · 10 mi NW
- El Mesquite, TX0 people · 3 mi E
- Elias-Fela Solis, TX0 people · 12 mi E
- Fernando Salinas, TX0 people · 2 mi NW
- Loma Linda East, TX0 people · 8 mi SE
- Loma Linda West, TX0 people · 8 mi W
- Longoria, TX0 people · 12 mi SE
- Manuel Garcia II, TX0 people · 9 mi SE
- Moraida, TX0 people · 11 mi W
- Netos, TX0 people · 4 mi NE
- Ramirez-Perez, TX0 people · 8 mi SE
- Rivereno, TX0 people · 12 mi SE
- Santa Anna, TX0 people · 26 mi NE
- Santel, TX0 people · 4 mi W
- Tierra Dorada, TX0 people · 7 mi W
- Valle Hermoso, TX0 people · 2 mi E
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 Rio Grande City's climate
What is the coldest month in Rio Grande City?
January, with a normal high of 71°F and a normal low of 45°F. The warmest is August (99°F by day, 75°F at night).
Does it snow in Rio Grande City?
Rarely: NOAA's normal is 0.1 inch a year.
What is the rainiest month in Rio Grande City?
September, with 5.12 in of precipitation in a normal year; the driest is January with 0.78 in.
What plant hardiness zone is Rio Grande City in?
The USDA's 2023 map puts Rio Grande City in zone 9b in ZIP code 78547, the nearest ZIP area. By the same method at Rio Grande City's NOAA station, the coldest night of a typical year reaches 29°F (15 years, 1991-2020): zone 9b.
How late can frost come in Rio Grande City?
In half of years the last 32°F night comes after January 31; in one year in ten it comes after March 4. Waiting until March 4 leaves about a one-in-ten chance of a later frost.
Nearby and next
- Texas climateThe statewide normals and every place in the state
- Falcon Dam, TX24 miles from this station, 76.6°F a year
- La Joya, TX30 miles from this station, 73.4°F a year
- McAllen, TX37 miles from this station, 77.4°F a year
- Edinburg, TX41 miles from this station, 75.0°F a year
- Compare two placesMonth by month, side by side
Download these normals (CSV) · JSON · How these figures are made