Allen climate — normals and trends
Allen (Argentina) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 15.4 °C and it receives 231 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 January (24.3 °C on average) and the coldest is July (6.5 °C). Rainfall peaks in October.
Allen averages 21 frost days, 64 hot days (≥ 30 °C) and 41 rainy days per year.
Allen has warmed by +0.4 °C between 1940 and 2025, or +0.05 °C per decade. This trend is statistically significant.
The number of frost days there went from about 18 to 24 per year over the period.
The hottest day of the period reached 42.4 °C (on 5 January 1955) and the coldest -9.5 °C (on 9 July 2007).
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
AllenRio Negro
- coords
- -38.98°, -67.83°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
15.4°C
Average daily high
21.7°C
Average daily low
9.7°C
Annual rainfall
231mm
Sunshine / day
10.5h
Mean relative humidity
49%
Average peak wind
21.3km/h
Seasonal range
17.8°C
Frost days (< 0 °C)
21 d/yr
Hot days (≥ 30 °C)
64 d/yr
Rainy days (≥ 1 mm)
41 d/yr
Annual snowfall
2.9 cm
Average feels-like high
18.6 °C
Average feels-like low
6.4 °C
Average peak gust
41.3 km/h
Tropical nights (≥ 20 °C)
15 d/yr
Solar radiation
18.8 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+0.4 °C
since 1940
+0.1 °C per decade · r² = 0.05 · p = 0.032
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
42.4 °C
5 January 1955
Coldest day
-9.5 °C
9 July 2007
Wettest day
59 mm
24 October 2016
Windiest day
59.2 km/h
13 August 1959
Strongest gust
113.4 km/h
5 October 2017
Hottest feels-like
42.8 °C
23 December 2013
Coldest feels-like
-14.1 °C
9 July 2007
Snowiest day
13.4 cm
17 June 1982
Sunniest day
14.7 h
29 December 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 | 34.4 °C | +3.2 °C | 2 mm | -13 mm |
| Feb | 31.9 °C | +2.0 °C | 8 mm | -10 mm |
| Mar | 26.4 °C | +0.1 °C | 38 mm | +16 mm |
| Apr | 20.2 °C | -0.8 °C | 12 mm | -11 mm |
| May | 18.0 °C | +1.9 °C | 6 mm | -16 mm |
| Jun | 14.4 °C | +2.0 °C | 3 mm | -17 mm |
| Jul | 12.8 °C | +0.6 °C | 23 mm | +5 mm |
| Aug | 16.7 °C | +1.7 °C | 8 mm | -6 mm |
| Sep | 20.1 °C | +1.7 °C | 14 mm | -7 mm |
| Oct | 24.9 °C | +2.7 °C | 3 mm | -22 mm |
| Nov | 27.6 °C | +1.0 °C | 32 mm | +14 mm |
| Dec | 31.1 °C | +1.5 °C | 1 mm | -14 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 Allen?
Allen has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 15.4 °C and it receives 231 mm of precipitation per year.
What is the hottest day ever recorded in Allen?
The hottest day measured in Allen between 1940 and 2025 was 5 January 1955, reaching 42.4 °C.
What is the coldest day in Allen?
The coldest day measured in Allen between 1940 and 2025 was 9 July 2007, at -9.5 °C.
Does it snow in Allen?
Yes. Allen gets on average 2.9 cm of snow per year and has around 21 frost days.
Has the climate of Allen warmed?
Yes: Allen warmed by +0.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Allen?
The wettest day measured in Allen between 1940 and 2025 was 24 October 2016, with 59 mm of rain in 24 hours.
What was the windiest day in Allen?
The windiest day measured in Allen between 1940 and 2025 was 13 August 1959, with winds reaching 59.2 km/h.
What is the warmest month in Allen?
The warmest month in Allen is January (24.3 °C on average); the coldest is July (6.5 °C).
How much does it rain in Allen?
Allen receives on average 231 mm of precipitation per year, spread over about 41 rainy days.
Is it sunny in Allen?
Allen gets on average 10.5 hours of sunshine per day, roughly 3,833 hours per year over 1940-2025.
What is the biggest single-day snowfall in Allen?
The heaviest 24-hour snowfall measured in Allen between 1940 and 2025 was 17 June 1982, with 13.4 cm.
Are there tropical nights in Allen?
Yes: Allen has on average 15 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Allen?
In Allen, between 1940 and 2025, the highest apparent temperature reached 42.8 °C on 23 December 2013, and the lowest was -14.1 °C on 9 July 2007.
Compare Allen with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Allen