Harlingen, 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 Harlingen's primary NOAA station, HARLINGEN.
The climate verdict for Harlingen
Warm-season cooling demand defines Harlingen, Texas, running at more than twice its heating total. The NOAA normal records an annual average of 76°F. It scores 88/100 for climate comfort (excellent), putting it in the top third of station-mapped location scores and exceeding 89% of them.
- 76°F
- annual average temperature (NOAA normal)
- 88/100
- comfort score, above 89% of station-mapped location scores
- 28.2"
- precipitation, annual total
Harlingen: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00413943 · Harlingen, TX 76°F mean · 28.2" precip
TEMP-HOT · RANK-WARM · PHOTO-FINISH · PRCP-MID · SWING-NARROW · COMF-TOP · LOAD-COOL · STN-1 · BOOK-FULL
- TEMP-HOT 76°F
- RANK-WARM #6,792
- PHOTO-FINISH ≈ Palm Springs
- PRCP-MID 28.2"
- SWING-NARROW 26°F
- COMF-TOP 88/100
- LOAD-COOL 4,438 CDD
- STN-1 USC00413943
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Palm Springs, CA ( -0.5 °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 (this station) 76°F
- Hot Brownsville, TX 76°F
- Cold Harlingen Rio G…, TX 75°F
- Near Palm Springs, CA 75°F
- Near Weslaco, TX 75°F
Harlingen 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
Harlingen: 67/100 · grade C
Harlingen 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, not an official NOAA rating. Rankings still use Comfort Score 88/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Snowfall burden | 0.1 inches/year | 89/100 · A |
| Precipitation balance | 28.2 in · 6.8 from 35 in | 76/100 · B |
| Annual temperature balance | 75.6°F · 8.1° from 67.5°F | 74/100 · B |
| Normal heat + freeze calendar | 150 calendar days | 46/100 · D |
Harlingen · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Harlingen is a temperate Köppen climate: Cfa
Coldest-month mean 61.4°F and warmest-month mean 87.3°F place this station in temperate, no dry season, hot summer climates (Cfa). Class Cfa is the Peel et al. (2007) label for this station's monthly mean temperature and precipitation normals: temperate, specifically temperate, no dry season, hot summer.
- Köppen code
- Cfa
- Group
- Temperate
- Warmest month
- 87.3°F
- Coldest month
- 61.4°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 sits across the climate record
Three NOAA fields for Harlingen'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 sits in the warmer third of annual means.
- Annual precipitation
- 38th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 94%
- Warmest-to-coldest month gap for Harlingen is compact versus 6,861 complete station-years.
How Harlingen compares across U.S. station-mapped locations
Harlingen's comfort score vs. all station-mapped locations
PlainClimate composite comfort index (1–100), NOAA 1991–2020 normals
88 Top 11% score exceeds 89% 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%). This entry sits in this band.
- 90–100: 564 station-mapped locations (9%). Above this entry.
Source NOAA U.S. Climate Normals, PlainClimate comfort index · 1991–2020
Harlingen's measured station temperature trend
MethodologyAcross 63 complete annual observations from 1914 to 2025, HARLINGEN warmed at a fitted rate of 0.18°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Harlingen primary station fitted change +0.18 °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 | 72°F (22°C) | 51°F (11°C) | 61°F (16°C) | 1.2" | 0.0" | 0.5 | 0.1 |
| February | 76°F (24°C) | 55°F (13°C) | 65°F (19°C) | 1.2" | 0.0" | 0.4 | 0.6 |
| March | 81°F (27°C) | 60°F (16°C) | 71°F (21°C) | 1.5" | 0.0" | 0.0 | 1.9 |
| April | 86°F (30°C) | 66°F (19°C) | 76°F (24°C) | 2.3" | 0.0" | 0.0 | 8.2 |
| May | 91°F (33°C) | 72°F (22°C) | 82°F (28°C) | 2.7" | 0.0" | 0.0 | 18.3 |
| June | 95°F (35°C) | 76°F (24°C) | 86°F (30°C) | 2.4" | 0.0" | 0.0 | 27.3 |
| July | 97°F (36°C) | 77°F (25°C) | 87°F (30°C) | 2.4" | 0.0" | 0.0 | 29.2 |
| August | 98°F (37°C) | 77°F (25°C) | 87°F (31°C) | 2.1" | 0.0" | 0.0 | 29.5 |
| September | 93°F (34°C) | 74°F (23°C) | 83°F (29°C) | 5.8" | 0.0" | 0.0 | 22.6 |
| October | 88°F (31°C) | 67°F (19°C) | 77°F (25°C) | 3.1" | 0.0" | 0.0 | 12.2 |
| November | 80°F (27°C) | 59°F (15°C) | 69°F (21°C) | 2.0" | 0.0" | 0.0 | 1.0 |
| December | 73°F (23°C) | 53°F (11°C) | 63°F (17°C) | 1.6" | 0.1" | 0.3 | 0.1 |
The year, day by day
The year in Harlingen runs from a mild 51°F around January 4 to 99°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 11 through October 7, covering 150 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 51°F around January 4.
Where the wet dates fall
The likeliest wet date is September 12, when 33% of years recorded at least a hundredth of an inch. The driest is April 16 at 15%. Summed across the calendar, that is about 78 wet dates a year.
The widest day
October 21 carries the biggest normal gap between afternoon and dawn, 22°F between the normal high and the normal low.
Look up any date
Any date's 1991–2020 normal for Harlingen.
Where Harlingen Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 150 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 22°F, is narrower than most stations record.
Harlingen earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall and snowfall
7.5 days with precipitation
5.8 days with precipitation
5.8 days with precipitation
4.8 days with precipitation
4.9 days with precipitation
6.5 days with precipitation
5.1 days with precipitation
5.9 days with precipitation
10.5 days with precipitation
6.3 days with precipitation
6.3 days with precipitation
Snow: 0.1"
7.5 days with precipitation
Harlingen spreads its precipitation across the year
Neither half of the year dominates here: June through August take 24% of the annual total and December through February 14%, with neither reaching the 35% that would mark a distinct wet season. Harlingen has no dry season to plan around, though it does carry an unusually narrow 25.9°F seasonal spread.
The gap between the wettest and driest month still matters: September averages 5.8" and February 1.2". The three wettest months together take 41% 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 Harlingen, it arrives in quantity
28.2" of precipitation falls across only about 77 wet days here, averaging 0.37 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 77 a year, 21% of all days
- Average depth per wet day
- 0.37 inches
- Most wet days
- September, about 11
- Fewest wet days
- April, about 5
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 Harlingen, 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
January 3
50% probability date
Last Spring Freeze
January 9
50% probability date
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
543
Higher = more heating needed
Cooling Degree Days
4,438
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside TX closest to Harlingen 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 (76°F here).
- Phoenix, AZ 76°F · 0.0°F off
- Punta Gorda, FL 76°F · 0.2°F off
- West Palm Beach, FL 76°F · 0.2°F off
- Marco Island, FL 75°F · 0.3°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (28.2" here), excluding temperature-peer places.
- Madison, NE 28.2" · 0.0" off
- Geneva, NE 28.2" · 0.0" off
- Tower, MN 28.2" · 0.0" off
- Waynoka, OK 28.2" · 0.0" off
Data-derived climate profile
How Harlingen's climate pattern fits together
cooling led · moderate · low swing
Warm-season load persists through a relatively even calendar in Harlingen. Cooling totals 4,438 degree days, more than double the 543 heating measure, and the 25.9°F seasonal range is compact rather than sharply divided.
Harlingen's 28.2 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 25.9°F band across the normal year. August and January mark the typical warm and cold ends of the calendar. The annual average is 76°F. Monthly rows still matter, but they refine a steady profile rather than reveal two climatic extremes.
A frost-free growing-season length is not available for Harlingen. That missing field is kept separate from the observed temperature and precipitation record rather than filled from a regional estimate.
These labels group NOAA 1991-2020 normals from Harlingen'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 that means a descriptive range only — not an official NOAA classification and not a prediction for next summer.
Questions about Harlingen's climate
How much rain does Harlingen get? ▼
How many days above 90°F does Harlingen 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's primary station: HARLINGEN (USC00413943). 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 4832372). Match rule for Harlingen: 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 Harlingen 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.