Trelew climate — normals and trends
Trelew (Argentina) has a cold semi-arid climate (BSk) under the Köppen-Geiger classification. Its mean annual temperature is 13.9 °C and it receives 214 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 (21.1 °C on average) and the coldest is July (6.4 °C). Rainfall peaks in May.
Trelew averages 20 frost days, 29 hot days (≥ 30 °C) and 44 rainy days per year.
Trelew has warmed by +1.1 °C between 1940 and 2025, or +0.13 °C per decade. This trend is statistically significant.
The hottest day of the period reached 42.8 °C (on 12 January 2025) and the coldest -9.0 °C (on 1 July 2025).
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
TrelewChubut
- coords
- -43.25°, -65.31°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
13.9°C
Average daily high
19.7°C
Average daily low
9.0°C
Annual rainfall
214mm
Sunshine / day
10.4h
Mean relative humidity
51%
Average peak wind
27.4km/h
Seasonal range
14.7°C
Frost days (< 0 °C)
20 d/yr
Hot days (≥ 30 °C)
29 d/yr
Rainy days (≥ 1 mm)
44 d/yr
Annual snowfall
0.8 cm
Average feels-like high
15.7 °C
Average feels-like low
5.0 °C
Average peak gust
48.2 km/h
Tropical nights (≥ 20 °C)
5 d/yr
Solar radiation
17.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.1 °C
since 1940
+0.1 °C per decade · r² = 0.40 · 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
42.8 °C
12 January 2025
Coldest day
-9.0 °C
1 July 2025
Wettest day
83 mm
30 January 1985
Windiest day
76.1 km/h
28 October 1988
Strongest gust
124.9 km/h
28 October 1988
Hottest feels-like
39.4 °C
30 January 2025
Coldest feels-like
-13.9 °C
22 July 2001
Snowiest day
5.4 cm
27 June 1982
Sunniest day
15.0 h
4 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 | 28.5 °C | +1.2 °C | 6 mm | -13 mm |
| Feb | 26.4 °C | 0.0 °C | 10 mm | -10 mm |
| Mar | 25.0 °C | +1.1 °C | 22 mm | +4 mm |
| Apr | 19.2 °C | -0.5 °C | 27 mm | +9 mm |
| May | 15.8 °C | +0.6 °C | 8 mm | -12 mm |
| Jun | 12.4 °C | +0.8 °C | 8 mm | -11 mm |
| Jul | 13.8 °C | +2.3 °C | 12 mm | -6 mm |
| Aug | 15.4 °C | +1.4 °C | 10 mm | -4 mm |
| Sep | 17.6 °C | +0.8 °C | 15 mm | -2 mm |
| Oct | 22.4 °C | +2.2 °C | 3 mm | -14 mm |
| Nov | 23.5 °C | 0.0 °C | 22 mm | +3 mm |
| Dec | 27.1 °C | +1.4 °C | 2 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 Trelew?
Trelew has a cold semi-arid climate (Köppen BSk). Over 1940-2025, the average annual temperature is 13.9 °C and it receives 214 mm of precipitation per year.
What is the hottest day ever recorded in Trelew?
The hottest day measured in Trelew between 1940 and 2025 was 12 January 2025, reaching 42.8 °C.
What is the coldest day in Trelew?
The coldest day measured in Trelew between 1940 and 2025 was 1 July 2025, at -9.0 °C.
Does it snow in Trelew?
Almost never: Trelew sees virtually no snow, with about 20 frost days per year.
Has the climate of Trelew warmed?
Yes: Trelew warmed by +1.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Trelew?
The wettest day measured in Trelew between 1940 and 2025 was 30 January 1985, with 83 mm of rain in 24 hours.
What was the windiest day in Trelew?
The windiest day measured in Trelew between 1940 and 2025 was 28 October 1988, with winds reaching 76.1 km/h.
What is the warmest month in Trelew?
The warmest month in Trelew is January (21.1 °C on average); the coldest is July (6.4 °C).
How much does it rain in Trelew?
Trelew receives on average 214 mm of precipitation per year, spread over about 44 rainy days.
Is it sunny in Trelew?
Trelew gets on average 10.4 hours of sunshine per day, roughly 3,796 hours per year over 1940-2025.
What is the biggest single-day snowfall in Trelew?
The heaviest 24-hour snowfall measured in Trelew between 1940 and 2025 was 27 June 1982, with 5.4 cm.
Are there tropical nights in Trelew?
Yes: Trelew has on average 5 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Trelew?
In Trelew, between 1940 and 2025, the highest apparent temperature reached 39.4 °C on 30 January 2025, and the lowest was -13.9 °C on 22 July 2001.
Compare Trelew with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Trelew