Weslaco, 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 Weslaco's primary NOAA station, WESLACO.
The climate verdict for Weslaco
Warm-season cooling demand defines Weslaco, 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
- yearly average temperature, NOAA normal
- 100/100
- comfort score, above 99% of station-mapped location scores
- 25.7"
- precipitation, annual total
- 357 days
- frost-free days per growing season
Weslaco: NOAA 1991-2020 normals describe a typical year, not a forecast. Method: /methodology.
Normals record plate
Sheet USC00419588 · Weslaco, TX 75°F mean · 25.7" precip
TEMP-HOT · RANK-WARM · PHOTO-FINISH · PRCP-MID · SWING-NARROW · COMF-TOP · LOAD-COOL · STN-1 · BOOK-FULL
- TEMP-HOT 75°F
- RANK-WARM #6,792
- PHOTO-FINISH ≈ Port Isabel Cam…
- PRCP-MID 25.7"
- SWING-NARROW 26°F
- COMF-TOP 100/100
- LOAD-COOL 4,251 CDD
- STN-1 USC00419588
- BOOK-FULL 6/6 fields
Nearest mean-temperature peer: Port Isabel Cameron, TX ( -0.2 °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 Mcallen, TX 76°F
- Weslaco (this station) 75°F
- Near Port Isabel Cam…, TX 75°F
- Near Santa Rosa, TX 75°F
- Cold Raymondville, TX 74°F
Weslaco 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 · Weslaco
Weslaco: 71/100 · grade B
Weslaco publishes 4 of 6 Living Index dimensions (NOAA annual/seasonal normals · NOAA daily multivariate normals); 2 missing weights rescale to 100.
PlainClimate-derived for Weslaco, not an official NOAA rating. Rankings still use Comfort Score 100/100 (separate formula). Breakpoints and limits.
| Dimension | Station value | Score |
|---|---|---|
| Frost-free season | 357 days/year | 100/100 · A |
| Annual temperature balance | 75.0°F · 7.5° from 67.5°F | 76/100 · B |
| Precipitation balance | 25.7 in · 9.3 from 35 in | 67/100 · C |
| Normal heat + freeze calendar | 135 calendar days | 56/100 · C |
Weslaco · 2026-08-04 · NOAA NCEI Climate Normals · method · Comfort Score method.
Weslaco is a temperate Köppen climate: Cfa
Coldest-month mean 60.7°F and warmest-month mean 86.9°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
- 86.9°F
- Coldest month
- 60.7°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 Weslaco sits across the climate record
Three NOAA fields for Weslaco'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, Weslaco sits in the warmer third of annual means.
- Annual precipitation
- 35th percentile wetness
- Neither arid nor torrential versus 6,352 station totals.
- Seasonal temperature swing
- Narrower than 94%
- Warmest-to-coldest month gap for Weslaco is compact versus 6,861 complete station-years.
How Weslaco compares across U.S. station-mapped locations
Weslaco'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
Weslaco's measured station temperature trend
MethodologyAcross 48 complete annual observations from 1924 to 2025, WESLACO warmed at a fitted rate of 0.26°C per decade. The line shows the fitted change relative to its first year, not raw year-to-year temperatures or a forecast.
- Weslaco primary station fitted change +0.26 °C/decade
Monthly Temperatures
Average daily high and low temperatures by month
| Month | Avg High | Avg Low | Mean | Precip | Freeze Days | 90°F+ Days |
|---|---|---|---|---|---|---|
| January | 71°F (22°C) | 50°F (10°C) | 61°F (16°C) | 1.0" | 0.3 | 0.2 |
| February | 75°F (24°C) | 54°F (12°C) | 64°F (18°C) | 0.9" | 0.5 | 1.0 |
| March | 81°F (27°C) | 60°F (16°C) | 70°F (21°C) | 1.4" | 0.0 | 3.1 |
| April | 86°F (30°C) | 65°F (18°C) | 76°F (24°C) | 1.5" | 0.0 | 8.9 |
| May | 90°F (32°C) | 72°F (22°C) | 81°F (27°C) | 2.6" | 0.0 | 20.8 |
| June | 95°F (35°C) | 76°F (24°C) | 85°F (30°C) | 2.8" | 0.0 | 27.4 |
| July | 96°F (35°C) | 77°F (25°C) | 86°F (30°C) | 2.2" | 0.0 | 29.3 |
| August | 97°F (36°C) | 76°F (25°C) | 87°F (31°C) | 1.9" | 0.0 | 29.7 |
| September | 92°F (33°C) | 73°F (23°C) | 82°F (28°C) | 5.6" | 0.0 | 22.1 |
| October | 87°F (31°C) | 66°F (19°C) | 77°F (25°C) | 2.8" | 0.0 | 15.3 |
| November | 80°F (27°C) | 58°F (15°C) | 69°F (21°C) | 1.6" | 0.0 | 2.1 |
| December | 72°F (22°C) | 52°F (11°C) | 62°F (17°C) | 1.3" | 0.2 | 0.2 |
The year, day by day
The year in Weslaco runs from a mild 50°F around January 6 to 98°F at the peak near August 8, and the normal low never reaches freezing on any date in the record.
When the heat sits
Normal highs reach 90°F from May 15 through September 26, covering 135 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 50°F around January 6.
The widest day
February 3 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 Weslaco.
Where Weslaco Stands Nationally
Summers here run among the most heat-heavy normals calendars in the country: on about 135 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.
Weslaco earns 2 nationally notable standings (outer quintiles) against 6,860 NOAA 1991–2020 normals stations; only those extremes render.
Monthly Precipitation
Average monthly rainfall
Weslaco 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 13%, with neither reaching the 35% that would mark a distinct wet season. Weslaco has no dry season to plan around, though it does carry an unusually narrow 26.2°F seasonal spread.
The gap between the wettest and driest month still matters: September averages 5.6" and February 0.9". 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.
Frost Dates & Growing Season
First Fall Freeze
December 31
50% probability date
Last Spring Freeze
January 8
50% probability date
Growing Season
357 days
Heating & Cooling Degree Days
Annual totals indicate energy demand for heating and cooling
Heating Degree Days
580
Higher = more heating needed
Cooling Degree Days
4,251
Higher = more cooling needed
Warmest Month
August
Coldest Month
January
Nationwide similar cities
Other rankable U.S. places outside TX closest to Weslaco 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).
- Palm Springs, CA 75°F · 0.1°F off
- Yuma Proving Ground, AZ 75°F · 0.2°F off
- Gila Bend, AZ 75°F · 0.3°F off
- Immokalee, FL 75°F · 0.3°F off
Closest by annual precipitation
Nearest out-of-state peers by annual precipitation (25.7" here), excluding temperature-peer places.
- Verdi, CA 25.7" · 0.0" off
- Summit, SD 25.7" · 0.0" off
- Leavenworth, WA 25.7" · 0.0" off
- Mitchell, SD 25.8" · 0.1" off
Data-derived climate profile
How Weslaco's climate pattern fits together
cooling led · moderate · low swing
Warm-season load persists through a relatively even calendar in Weslaco. Cooling totals 4,251 degree days, more than double the 580 heating measure, and the 26.2°F seasonal range is compact rather than sharply divided.
Weslaco's 25.7 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 26.2°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 357 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 Weslaco.
These labels group NOAA 1991-2020 normals from Weslaco'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 Weslaco that means a descriptive range only — not an official NOAA classification and not a prediction for next summer.
Questions about Weslaco's climate
How much rain does Weslaco get? ▼
How many days above 90°F does Weslaco get? ▼
How much energy does heating and cooling require in Weslaco? ▼
Data Sources
Data source: NOAA U.S. Climate Normals v1.0.1 (1991-2020). All figures on this page are from Weslaco's primary station: WESLACO (USC00419588). 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 4877272). Match rule for Weslaco: 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 Weslaco 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.