Castaños climate — normals and trends
Castaños (Mexico) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 20.0 °C and it receives 534 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 June (26.3 °C on average) and the coldest is January (11.6 °C). Rainfall peaks in September.
Castaños averages 5 frost days, 118 hot days (≥ 30 °C) and 87 rainy days per year.
Castaños has warmed by +2.1 °C between 1940 and 2025, or +0.25 °C per decade. This trend is statistically significant.
The hottest day of the period reached 42.6 °C (on 28 June 1957) and the coldest -11.6 °C (on 11 January 1962).
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
CastañosCoahuila
- coords
- 26.79°, -101.43°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
20.0°C
Average daily high
25.9°C
Average daily low
14.5°C
Annual rainfall
534mm
Sunshine / day
10.7h
Mean relative humidity
59%
Average peak wind
13.0km/h
Seasonal range
14.7°C
Frost days (< 0 °C)
5 d/yr
Hot days (≥ 30 °C)
118 d/yr
Rainy days (≥ 1 mm)
87 d/yr
Annual snowfall
2.0 cm
Average feels-like high
25.8 °C
Average feels-like low
14.3 °C
Average peak gust
32.7 km/h
Tropical nights (≥ 20 °C)
96 d/yr
Solar radiation
20.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.1 °C
since 1940
+0.3 °C per decade · r² = 0.38 · 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
42.6 °C
28 June 1957
Coldest day
-11.6 °C
11 January 1962
Wettest day
219 mm
22 September 1967
Windiest day
35.3 km/h
18 March 2008
Strongest gust
90.0 km/h
10 August 1980
Hottest feels-like
43.0 °C
18 June 2023
Coldest feels-like
-16.4 °C
11 January 1962
Snowiest day
12.3 cm
12 February 1960
Sunniest day
13.6 h
28 June 2023
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 | 16.2 °C | -1.9 °C | 6 mm | -13 mm |
| Feb | 24.4 °C | +3.6 °C | 2 mm | -13 mm |
| Mar | 29.3 °C | +4.6 °C | 7 mm | -10 mm |
| Apr | 31.8 °C | +3.3 °C | 12 mm | -19 mm |
| May | 32.2 °C | +1.5 °C | 60 mm | +5 mm |
| Jun | 34.1 °C | +2.1 °C | 29 mm | -32 mm |
| Jul | 30.5 °C | -1.1 °C | 139 mm | +69 mm |
| Aug | 33.4 °C | +2.2 °C | 39 mm | -32 mm |
| Sep | 29.7 °C | +1.9 °C | 65 mm | -47 mm |
| Oct | 29.4 °C | +4.1 °C | 8 mm | -38 mm |
| Nov | 26.3 °C | +4.7 °C | 5 mm | -13 mm |
| Dec | 23.2 °C | +4.2 °C | 11 mm | -7 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 Castaños?
Castaños has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 20.0 °C and it receives 534 mm of precipitation per year.
What is the hottest day ever recorded in Castaños?
The hottest day measured in Castaños between 1940 and 2025 was 28 June 1957, reaching 42.6 °C.
What is the coldest day in Castaños?
The coldest day measured in Castaños between 1940 and 2025 was 11 January 1962, at -11.6 °C.
Does it snow in Castaños?
Yes. Castaños gets on average 2.0 cm of snow per year and has around 5 frost days.
Has the climate of Castaños warmed?
Yes: Castaños warmed by +2.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Castaños?
The wettest day measured in Castaños between 1940 and 2025 was 22 September 1967, with 219 mm of rain in 24 hours.
What was the windiest day in Castaños?
The windiest day measured in Castaños between 1940 and 2025 was 18 March 2008, with winds reaching 35.3 km/h.
What is the warmest month in Castaños?
The warmest month in Castaños is June (26.3 °C on average); the coldest is January (11.6 °C).
How much does it rain in Castaños?
Castaños receives on average 534 mm of precipitation per year, spread over about 87 rainy days.
Is it sunny in Castaños?
Castaños gets on average 10.7 hours of sunshine per day, roughly 3,905 hours per year over 1940-2025.
What is the biggest single-day snowfall in Castaños?
The heaviest 24-hour snowfall measured in Castaños between 1940 and 2025 was 12 February 1960, with 12.3 cm.
Are there tropical nights in Castaños?
Yes: Castaños has on average 96 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Castaños?
In Castaños, between 1940 and 2025, the highest apparent temperature reached 43.0 °C on 18 June 2023, and the lowest was -16.4 °C on 11 January 1962.
Compare Castaños with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Castaños