Tres Arroyos climate — normals and trends
Tres Arroyos (Argentina) has a humid subtropical climate (Cfa) under the Köppen-Geiger classification. Its mean annual temperature is 14.7 °C and it receives 719 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 (22.0 °C on average) and the coldest is July (7.8 °C). Rainfall peaks in November.
Tres Arroyos averages 11 frost days, 36 hot days (≥ 30 °C) and 94 rainy days per year.
No statistically significant temperature trend emerges for Tres Arroyos between 1940 and 2025: over this span, year-to-year swings outweigh the climate signal.
The hottest day of the period reached 41.9 °C (on 20 January 1953) and the coldest -8.3 °C (on 5 July 1988).
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
Tres ArroyosBuenos Aires
- coords
- -38.38°, -60.28°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
14.7°C
Average daily high
20.4°C
Average daily low
9.6°C
Annual rainfall
719mm
Sunshine / day
9.8h
Mean relative humidity
68%
Average peak wind
22.4km/h
Seasonal range
14.2°C
Frost days (< 0 °C)
11 d/yr
Hot days (≥ 30 °C)
36 d/yr
Rainy days (≥ 1 mm)
94 d/yr
Annual snowfall
0.1 cm
Average feels-like high
18.5 °C
Average feels-like low
6.9 °C
Average peak gust
42.0 km/h
Tropical nights (≥ 20 °C)
9 d/yr
Solar radiation
17.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
No clear trend over this period
Over a short window, year-to-year swings outweigh the climate signal. Try 86 years.
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
41.9 °C
20 January 1953
Coldest day
-8.3 °C
5 July 1988
Wettest day
85 mm
16 March 1954
Windiest day
59.9 km/h
25 August 2014
Strongest gust
104.4 km/h
9 April 1952
Hottest feels-like
41.9 °C
20 January 1953
Coldest feels-like
-12.5 °C
5 July 1988
Snowiest day
2.2 cm
15 July 2010
Sunniest day
14.1 h
2 January 1940
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 | 30.1 °C | +1.5 °C | 29 mm | -50 mm |
| Feb | 30.3 °C | +2.8 °C | 44 mm | -26 mm |
| Mar | 23.6 °C | -1.2 °C | 170 mm | +93 mm |
| Apr | 19.2 °C | -1.4 °C | 56 mm | -0 mm |
| May | 17.4 °C | +1.0 °C | 50 mm | +3 mm |
| Jun | 12.7 °C | -0.4 °C | 20 mm | -14 mm |
| Jul | 12.9 °C | +0.2 °C | 19 mm | -18 mm |
| Aug | 15.0 °C | +0.5 °C | 46 mm | +6 mm |
| Sep | 17.3 °C | +0.5 °C | 77 mm | +28 mm |
| Oct | 20.2 °C | +0.5 °C | 108 mm | +31 mm |
| Nov | 22.8 °C | -0.6 °C | 100 mm | +21 mm |
| Dec | 29.8 °C | +2.9 °C | 33 mm | -41 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 Tres Arroyos?
Tres Arroyos has a humid subtropical climate (Köppen Cfa). Over 1940-2025, the average annual temperature is 14.7 °C and it receives 719 mm of precipitation per year.
What is the hottest day ever recorded in Tres Arroyos?
The hottest day measured in Tres Arroyos between 1940 and 2025 was 20 January 1953, reaching 41.9 °C.
What is the coldest day in Tres Arroyos?
The coldest day measured in Tres Arroyos between 1940 and 2025 was 5 July 1988, at -8.3 °C.
Does it snow in Tres Arroyos?
Almost never: Tres Arroyos sees virtually no snow, with about 11 frost days per year.
Has the climate of Tres Arroyos warmed?
Between 1940 and 2025, no statistically significant temperature trend emerges in Tres Arroyos.
What is the wettest day in Tres Arroyos?
The wettest day measured in Tres Arroyos between 1940 and 2025 was 16 March 1954, with 85 mm of rain in 24 hours.
What was the windiest day in Tres Arroyos?
The windiest day measured in Tres Arroyos between 1940 and 2025 was 25 August 2014, with winds reaching 59.9 km/h.
What is the warmest month in Tres Arroyos?
The warmest month in Tres Arroyos is January (22.0 °C on average); the coldest is July (7.8 °C).
How much does it rain in Tres Arroyos?
Tres Arroyos receives on average 719 mm of precipitation per year, spread over about 94 rainy days.
Is it sunny in Tres Arroyos?
Tres Arroyos gets on average 9.8 hours of sunshine per day, roughly 3,577 hours per year over 1940-2025.
What is the biggest single-day snowfall in Tres Arroyos?
The heaviest 24-hour snowfall measured in Tres Arroyos between 1940 and 2025 was 15 July 2010, with 2.2 cm.
Are there tropical nights in Tres Arroyos?
Yes: Tres Arroyos has on average 9 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Tres Arroyos?
In Tres Arroyos, between 1940 and 2025, the highest apparent temperature reached 41.9 °C on 20 January 1953, and the lowest was -12.5 °C on 5 July 1988.
Compare Tres Arroyos with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Tres Arroyos