Ajalpan climate — normals and trends
Ajalpan (Mexico) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 16.0 °C and it receives 804 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 (18.3 °C on average) and the coldest is January (13.0 °C). Rainfall peaks in June.
Ajalpan averages 0 frost days, 2 hot days (≥ 30 °C) and 146 rainy days per year.
Ajalpan has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.
The hottest day of the period reached 33.4 °C (on 9 May 1998) and the coldest -2.4 °C (on 25 February 1976).
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
AjalpanPuebla
- coords
- 18.38°, -97.26°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
16.0°C
Average daily high
22.2°C
Average daily low
11.0°C
Annual rainfall
804mm
Sunshine / day
10.9h
Mean relative humidity
75%
Average peak wind
12.5km/h
Seasonal range
5.3°C
Frost days (< 0 °C)
0 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
146 d/yr
Annual snowfall
0.0 cm
Average feels-like high
22.2 °C
Average feels-like low
10.2 °C
Average peak gust
38.7 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
20.6 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °C
since 1940
+0.3 °C per decade · r² = 0.75 · 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
33.4 °C
9 May 1998
Coldest day
-2.4 °C
25 February 1976
Wettest day
106 mm
9 September 2017
Windiest day
29.8 km/h
21 January 1987
Strongest gust
87.1 km/h
9 March 2016
Hottest feels-like
35.9 °C
8 May 2024
Coldest feels-like
-6.1 °C
31 January 1966
Snowiest day
0.2 cm
5 March 1987
Sunniest day
13.0 h
28 May 1940
Normals computed over complete calendar years 1940–2025.
A specific year
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Across the whole year
Month by month
| High | vs. normal | Precipitation | vs. normal | |
|---|---|---|---|---|
| Jan | 20.6 °C | +1.1 °C | 19 mm | +2 mm |
| Feb | 22.7 °C | +1.3 °C | 23 mm | +5 mm |
| Mar | 26.0 °C | +2.2 °C | 19 mm | -4 mm |
| Apr | 25.4 °C | +0.4 °C | 25 mm | -22 mm |
| May | 26.4 °C | +1.7 °C | 122 mm | +32 mm |
| Jun | 22.9 °C | -0.1 °C | 278 mm | +126 mm |
| Jul | 23.8 °C | +1.5 °C | 66 mm | -29 mm |
| Aug | 25.0 °C | +2.0 °C | 101 mm | +11 mm |
| Sep | 24.7 °C | +2.5 °C | 131 mm | -9 mm |
| Oct | 23.5 °C | +2.1 °C | 124 mm | +44 mm |
| Nov | 22.5 °C | +2.1 °C | 26 mm | -8 mm |
| Dec | 21.0 °C | +1.4 °C | 40 mm | +22 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 Ajalpan?
Ajalpan has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 16.0 °C and it receives 804 mm of precipitation per year.
What is the hottest day ever recorded in Ajalpan?
The hottest day measured in Ajalpan between 1940 and 2025 was 9 May 1998, reaching 33.4 °C.
What is the coldest day in Ajalpan?
The coldest day measured in Ajalpan between 1940 and 2025 was 25 February 1976, at -2.4 °C.
Does it snow in Ajalpan?
Almost never: Ajalpan sees virtually no snow, with about 0 frost days per year.
Has the climate of Ajalpan warmed?
Yes: Ajalpan warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Ajalpan?
The wettest day measured in Ajalpan between 1940 and 2025 was 9 September 2017, with 106 mm of rain in 24 hours.
What was the windiest day in Ajalpan?
The windiest day measured in Ajalpan between 1940 and 2025 was 21 January 1987, with winds reaching 29.8 km/h.
What is the warmest month in Ajalpan?
The warmest month in Ajalpan is May (18.3 °C on average); the coldest is January (13.0 °C).
How much does it rain in Ajalpan?
Ajalpan receives on average 804 mm of precipitation per year, spread over about 146 rainy days.
Is it sunny in Ajalpan?
Ajalpan gets on average 10.9 hours of sunshine per day, roughly 3,979 hours per year over 1940-2025.
What is the biggest single-day snowfall in Ajalpan?
The heaviest 24-hour snowfall measured in Ajalpan between 1940 and 2025 was 5 March 1987, with 0.2 cm.
Are there tropical nights in Ajalpan?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Ajalpan.
What was the most extreme apparent temperature in Ajalpan?
In Ajalpan, between 1940 and 2025, the highest apparent temperature reached 35.9 °C on 8 May 2024, and the lowest was -6.1 °C on 31 January 1966.
Compare Ajalpan with another city
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Nearby cities
The climate around Ajalpan