Rio Grande City, TX Climate: Temperature & Rain by Month
Explore NOAA NCEI's 1991–2020 climate normals → and a clearly labeled PlainClimate comfort calculation
30-year climate normals (1991-2020) from Rio Grande City's primary NOAA station, RIO GRANDE CITY.
The climate verdict for Rio Grande City
Warm-season cooling demand defines Rio Grande City, Texas, running at more than twice its heating total. The NOAA normal records an annual average of 74°F. It scores 100/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 99% of them.
- 74°F
- yearly average temperature, NOAA normal
- 100/100
- comfort score, above 99% of station-mapped location scores
- 22.5"
- yearly precipitation total
- 320 days
- frost-free days per growing season
Rio Grande City: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00417622 · Rio Grande City, TX 74°F mean · 22.5" precip
TEMP-HOT · RANK-WARM · PHOTO-FINISH · PRCP-DRY · SWING-NARROW · COMF-TOP · LOAD-COOL · STN-1 · BOOK-FULL
- TEMP-HOT 74°F
- RANK-WARM #6,724
- PHOTO-FINISH ≈ Zapata
- PRCP-DRY 22.5"
- SWING-NARROW 29°F
- COMF-TOP 100/100
- LOAD-COOL 4,232 CDD
- STN-1 USC00417622
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Zapata, TX (+ 0 °F mean)
Instrument codes from this station's NOAA 1991–2020 normals, mean temperature, corpus warmth rank, photo-finish peer station, precipitation band, seasonal swing, comfort composite, degree-day load, and field book, not a livability rating.
Mean-temperature neighbourhood
Nationwide NOAA normal poles and nearest peers, not a reprint of every TX station list.
- Hot Laredo, TX 75°F
- Near Yuma Quartermas…, AZ 75°F
- Rio Grande City (this station) 74°F
- Cold El Centro, CA 74°F
- Near Zapata, TX 74°F
Rio Grande City sits in Texas, the #4 hottest U.S. state at 66.2°F statewide annual average - see all 50 hottest states ranked by NOAA normals
Climate Living Index · Rio Grande City
Rio Grande City: 64/100 · grade C
Rio Grande City publishes 5 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 1 missing weight rescale to 100.
PlainClimate-derived for Rio Grande City, not an official NOAA rating. Rankings still use Comfort Score 100/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 320 days/year | 100/100 · A |
| Snowfall burden | 0.1 inches/year | 89/100 · A |
| Annual temperature balance | 74.4°F · 6.9° from 67.5°F | 78/100 · B |
| Precipitation balance | 22.5 in · 12.5 from 35 in | 56/100 · C |
| Normal heat + freeze calendar | 171 calendar days | 31/100 · F |
Rio Grande City · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Rio Grande City's normals sit in a dry climate class: BSh
Precipitation is low relative to temperature but above true desert thresholds: hot semi-arid steppe (BSh). Class BSh is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: dry (arid or semi-arid), specifically hot semi-arid steppe.
- Köppen code
- BSh
- Group
- Dry (arid or semi-arid)
- Warmest month
- 87.3°F
- Coldest month
- 57.9°F
Source: official public datasets monthly normals (1991–2020) at the city’s primary station. This is a station classification, not a mapped regional consensus.
National standing · cooling-led station
Where Rio Grande City sits across the climate record
Three NOAA fields for Rio Grande City's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 2% warmest
- Among 6,861 stations, Rio Grande City sits in the warmer third of annual means.
- Annual precipitation
- 31st percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 91%
- Warmest-to-coldest month gap for Rio Grande City is compact versus 6,861 complete station-years.
How Rio Grande City compares across U.S. station-mapped locations
Rio Grande City's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
100 Top 1% score exceeds 99% of 6,189 station-mapped location scores
- 0–10: 0 station-mapped locations (0%). Below this entry.
- 10–20: 0 station-mapped locations (0%). Below this entry.
- 20–30: 96 station-mapped locations (2%). Below this entry.
- 30–40: 280 station-mapped locations (5%). Below this entry.
- 40–50: 1,113 station-mapped locations (18%). Below this entry.
- 50–60: 1,329 station-mapped locations (21%). Below this entry.
- 60–70: 1,236 station-mapped locations (20%). Below this entry.
- 70–80: 650 station-mapped locations (11%). Below this entry.
- 80–90: 921 station-mapped locations (15%). Below this entry.
- 90–100: 564 station-mapped locations (9%). This entry sits in this band.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Rio Grande City's measured station temperature trend
MethodologyAcross 51 complete annual observations from 1928 to 2024, RIO GRANDE CITY warmed at a fitted rate of 0.28°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Rio Grande City primary station fitted change +0.28 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Snow | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|---|
| January | 71°F (22°C) | 45°F (7°C) | 58°F (14°C) | 0.8" | 0.0" | 2.0 | 0.6 |
| February | 76°F (25°C) | 50°F (10°C) | 63°F (17°C) | 0.9" | 0.0" | 0.9 | 3.5 |
| March | 82°F (28°C) | 56°F (13°C) | 69°F (21°C) | 1.3" | 0.0" | 0.1 | 7.3 |
| April | 89°F (31°C) | 63°F (17°C) | 76°F (24°C) | 1.0" | 0.0" | 0.0 | 15.7 |
| May | 94°F (34°C) | 70°F (21°C) | 82°F (28°C) | 2.9" | 0.0" | 0.0 | 24.5 |
| June | 98°F (37°C) | 74°F (24°C) | 86°F (30°C) | 2.8" | 0.0" | 0.0 | 28.9 |
| July | 99°F (37°C) | 75°F (24°C) | 87°F (31°C) | 2.0" | 0.0" | 0.0 | 29.5 |
| August | 99°F (37°C) | 75°F (24°C) | 87°F (31°C) | 1.3" | 0.0" | 0.0 | 30.0 |
| September | 94°F (34°C) | 71°F (22°C) | 83°F (28°C) | 5.1" | 0.0" | 0.0 | 25.3 |
| October | 88°F (31°C) | 63°F (17°C) | 76°F (24°C) | 2.5" | 0.0" | 0.0 | 17.1 |
| November | 79°F (26°C) | 54°F (12°C) | 67°F (19°C) | 1.1" | 0.0" | 0.3 | 3.9 |
| December | 72°F (22°C) | 47°F (8°C) | 59°F (15°C) | 0.8" | 0.1" | 2.2 | 0.7 |
The year, day by day
The year in Rio Grande City runs from a mild 45°F around January 2 to 100°F at the peak near August 6, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from April 23 through October 10, covering 171 dates. The broader mild season, normal highs of 70°F or more, runs January 14 to December 30.
This counts calendar dates whose 1991–2020 normal high reaches 90°F. It is a smaller number than the 90°F+ day counts in the monthly table above, which measure how often the threshold was actually crossed in a typical year. A date can average 88°F and still exceed 90°F in half of all years.
No freezing date
Not one calendar date in the 1991–2020 record carries a normal low at or below 32°F. The coldest normal low of the year is 45°F around January 2.
Where the wet dates fall
The likeliest wet date is September 8, when 24% of years recorded at least a hundredth of an inch. The driest is July 31 at 10%. Summed across the calendar, that is about 59 wet dates a year.
The widest day
February 11 carries the biggest normal gap between afternoon and dawn, 27°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Rio Grande City.
Where Rio Grande City Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 171 days a year the normal daily high itself reaches 90°F — a count fewer than one station in ten exceeds.
Rio Grande City earns one nationally notable standing (outer quintile) against 6,860 NOAA 1991–2020 normals stations, middle-of-the-pack metrics stay silent here.
Monthly Precipitation
Average monthly rainfall and snowfall
5.8 days with precipitation
4.5 days with precipitation
4.7 days with precipitation
4.1 days with precipitation
4.5 days with precipitation
4.0 days with precipitation
3.8 days with precipitation
3.9 days with precipitation
7.6 days with precipitation
4.8 days with precipitation
4.9 days with precipitation
Snow: 0.1"
6.0 days with precipitation
Rio Grande City spreads its precipitation across the year
Neither half of the year dominates here: June through August take 27% of the annual total and December through February 11%, with neither reaching the 35% that would mark a distinct wet season. Rio Grande City has no dry season to plan around, though it does carry an unusually narrow 29.4°F seasonal spread.
The gap between the wettest and driest month still matters: September averages 5.1" and January 0.8". The three wettest months together take 48% of the year, against the 25% a perfectly flat distribution would give them.
Shares are computed from this station's own 1991-2020 monthly precipitation normals. "Spread across the year" means neither the June-August nor the December-February share reaches 35%; it describes an average year, not the variability of any single one.
When it rains in Rio Grande City, it arrives in quantity
22.5" of precipitation falls across only about 59 wet days here, averaging 0.38 inches each. Fewer days carry more water: the year's total is delivered in comparatively heavy events rather than persistent damp.
- Days with measurable precipitation
- about 59 a year, 16% of all days
- Average depth per wet day
- 0.38 inches
- Most wet days
- September, about 8
- Fewest wet days
- July, about 4
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year, and a per-day average is not a forecast of any individual storm.
Snow reaches Rio Grande City, but rarely amounts to much
The normals record 0.1 inches of snow a year here, most likely in December. That is a real but marginal amount: enough that snow is part of the local record, not enough to define the winter.
A figure in this range usually reflects a handful of events that melt quickly rather than a season of accumulation.
NOAA 1991-2020 normals. An average across thirty years can smooth away a single heavy winter, so a small annual figure does not mean a significant snowfall is impossible.
Frost Dates & Growing Season
First Fall Freeze
December 17
50% probability date
Last Spring Freeze
January 31
50% probability date
Growing Season
320 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
796
Higher = more heating needed
Cooling Degree Days
4,232
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside TX closest to Rio Grande City on two NOAA annual-normal axes (mean temperature and annual precipitation). Chip rows use distinct link sets.
Closest by average temperature
Nearest out-of-state peers by annual mean temperature (74°F here).
- Blythe, CA 74°F · 0.0°F off
- Palm Beach Gardens, FL 74°F · 0.0°F off
- Tampa, FL 75°F · 0.1°F off
- Belle Glade, FL 74°F · 0.1°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (22.5" here), excluding temperature-peer places.
- Columbia, SD 22.5" · 0.0" off
- Flagstaff, AZ 22.5" · 0.0" off
- Vail, CO 22.4" · 0.0" off
- Culbertson, NE 22.5" · 0.1" off
Data-derived climate profile
How Rio Grande City's climate pattern fits together
cooling led · moderate · low swing
Warm-season load persists through a relatively even calendar in Rio Grande City. Cooling totals 4,232 degree days, more than double the 796 heating measure, and the 29.4°F seasonal range is compact rather than sharply divided.
Rio Grande City's 22.5 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Recorded annual snowfall is negligible. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
Temperature varies within a narrow 29.4°F band across the normal year. August and January mark the typical warm and cold ends of the calendar. The annual average is 74°F. Monthly rows still matter, but they refine a steady profile rather than reveal two climatic extremes.
The frost-free window extends for about 320 days. That is a long calendar measure, but it is not a forecast and does not combine heat, rainfall, soil, or local elevation into a planting recommendation.
These labels group NOAA 1991-2020 normals from Rio Grande City's primary station, so the summer figures are a thirty-year average rather than a ceiling: individual years have run hotter and will again. For Rio Grande City that means a descriptive range only — not an official NOAA classification and not a prediction for next summer.
Questions about Rio Grande City's climate
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Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Rio Grande City's primary station: RIO GRANDE CITY (USC00417622). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The 2024 Census Gazetteer identifies the exact name-and-state match as an incorporated place (GEOID 4862168). Match rule for Rio Grande City: exact normalized name + state only, no fuzzy expansion, so nearby differently spelled facilities stay unmatched.
On this page every temperature, precipitation, and derived score for Rio Grande City comes from its primary NOAA station record. No figure on this page is typed in by an editor - each value is rendered from NOAA 1991-2020 U.S. Climate Normals. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 1991–2020 normals.