Château-d'Olonne climate — normals and trends
Château-d'Olonne (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 12.9 °C and it receives 779 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 August (19.0 °C on average) and the coldest is January (7.3 °C). Rainfall peaks in November.
Château-d'Olonne averages 7 frost days, 0 hot days (≥ 30 °C) and 127 rainy days per year.
Château-d'Olonne has warmed by +1.3 °C between 1940 and 2025, or +0.16 °C per decade. This trend is statistically significant.
The number of frost days there went from about 12 to 2 per year over the period.
The hottest day of the period reached 33.7 °C (on 17 June 2022) and the coldest -8.2 °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
Château-d'OlonnePays de la Loire Region
- coords
- 46.50°, -1.74°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
12.9°C
Average daily high
14.9°C
Average daily low
11.0°C
Annual rainfall
779mm
Sunshine / day
9.3h
Mean relative humidity
79%
Average peak wind
25.9km/h
Seasonal range
11.7°C
Frost days (< 0 °C)
7 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
127 d/yr
Annual snowfall
1.6 cm
Average feels-like high
12.8 °C
Average feels-like low
7.9 °C
Average peak gust
38.6 km/h
Tropical nights (≥ 20 °C)
4 d/yr
Solar radiation
13.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.3 °C
since 1940
+0.2 °C per decade · r² = 0.34 · 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
33.7 °C
17 June 2022
Coldest day
-8.2 °C
12 January 1987
Wettest day
50 mm
28 September 1991
Windiest day
88.7 km/h
27 December 1999
Strongest gust
142.6 km/h
27 December 1999
Hottest feels-like
35.3 °C
10 August 2003
Coldest feels-like
-16.9 °C
12 January 1987
Snowiest day
10.9 cm
26 January 1945
Sunniest day
15.4 h
22 June 2018
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 | 9.9 °C | +1.0 °C | 192 mm | +104 mm |
| Feb | 10.0 °C | +0.8 °C | 63 mm | -6 mm |
| Mar | 12.4 °C | +1.3 °C | 27 mm | -33 mm |
| Apr | 15.8 °C | +2.6 °C | 86 mm | +35 mm |
| May | 17.9 °C | +1.7 °C | 29 mm | -27 mm |
| Jun | 22.4 °C | +3.2 °C | 26 mm | -14 mm |
| Jul | 22.2 °C | +1.2 °C | 53 mm | +19 mm |
| Aug | 23.3 °C | +2.2 °C | 18 mm | -22 mm |
| Sep | 19.4 °C | -0.2 °C | 61 mm | +7 mm |
| Oct | 17.6 °C | +1.1 °C | 76 mm | -9 mm |
| Nov | 14.3 °C | +1.9 °C | 90 mm | -12 mm |
| Dec | 11.2 °C | +1.3 °C | 100 mm | +1 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 Château-d'Olonne?
Château-d'Olonne has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 12.9 °C and it receives 779 mm of precipitation per year.
What is the hottest day ever recorded in Château-d'Olonne?
The hottest day measured in Château-d'Olonne between 1940 and 2025 was 17 June 2022, reaching 33.7 °C.
What is the coldest day in Château-d'Olonne?
The coldest day measured in Château-d'Olonne between 1940 and 2025 was 12 January 1987, at -8.2 °C.
Does it snow in Château-d'Olonne?
Yes. Château-d'Olonne gets on average 1.6 cm of snow per year and has around 7 frost days.
Has the climate of Château-d'Olonne warmed?
Yes: Château-d'Olonne warmed by +1.3 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Château-d'Olonne?
The wettest day measured in Château-d'Olonne between 1940 and 2025 was 28 September 1991, with 50 mm of rain in 24 hours.
What was the windiest day in Château-d'Olonne?
The windiest day measured in Château-d'Olonne between 1940 and 2025 was 27 December 1999, with winds reaching 88.7 km/h.
What is the warmest month in Château-d'Olonne?
The warmest month in Château-d'Olonne is August (19.0 °C on average); the coldest is January (7.3 °C).
How much does it rain in Château-d'Olonne?
Château-d'Olonne receives on average 779 mm of precipitation per year, spread over about 127 rainy days.
Is it sunny in Château-d'Olonne?
Château-d'Olonne gets on average 9.3 hours of sunshine per day, roughly 3,395 hours per year over 1940-2025.
What is the biggest single-day snowfall in Château-d'Olonne?
The heaviest 24-hour snowfall measured in Château-d'Olonne between 1940 and 2025 was 26 January 1945, with 10.9 cm.
Are there tropical nights in Château-d'Olonne?
Yes: Château-d'Olonne has on average 4 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Château-d'Olonne?
In Château-d'Olonne, between 1940 and 2025, the highest apparent temperature reached 35.3 °C on 10 August 2003, and the lowest was -16.9 °C on 12 January 1987.
Compare Château-d'Olonne with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Château-d'Olonne