Arauco climate — normals and trends
Arauco (Chile) has a warm-summer mediterranean climate (Csb) under the Köppen-Geiger classification. Its mean annual temperature is 12.5 °C and it receives 1,098 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 (17.5 °C on average) and the coldest is July (8.1 °C). Rainfall peaks in June.
Arauco averages 7 frost days, 1 hot days (≥ 30 °C) and 91 rainy days per year.
No statistically significant temperature trend emerges for Arauco between 1940 and 2025: over this span, year-to-year swings outweigh the climate signal.
The hottest day of the period reached 38.1 °C (on 3 February 2023) and the coldest -4.7 °C (on 13 June 1967).
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
AraucoBiobio
- coords
- -37.25°, -73.32°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.5°C
Average daily high
17.5°C
Average daily low
7.8°C
Annual rainfall
1,098mm
Sunshine / day
10.2h
Mean relative humidity
77%
Average peak wind
18.0km/h
Seasonal range
9.4°C
Frost days (< 0 °C)
7 d/yr
Hot days (≥ 30 °C)
1 d/yr
Rainy days (≥ 1 mm)
91 d/yr
Annual snowfall
0.0 cm
Average feels-like high
16.5 °C
Average feels-like low
5.5 °C
Average peak gust
39.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
18.5 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
38.1 °C
3 February 2023
Coldest day
-4.7 °C
13 June 1967
Wettest day
120 mm
27 May 1953
Windiest day
50.4 km/h
23 July 1987
Strongest gust
132.8 km/h
11 July 1987
Hottest feels-like
38.3 °C
3 February 2023
Coldest feels-like
-8.6 °C
13 June 1967
Snowiest day
1.0 cm
13 June 1947
Sunniest day
14.4 h
13 December 2020
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 | 25.3 °C | +1.7 °C | 7 mm | -7 mm |
| Feb | 24.6 °C | +1.0 °C | 3 mm | -10 mm |
| Mar | 22.5 °C | +0.9 °C | 42 mm | +19 mm |
| Apr | 17.3 °C | -0.7 °C | 77 mm | +7 mm |
| May | 14.1 °C | -0.3 °C | 103 mm | -87 mm |
| Jun | 11.9 °C | -0.4 °C | 157 mm | -75 mm |
| Jul | 13.1 °C | +1.2 °C | 182 mm | -22 mm |
| Aug | 13.9 °C | +1.1 °C | 102 mm | -52 mm |
| Sep | 14.7 °C | +0.2 °C | 104 mm | +14 mm |
| Oct | 18.2 °C | +1.6 °C | 33 mm | -25 mm |
| Nov | 21.0 °C | +1.7 °C | 13 mm | -18 mm |
| Dec | 23.6 °C | +1.8 °C | 19 mm | -3 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 Arauco?
Arauco has a warm-summer mediterranean climate (Köppen Csb). Over 1940-2025, the average annual temperature is 12.5 °C and it receives 1,098 mm of precipitation per year.
What is the hottest day ever recorded in Arauco?
The hottest day measured in Arauco between 1940 and 2025 was 3 February 2023, reaching 38.1 °C.
What is the coldest day in Arauco?
The coldest day measured in Arauco between 1940 and 2025 was 13 June 1967, at -4.7 °C.
Does it snow in Arauco?
Almost never: Arauco sees virtually no snow, with about 7 frost days per year.
Has the climate of Arauco warmed?
Between 1940 and 2025, no statistically significant temperature trend emerges in Arauco.
What is the wettest day in Arauco?
The wettest day measured in Arauco between 1940 and 2025 was 27 May 1953, with 120 mm of rain in 24 hours.
What was the windiest day in Arauco?
The windiest day measured in Arauco between 1940 and 2025 was 23 July 1987, with winds reaching 50.4 km/h.
What is the warmest month in Arauco?
The warmest month in Arauco is January (17.5 °C on average); the coldest is July (8.1 °C).
How much does it rain in Arauco?
Arauco receives on average 1,098 mm of precipitation per year, spread over about 91 rainy days.
Is it sunny in Arauco?
Arauco gets on average 10.2 hours of sunshine per day, roughly 3,723 hours per year over 1940-2025.
What is the biggest single-day snowfall in Arauco?
The heaviest 24-hour snowfall measured in Arauco between 1940 and 2025 was 13 June 1947, with 1.0 cm.
Are there tropical nights in Arauco?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Arauco.
What was the most extreme apparent temperature in Arauco?
In Arauco, between 1940 and 2025, the highest apparent temperature reached 38.3 °C on 3 February 2023, and the lowest was -8.6 °C on 13 June 1967.
Compare Arauco with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Arauco