Castro climate — normals and trends
Castro (Chile) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.2 °C and it receives 1,532 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 (14.2 °C on average) and the coldest is July (6.5 °C). Rainfall peaks in June.
Castro averages 13 frost days, 0 hot days (≥ 30 °C) and 186 rainy days per year.
Castro has warmed by +1.4 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The number of frost days there went from about 11 to 15 per year over the period.
The hottest day of the period reached 35.3 °C (on 25 January 1944) and the coldest -7.7 °C (on 30 June 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
CastroLos Lagos Region
- coords
- -42.47°, -73.77°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.2°C
Average daily high
14.2°C
Average daily low
6.4°C
Annual rainfall
1,532mm
Sunshine / day
8.2h
Mean relative humidity
82%
Average peak wind
15.4km/h
Seasonal range
7.7°C
Frost days (< 0 °C)
13 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
186 d/yr
Annual snowfall
1.4 cm
Average feels-like high
12.5 °C
Average feels-like low
4.0 °C
Average peak gust
39.2 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.45 · 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
35.3 °C
25 January 1944
Coldest day
-7.7 °C
30 June 2025
Wettest day
77 mm
12 March 1961
Windiest day
45.3 km/h
1 August 1969
Strongest gust
127.4 km/h
20 December 2008
Hottest feels-like
37.7 °C
29 January 2008
Coldest feels-like
-11.0 °C
30 June 2025
Snowiest day
8.5 cm
15 June 2017
Sunniest day
15.0 h
20 December 1941
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 | 20.2 °C | +1.3 °C | 35 mm | -38 mm |
| Feb | 18.8 °C | -0.4 °C | 35 mm | -25 mm |
| Mar | 17.2 °C | -0.1 °C | 137 mm | +50 mm |
| Apr | 14.6 °C | +0.1 °C | 128 mm | +6 mm |
| May | 12.1 °C | +0.2 °C | 235 mm | +53 mm |
| Jun | 10.1 °C | +0.2 °C | 189 mm | -8 mm |
| Jul | 11.0 °C | +1.5 °C | 183 mm | -9 mm |
| Aug | 12.3 °C | +1.9 °C | 143 mm | -40 mm |
| Sep | 13.4 °C | +1.3 °C | 166 mm | +21 mm |
| Oct | 14.6 °C | +0.7 °C | 138 mm | +18 mm |
| Nov | 19.0 °C | +3.4 °C | 32 mm | -60 mm |
| Dec | 18.6 °C | +1.1 °C | 55 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 Castro?
Castro has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.2 °C and it receives 1,532 mm of precipitation per year.
What is the hottest day ever recorded in Castro?
The hottest day measured in Castro between 1940 and 2025 was 25 January 1944, reaching 35.3 °C.
What is the coldest day in Castro?
The coldest day measured in Castro between 1940 and 2025 was 30 June 2025, at -7.7 °C.
Does it snow in Castro?
Yes. Castro gets on average 1.4 cm of snow per year and has around 13 frost days.
Has the climate of Castro warmed?
Yes: Castro warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Castro?
The wettest day measured in Castro between 1940 and 2025 was 12 March 1961, with 77 mm of rain in 24 hours.
What was the windiest day in Castro?
The windiest day measured in Castro between 1940 and 2025 was 1 August 1969, with winds reaching 45.3 km/h.
What is the warmest month in Castro?
The warmest month in Castro is January (14.2 °C on average); the coldest is July (6.5 °C).
How much does it rain in Castro?
Castro receives on average 1,532 mm of precipitation per year, spread over about 186 rainy days.
Is it sunny in Castro?
Castro gets on average 8.2 hours of sunshine per day, roughly 2,993 hours per year over 1940-2025.
What is the biggest single-day snowfall in Castro?
The heaviest 24-hour snowfall measured in Castro between 1940 and 2025 was 15 June 2017, with 8.5 cm.
Are there tropical nights in Castro?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Castro.
What was the most extreme apparent temperature in Castro?
In Castro, between 1940 and 2025, the highest apparent temperature reached 37.7 °C on 29 January 2008, and the lowest was -11.0 °C on 30 June 2025.
Compare Castro with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Castro