Alvin climate — normals and trends
Alvin (United States) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 20.6 °C and it receives 1,121 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 (28.0 °C on average) and the coldest is January (11.8 °C). Rainfall peaks in September.
Alvin averages 6 frost days, 110 hot days (≥ 30 °C) and 131 rainy days per year.
Alvin has warmed by +1.5 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The hottest day of the period reached 41.5 °C (on 27 August 2023) and the coldest -13.6 °C (on 31 January 1949).
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
AlvinTexas
- coords
- 29.42°, -95.24°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
20.6°C
Average daily high
25.3°C
Average daily low
16.6°C
Annual rainfall
1,121mm
Sunshine / day
9.6h
Mean relative humidity
76%
Average peak wind
19.1km/h
Seasonal range
16.2°C
Frost days (< 0 °C)
6 d/yr
Hot days (≥ 30 °C)
110 d/yr
Rainy days (≥ 1 mm)
131 d/yr
Annual snowfall
0.7 cm
Average feels-like high
26.7 °C
Average feels-like low
17.0 °C
Average peak gust
36.3 km/h
Tropical nights (≥ 20 °C)
158 d/yr
Solar radiation
16.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.5 °C
since 1940
+0.2 °C per decade · r² = 0.41 · 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
41.5 °C
27 August 2023
Coldest day
-13.6 °C
31 January 1949
Wettest day
240 mm
11 September 1961
Windiest day
85.8 km/h
11 September 1961
Strongest gust
155.2 km/h
13 September 2008
Hottest feels-like
45.1 °C
24 August 2023
Coldest feels-like
-19.4 °C
23 December 1989
Snowiest day
12.6 cm
30 January 1949
Sunniest day
13.4 h
2 June 1948
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 | 14.3 °C | -2.4 °C | 137 mm | +43 mm |
| Feb | 20.1 °C | +1.7 °C | 59 mm | -20 mm |
| Mar | 24.9 °C | +3.2 °C | 70 mm | -9 mm |
| Apr | 26.7 °C | +1.6 °C | 81 mm | -9 mm |
| May | 29.3 °C | +0.9 °C | 172 mm | +69 mm |
| Jun | 31.2 °C | 0.0 °C | 187 mm | +88 mm |
| Jul | 32.4 °C | +0.2 °C | 82 mm | -11 mm |
| Aug | 31.8 °C | -0.6 °C | 217 mm | +119 mm |
| Sep | 30.5 °C | +0.2 °C | 114 mm | -1 mm |
| Oct | 28.8 °C | +2.0 °C | 55 mm | -30 mm |
| Nov | 24.9 °C | +3.2 °C | 87 mm | -8 mm |
| Dec | 20.4 °C | +2.1 °C | 63 mm | -28 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 Alvin?
Alvin has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 20.6 °C and it receives 1,121 mm of precipitation per year.
What is the hottest day ever recorded in Alvin?
The hottest day measured in Alvin between 1940 and 2025 was 27 August 2023, reaching 41.5 °C.
What is the coldest day in Alvin?
The coldest day measured in Alvin between 1940 and 2025 was 31 January 1949, at -13.6 °C.
Does it snow in Alvin?
Almost never: Alvin sees virtually no snow, with about 6 frost days per year.
Has the climate of Alvin warmed?
Yes: Alvin warmed by +1.5 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Alvin?
The wettest day measured in Alvin between 1940 and 2025 was 11 September 1961, with 240 mm of rain in 24 hours.
What was the windiest day in Alvin?
The windiest day measured in Alvin between 1940 and 2025 was 11 September 1961, with winds reaching 85.8 km/h.
What is the warmest month in Alvin?
The warmest month in Alvin is July (28.0 °C on average); the coldest is January (11.8 °C).
How much does it rain in Alvin?
Alvin receives on average 1,121 mm of precipitation per year, spread over about 131 rainy days.
Is it sunny in Alvin?
Alvin gets on average 9.6 hours of sunshine per day, roughly 3,504 hours per year over 1940-2025.
What is the biggest single-day snowfall in Alvin?
The heaviest 24-hour snowfall measured in Alvin between 1940 and 2025 was 30 January 1949, with 12.6 cm.
Are there tropical nights in Alvin?
Yes: Alvin has on average 158 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Alvin?
In Alvin, between 1940 and 2025, the highest apparent temperature reached 45.1 °C on 24 August 2023, and the lowest was -19.4 °C on 23 December 1989.
Compare Alvin with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Alvin