Challans climate — normals and trends
Challans (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 12.7 °C and it receives 673 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 (19.0 °C on average) and the coldest is January (6.8 °C). Rainfall peaks in November.
Challans averages 11 frost days, 2 hot days (≥ 30 °C) and 124 rainy days per year.
Challans has warmed by +1.4 °C between 1940 and 2025, or +0.17 °C per decade. This trend is statistically significant.
The number of frost days there went from about 17 to 5 per year over the period.
The hottest day of the period reached 37.9 °C (on 18 July 2022) and the coldest -9.8 °C (on 12 January 1987).
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
ChallansPays de la Loire Region
- coords
- 46.85°, -1.88°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.7°C
Average daily high
15.3°C
Average daily low
10.3°C
Annual rainfall
673mm
Sunshine / day
9.1h
Mean relative humidity
81%
Average peak wind
24.7km/h
Seasonal range
12.2°C
Frost days (< 0 °C)
11 d/yr
Hot days (≥ 30 °C)
2 d/yr
Rainy days (≥ 1 mm)
124 d/yr
Annual snowfall
1.8 cm
Average feels-like high
13.3 °C
Average feels-like low
7.4 °C
Average peak gust
40.5 km/h
Tropical nights (≥ 20 °C)
2 d/yr
Solar radiation
13.4 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.4 °C
since 1940
+0.2 °C per decade · r² = 0.36 · 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
37.9 °C
18 July 2022
Coldest day
-9.8 °C
12 January 1987
Wettest day
65 mm
9 October 2024
Windiest day
84.3 km/h
27 September 1952
Strongest gust
140.8 km/h
27 December 1999
Hottest feels-like
38.8 °C
27 June 2019
Coldest feels-like
-18.5 °C
13 January 1987
Snowiest day
11.2 cm
26 January 1945
Sunniest day
15.4 h
19 June 2025
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 | 9.6 °C | +0.9 °C | 173 mm | +103 mm |
| Feb | 10.3 °C | +1.0 °C | 47 mm | -10 mm |
| Mar | 13.2 °C | +1.6 °C | 29 mm | -23 mm |
| Apr | 17.2 °C | +3.2 °C | 77 mm | +31 mm |
| May | 19.1 °C | +2.1 °C | 29 mm | -25 mm |
| Jun | 23.8 °C | +3.7 °C | 35 mm | -6 mm |
| Jul | 23.5 °C | +1.6 °C | 53 mm | +17 mm |
| Aug | 25.1 °C | +3.1 °C | 21 mm | -20 mm |
| Sep | 19.9 °C | -0.2 °C | 58 mm | +8 mm |
| Oct | 18.0 °C | +1.4 °C | 67 mm | -5 mm |
| Nov | 14.3 °C | +2.0 °C | 77 mm | -1 mm |
| Dec | 10.9 °C | +1.2 °C | 90 mm | +13 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 Challans?
Challans has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 12.7 °C and it receives 673 mm of precipitation per year.
What is the hottest day ever recorded in Challans?
The hottest day measured in Challans between 1940 and 2025 was 18 July 2022, reaching 37.9 °C.
What is the coldest day in Challans?
The coldest day measured in Challans between 1940 and 2025 was 12 January 1987, at -9.8 °C.
Does it snow in Challans?
Yes. Challans gets on average 1.8 cm of snow per year and has around 11 frost days.
Has the climate of Challans warmed?
Yes: Challans warmed by +1.4 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Challans?
The wettest day measured in Challans between 1940 and 2025 was 9 October 2024, with 65 mm of rain in 24 hours.
What was the windiest day in Challans?
The windiest day measured in Challans between 1940 and 2025 was 27 September 1952, with winds reaching 84.3 km/h.
What is the warmest month in Challans?
The warmest month in Challans is July (19.0 °C on average); the coldest is January (6.8 °C).
How much does it rain in Challans?
Challans receives on average 673 mm of precipitation per year, spread over about 124 rainy days.
Is it sunny in Challans?
Challans gets on average 9.1 hours of sunshine per day, roughly 3,322 hours per year over 1940-2025.
What is the biggest single-day snowfall in Challans?
The heaviest 24-hour snowfall measured in Challans between 1940 and 2025 was 26 January 1945, with 11.2 cm.
Are there tropical nights in Challans?
Yes: Challans has on average 2 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Challans?
In Challans, between 1940 and 2025, the highest apparent temperature reached 38.8 °C on 27 June 2019, and the lowest was -18.5 °C on 13 January 1987.
Compare Challans with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Challans