Altkirch climate — normals and trends
Altkirch (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 9.2 °C and it receives 1,202 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 July (18.3 °C on average) and the coldest is January (0.2 °C). Rainfall peaks in May.
Altkirch averages 82 frost days, 5 hot days (≥ 30 °C) and 171 rainy days per year.
Altkirch has warmed by +2.3 °C between 1940 and 2025, or +0.27 °C per decade. This trend is statistically significant.
The number of frost days there went from about 102 to 62 per year over the period.
The hottest day of the period reached 36.6 °C (on 7 August 2015) and the coldest -25.6 °C (on 14 January 1963).
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
AltkirchGrand Est
- coords
- 47.62°, 7.24°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
9.2°C
Average daily high
13.3°C
Average daily low
5.5°C
Annual rainfall
1,202mm
Sunshine / day
8.2h
Mean relative humidity
79%
Average peak wind
12.7km/h
Seasonal range
18.1°C
Frost days (< 0 °C)
82 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
171 d/yr
Annual snowfall
75.5 cm
Average feels-like high
11.5 °C
Average feels-like low
3.2 °C
Average peak gust
31.3 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
12.0 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+2.3 °C
since 1940
+0.3 °C per decade · r² = 0.54 · 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
36.6 °C
7 August 2015
Coldest day
-25.6 °C
14 January 1963
Wettest day
71 mm
26 September 1987
Windiest day
53.3 km/h
26 December 1999
Strongest gust
137.9 km/h
26 December 1999
Hottest feels-like
38.7 °C
5 July 2015
Coldest feels-like
-30.6 °C
14 January 1963
Snowiest day
27.9 cm
4 March 2006
Sunniest day
15.0 h
16 May 1940
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 | 6.0 °C | +2.9 °C | 123 mm | +39 mm |
| Feb | 6.7 °C | +1.5 °C | 71 mm | -7 mm |
| Mar | 12.1 °C | +2.5 °C | 56 mm | -29 mm |
| Apr | 16.5 °C | +3.1 °C | 89 mm | -7 mm |
| May | 18.9 °C | +1.4 °C | 102 mm | -24 mm |
| Jun | 25.9 °C | +5.0 °C | 127 mm | +3 mm |
| Jul | 23.7 °C | +0.6 °C | 132 mm | +18 mm |
| Aug | 25.5 °C | +2.8 °C | 170 mm | +45 mm |
| Sep | 19.1 °C | 0.0 °C | 183 mm | +84 mm |
| Oct | 14.1 °C | +0.3 °C | 123 mm | +36 mm |
| Nov | 9.1 °C | +1.6 °C | 130 mm | +34 mm |
| Dec | 6.1 °C | +2.2 °C | 27 mm | -64 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 Altkirch?
Altkirch has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 9.2 °C and it receives 1,202 mm of precipitation per year.
What is the hottest day ever recorded in Altkirch?
The hottest day measured in Altkirch between 1940 and 2025 was 7 August 2015, reaching 36.6 °C.
What is the coldest day in Altkirch?
The coldest day measured in Altkirch between 1940 and 2025 was 14 January 1963, at -25.6 °C.
Does it snow in Altkirch?
Yes. Altkirch gets on average 75.5 cm of snow per year and has around 82 frost days.
Has the climate of Altkirch warmed?
Yes: Altkirch warmed by +2.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Altkirch?
The wettest day measured in Altkirch between 1940 and 2025 was 26 September 1987, with 71 mm of rain in 24 hours.
What was the windiest day in Altkirch?
The windiest day measured in Altkirch between 1940 and 2025 was 26 December 1999, with winds reaching 53.3 km/h.
What is the warmest month in Altkirch?
The warmest month in Altkirch is July (18.3 °C on average); the coldest is January (0.2 °C).
How much does it rain in Altkirch?
Altkirch receives on average 1,202 mm of precipitation per year, spread over about 171 rainy days.
Is it sunny in Altkirch?
Altkirch 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 Altkirch?
The heaviest 24-hour snowfall measured in Altkirch between 1940 and 2025 was 4 March 2006, with 27.9 cm.
Are there tropical nights in Altkirch?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Altkirch.
What was the most extreme apparent temperature in Altkirch?
In Altkirch, between 1940 and 2025, the highest apparent temperature reached 38.7 °C on 5 July 2015, and the lowest was -30.6 °C on 14 January 1963.
Compare Altkirch with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Altkirch