Ciudad Altamirano climate — normals and trends
Ciudad Altamirano (Mexico) has a hot semi-arid climate (BSh) under the Köppen-Geiger classification. Its mean annual temperature is 27.6 °C and it receives 709 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 May (31.3 °C on average) and the coldest is January (24.9 °C). Rainfall peaks in September.
Ciudad Altamirano averages 0 frost days, 323 hot days (≥ 30 °C) and 92 rainy days per year.
Ciudad Altamirano has warmed by +3.1 °C between 1940 and 2025, or +0.36 °C per decade. This trend is statistically significant.
The hottest day of the period reached 44.9 °C (on 13 May 1980) and the coldest 10.5 °C (on 12 January 1997).
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
Ciudad AltamiranoGuerrero
- coords
- 18.36°, -100.67°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
27.6°C
Average daily high
33.9°C
Average daily low
21.7°C
Annual rainfall
709mm
Sunshine / day
11.0h
Mean relative humidity
52%
Average peak wind
7.4km/h
Seasonal range
6.4°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
323 d/yr
Rainy days (≥ 1 mm)
92 d/yr
Annual snowfall
0.0 cm
Average feels-like high
36.1 °C
Average feels-like low
23.5 °C
Average peak gust
25.5 km/h
Tropical nights (≥ 20 °C)
264 d/yr
Solar radiation
21.2 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+3.1 °C
since 1940
+0.4 °C per decade · r² = 0.77 · 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
44.9 °C
13 May 1980
Coldest day
10.5 °C
12 January 1997
Wettest day
113 mm
26 September 2024
Windiest day
18.5 km/h
30 March 1950
Strongest gust
56.5 km/h
8 October 1976
Hottest feels-like
47.3 °C
15 June 1998
Coldest feels-like
8.9 °C
13 January 1997
Sunniest day
12.8 h
26 May 2025
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 | 33.8 °C | +1.9 °C | 23 mm | +6 mm |
| Feb | 36.7 °C | +2.8 °C | 0 mm | -6 mm |
| Mar | 38.6 °C | +2.2 °C | 0 mm | -3 mm |
| Apr | 39.2 °C | +0.7 °C | 0 mm | -1 mm |
| May | 39.6 °C | +0.9 °C | 7 mm | -5 mm |
| Jun | 33.6 °C | -1.1 °C | 226 mm | +98 mm |
| Jul | 35.1 °C | +2.3 °C | 57 mm | -72 mm |
| Aug | 36.1 °C | +3.4 °C | 79 mm | -56 mm |
| Sep | 35.2 °C | +3.7 °C | 119 mm | -56 mm |
| Oct | 34.3 °C | +2.5 °C | 95 mm | +16 mm |
| Nov | 36.0 °C | +3.6 °C | 0 mm | -17 mm |
| Dec | 35.2 °C | +3.3 °C | 0 mm | -6 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 Ciudad Altamirano?
Ciudad Altamirano has a hot semi-arid climate (Köppen BSh). Over 1940-2025, the average annual temperature is 27.6 °C and it receives 709 mm of precipitation per year.
What is the hottest day ever recorded in Ciudad Altamirano?
The hottest day measured in Ciudad Altamirano between 1940 and 2025 was 13 May 1980, reaching 44.9 °C.
What is the coldest day in Ciudad Altamirano?
The coldest day measured in Ciudad Altamirano between 1940 and 2025 was 12 January 1997, at 10.5 °C.
Does it snow in Ciudad Altamirano?
Almost never: Ciudad Altamirano sees virtually no snow, with about 0 frost days per year.
Has the climate of Ciudad Altamirano warmed?
Yes: Ciudad Altamirano warmed by +3.1 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ciudad Altamirano?
The wettest day measured in Ciudad Altamirano between 1940 and 2025 was 26 September 2024, with 113 mm of rain in 24 hours.
What was the windiest day in Ciudad Altamirano?
The windiest day measured in Ciudad Altamirano between 1940 and 2025 was 30 March 1950, with winds reaching 18.5 km/h.
What is the warmest month in Ciudad Altamirano?
The warmest month in Ciudad Altamirano is May (31.3 °C on average); the coldest is January (24.9 °C).
How much does it rain in Ciudad Altamirano?
Ciudad Altamirano receives on average 709 mm of precipitation per year, spread over about 92 rainy days.
Is it sunny in Ciudad Altamirano?
Ciudad Altamirano gets on average 11.0 hours of sunshine per day, roughly 4,015 hours per year over 1940-2025.
Are there tropical nights in Ciudad Altamirano?
Yes: Ciudad Altamirano has on average 264 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Ciudad Altamirano?
In Ciudad Altamirano, between 1940 and 2025, the highest apparent temperature reached 47.3 °C on 15 June 1998, and the lowest was 8.9 °C on 13 January 1997.
Compare Ciudad Altamirano with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Ciudad Altamirano