McAllen climate — normals and trends
McAllen (United States) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 23.7 °C and it receives 525 mm of precipitation per year.
These figures are normals computed over 86 complete calendar years, from 1940 to 2025, using ERA5 reanalysis data from the Copernicus programme.
The warmest month is July (29.9 °C on average) and the coldest is January (15.6 °C). Rainfall peaks in September.
McAllen averages 1 frost days, 204 hot days (≥ 30 °C) and 76 rainy days per year.
McAllen has warmed by +1.3 °C between 1940 and 2025, or +0.15 °C per decade. This trend is statistically significant.
The hottest day of the period reached 43.5 °C (on 15 June 1998) and the coldest -7.2 °C (on 25 December 1983).
Data from ERA5 reanalysis (Copernicus Climate Change Service), redistributed under a CC-BY 4.0 licence. Normals are recomputed whenever the archive is updated.
Climate normals · ERA5
McAllenTexas
- coords
- 26.20°, -98.23°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
23.7°C
Average daily high
29.7°C
Average daily low
19.1°C
Annual rainfall
525mm
Sunshine / day
10.0h
Mean relative humidity
69%
Average peak wind
23.9km/h
Seasonal range
14.3°C
Frost days (< 0 °C)
1 d/yr
Hot days (≥ 30 °C)
204 d/yr
Rainy days (≥ 1 mm)
76 d/yr
Annual snowfall
0.2 cm
Average feels-like high
30.4 °C
Average feels-like low
19.7 °C
Average peak gust
42.2 km/h
Tropical nights (≥ 20 °C)
199 d/yr
Solar radiation
18.3 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.26 · p = < 0.001
Trend fitted by linear regression (ordinary least squares) on annual means. A trend is shown only when it is statistically significant (p < 0.05).
A climograph overlays rainfall (bars) and temperature (line): the standard reading in climatology, where you can see at a glance whether the warm season is also the dry one.
Records for the period
Hottest day
43.5 °C
15 June 1998
Coldest day
-7.2 °C
25 December 1983
Wettest day
221 mm
21 September 1967
Windiest day
73.2 km/h
20 September 1967
Strongest gust
133.6 km/h
9 August 1980
Hottest feels-like
48.5 °C
10 May 2006
Coldest feels-like
-14.3 °C
25 December 1983
Snowiest day
4.8 cm
24 December 2004
Sunniest day
13.0 h
9 July 2025
Normals computed over complete calendar years 1940–2025.
A specific year
Pick a year and see how it compares to normal — warmer, drier or more extreme than usual?
Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 19.3 °C | -2.2 °C | 29 mm | -2 mm |
| Feb | 25.4 °C | +1.6 °C | 6 mm | -23 mm |
| Mar | 31.2 °C | +3.9 °C | 85 mm | +52 mm |
| Apr | 31.7 °C | +1.0 °C | 7 mm | -37 mm |
| May | 34.7 °C | +1.6 °C | 67 mm | +9 mm |
| Jun | 35.4 °C | +0.2 °C | 57 mm | +8 mm |
| Jul | 35.4 °C | -0.7 °C | 76 mm | +33 mm |
| Aug | 37.7 °C | +1.5 °C | 40 mm | -8 mm |
| Sep | 34.7 °C | +1.4 °C | 84 mm | +2 mm |
| Oct | 33.9 °C | +3.5 °C | 10 mm | -40 mm |
| Nov | 30.4 °C | +4.4 °C | 13 mm | -18 mm |
| Dec | 25.7 °C | +3.0 °C | 12 mm | -16 mm |
The year's extremes
What was the weather like that day?
Your birthday, a wedding, a memorable trip: discover the actual weather for any date since 1940.
Frequently asked questions
What is the climate of McAllen?
McAllen has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 23.7 °C and it receives 525 mm of precipitation per year.
What is the hottest day ever recorded in McAllen?
The hottest day measured in McAllen between 1940 and 2025 was 15 June 1998, reaching 43.5 °C.
What is the coldest day in McAllen?
The coldest day measured in McAllen between 1940 and 2025 was 25 December 1983, at -7.2 °C.
Does it snow in McAllen?
Almost never: McAllen sees virtually no snow, with about 1 frost days per year.
Has the climate of McAllen warmed?
Yes: McAllen warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in McAllen?
The wettest day measured in McAllen between 1940 and 2025 was 21 September 1967, with 221 mm of rain in 24 hours.
What was the windiest day in McAllen?
The windiest day measured in McAllen between 1940 and 2025 was 20 September 1967, with winds reaching 73.2 km/h.
What is the warmest month in McAllen?
The warmest month in McAllen is July (29.9 °C on average); the coldest is January (15.6 °C).
How much does it rain in McAllen?
McAllen receives on average 525 mm of precipitation per year, spread over about 76 rainy days.
Is it sunny in McAllen?
McAllen gets on average 10.0 hours of sunshine per day, roughly 3,650 hours per year over 1940-2025.
What is the biggest single-day snowfall in McAllen?
The heaviest 24-hour snowfall measured in McAllen between 1940 and 2025 was 24 December 2004, with 4.8 cm.
Are there tropical nights in McAllen?
Yes: McAllen has on average 199 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in McAllen?
In McAllen, between 1940 and 2025, the highest apparent temperature reached 48.5 °C on 10 May 2006, and the lowest was -14.3 °C on 25 December 1983.
Compare McAllen with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around McAllen