Harlingen Rio Grande, TX Climate: Temperature & Rain by Month
Pulled from NOAA NCEI 1991–2020 normals →: climate measurements used in PlainClimate's documented score
30-year climate normals (1991-2020) from Harlingen Rio Grande's primary NOAA station, HARLINGEN RIO GRANDE AP.
The climate verdict for Harlingen Rio Grande
Warm-season cooling demand defines Harlingen Rio Grande, Texas, running at more than twice its heating total. The NOAA normal records an annual average of 75°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.
- 75°F
- average temperature, NOAA 1991-2020 normal
- 100/100
- comfort score, above 99% of station-mapped location scores
- 24.0"
- precipitation, annual total
- 355 days
- frost-free growing season
Harlingen Rio Grande: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USW00012904 · Harlingen Rio Grande, TX 75°F mean · 24.0" precip
TEMP-HOT · RANK-WARM · PHOTO-FINISH · PRCP-DRY · SWING-NARROW · COMF-TOP · LOAD-COOL · STN-1 · BOOK-FULL
- TEMP-HOT 75°F
- RANK-WARM #6,792
- PHOTO-FINISH ≈ Weslaco
- PRCP-DRY 24.0"
- SWING-NARROW 25°F
- COMF-TOP 100/100
- LOAD-COOL 4,220 CDD
- STN-1 USW00012904
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Weslaco, TX (+ 0.1 °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.
- Harlingen Rio G… (this station) 75°F
- Hot Weslaco, TX 75°F
- Near Port Isabel Cam…, TX 75°F
- Near Santa Rosa, TX 75°F
- Cold Raymondville, TX 74°F
Harlingen Rio Grande 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 · Harlingen Rio Grande
Harlingen Rio Grande: 67/100 · grade C
Harlingen Rio Grande publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Harlingen Rio Grande, not an official NOAA rating. Rankings still use Comfort Score 100/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 355 days/year | 100/100 · A |
| Annual temperature balance | 74.9°F · 7.4° from 67.5°F | 77/100 · B |
| Precipitation balance | 24.0 in · 11.0 from 35 in | 61/100 · C |
| Normal heat + freeze calendar | 148 calendar days | 48/100 · D |
Harlingen Rio Grande · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Harlingen Rio Grande'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
- 86.2°F
- Coldest month
- 60.8°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 Harlingen Rio Grande sits across the climate record
Three NOAA fields for Harlingen Rio Grande's primary station, temperature, precipitation, and seasonal swing, are ranked against every station-mapped normal that carries the same field.
- Annual temperature
- Top 1% warmest
- Among 6,861 stations, Harlingen Rio Grande sits in the warmer third of annual means.
- Annual precipitation
- 33rd percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 94%
- Warmest-to-coldest month gap for Harlingen Rio Grande is compact versus 6,861 complete station-years.
How Harlingen Rio Grande compares across U.S. station-mapped locations
Harlingen Rio Grande'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
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 72°F (22°C) | 50°F (10°C) | 61°F (16°C) | 1.1" | 0.6 | 0.2 |
| February | 76°F (24°C) | 54°F (12°C) | 65°F (18°C) | 0.7" | 0.3 | 0.7 |
| March | 81°F (27°C) | 59°F (15°C) | 70°F (21°C) | 1.3" | 0.0 | 3.2 |
| April | 87°F (30°C) | 65°F (18°C) | 76°F (24°C) | 1.5" | 0.0 | 11.0 |
| May | 91°F (33°C) | 71°F (22°C) | 81°F (27°C) | 2.5" | 0.0 | 22.0 |
| June | 95°F (35°C) | 75°F (24°C) | 85°F (29°C) | 2.3" | 0.0 | 28.1 |
| July | 96°F (36°C) | 75°F (24°C) | 86°F (30°C) | 1.8" | 0.0 | 29.5 |
| August | 97°F (36°C) | 75°F (24°C) | 86°F (30°C) | 1.9" | 0.0 | 30.2 |
| September | 92°F (33°C) | 73°F (23°C) | 82°F (28°C) | 5.3" | 0.0 | 22.1 |
| October | 88°F (31°C) | 66°F (19°C) | 77°F (25°C) | 2.7" | 0.0 | 14.1 |
| November | 79°F (26°C) | 57°F (14°C) | 68°F (20°C) | 1.8" | 0.0 | 1.9 |
| December | 73°F (23°C) | 52°F (11°C) | 62°F (17°C) | 1.2" | 0.5 | 0.0 |
The year, day by day
The year in Harlingen Rio Grande runs from a mild 49°F around January 6 to 98°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 May 9 through October 3, covering 148 dates. The broader mild season, normal highs of 70°F or more, runs January 1 to December 31.
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 49°F around January 6.
Where the wet dates fall
The likeliest wet date is September 15, when 36% of years recorded at least a hundredth of an inch. The driest is August 1 at 15%. Summed across the calendar, that is about 84 wet dates a year.
The widest day
October 24 carries the biggest normal gap between afternoon and dawn, 23°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Harlingen Rio Grande.
Where Harlingen Rio Grande Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 148 days a year the normal daily high itself reaches 90°F — a count fewer than one station in ten exceeds.
Days and nights track unusually close together; the widest normal swing, about 23°F, is narrower than most stations record.
Harlingen Rio Grande earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
8.3 days with precipitation
5.8 days with precipitation
5.9 days with precipitation
4.7 days with precipitation
5.5 days with precipitation
6.2 days with precipitation
5.8 days with precipitation
5.4 days with precipitation
11.1 days with precipitation
8.9 days with precipitation
8.2 days with precipitation
7.7 days with precipitation
Harlingen Rio Grande spreads its precipitation across the year
Neither half of the year dominates here: June through August take 25% of the annual total and December through February 12%, with neither reaching the 35% that would mark a distinct wet season. Harlingen Rio Grande has no dry season to plan around, though it does carry an unusually narrow 25.4°F seasonal spread.
The gap between the wettest and driest month still matters: September averages 5.3" and February 0.7". The three wettest months together take 44% 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.
How Harlingen Rio Grande's precipitation splits across the calendar
About 84 days a year record measurable precipitation here, carrying 24.0" between them, or roughly 0.29 inches on a typical wet day. That sits in the middle band: neither the many-light-days pattern of the Pacific Northwest and the Great Lakes, nor the few-heavy-events pattern of the Gulf and the desert Southwest.
A wet day is one recording at least 0.01 inches. These are 1991-2020 normals: they describe an average year and say nothing about the heaviest single storm on record.
Frost Dates & Growing Season
First Fall Freeze
December 29
50% probability date
Last Spring Freeze
January 8
50% probability date
Growing Season
355 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
569
Higher = more heating needed
Cooling Degree Days
4,220
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside TX closest to Harlingen Rio Grande 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 (75°F here).
- Yuma Proving Ground, AZ 75°F · 0.1°F off
- Palm Springs, CA 75°F · 0.2°F off
- Gila Bend, AZ 75°F · 0.2°F off
- Immokalee, FL 75°F · 0.2°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (24.0" here), excluding temperature-peer places.
- Kamiah, ID 24.0" · 0.0" off
- Chamberlain, SD 24.1" · 0.0" off
- Alexandria, MN 24.1" · 0.1" off
- McLeod, ND 24.0" · 0.1" off
Data-derived climate profile
How Harlingen Rio Grande's climate pattern fits together
cooling led · moderate · low swing
Warm-season load persists through a relatively even calendar in Harlingen Rio Grande. Cooling totals 4,220 degree days, more than double the 569 heating measure, and the 25.4°F seasonal range is compact rather than sharply divided.
Harlingen Rio Grande's 24.0 inches of annual precipitation falls in PlainClimate's middle band, so “wet” or “dry” is not the leading description. Snowfall is not added to the interpretation because its annual value is missing. Temperature balance and the calendar distribution carry more information than the annual moisture label alone.
Temperature varies within a narrow 25.4°F band across the normal year. August and January mark the typical warm and cold ends of the calendar. The annual average is 75°F. Monthly rows still matter, but they refine a steady profile rather than reveal two climatic extremes.
With about 355 frost-free days, the calendar is constrained more by sustained heat than by freeze timing. This does not measure crop suitability or soil moisture; it only reports the NOAA-derived frost-free window for Harlingen Rio Grande.
These labels group NOAA 1991-2020 normals from Harlingen Rio Grande'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 Harlingen Rio Grande that means a descriptive range only — not an official NOAA classification and not a prediction for next summer.
Questions about Harlingen Rio Grande's climate
How much rain does Harlingen Rio Grande get? ▼
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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 Harlingen Rio Grande's primary station: HARLINGEN RIO GRANDE AP (USW00012904). For informational purposes only.
Place identity: U.S. Census Bureau 2024 Gazetteer places. The conservative exact name-and-state crosswalk finds no Census place match, so PlainClimate treats this as a station-mapped location and does not claim it is a municipality. No exact Gazetteer row for Harlingen Rio Grande; facility counts that depend on place identity are therefore an upper bound, not a municipal census.
On this page every temperature, precipitation, and derived score for Harlingen Rio Grande 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.