Calais climate — normals and trends
Calais (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.8 °C and it receives 767 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 (17.1 °C on average) and the coldest is February (5.3 °C). Rainfall peaks in November.
Calais averages 10 frost days, 0 hot days (≥ 30 °C) and 141 rainy days per year.
Calais has warmed by +1.8 °C between 1940 and 2025, or +0.21 °C per decade. This trend is statistically significant.
The number of frost days there went from about 18 to 2 per year over the period.
The hottest day of the period reached 31.6 °C (on 25 July 2019) and the coldest -9.6 °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
CalaisHauts-de-France
- coords
- 50.95°, 1.86°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.8°C
Average daily high
12.4°C
Average daily low
9.4°C
Annual rainfall
767mm
Sunshine / day
8.4h
Mean relative humidity
81%
Average peak wind
30.7km/h
Seasonal range
11.8°C
Frost days (< 0 °C)
10 d/yr
Hot days (≥ 30 °C)
0 d/yr
Rainy days (≥ 1 mm)
141 d/yr
Annual snowfall
10.3 cm
Average feels-like high
9.2 °C
Average feels-like low
5.2 °C
Average peak gust
44.5 km/h
Tropical nights (≥ 20 °C)
0 d/yr
Solar radiation
11.5 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.46 · 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
31.6 °C
25 July 2019
Coldest day
-9.6 °C
12 January 1987
Wettest day
56 mm
21 September 1973
Windiest day
90.0 km/h
25 January 1990
Strongest gust
139.0 km/h
25 January 1990
Hottest feels-like
34.5 °C
25 July 2019
Coldest feels-like
-16.9 °C
19 January 1963
Snowiest day
11.5 cm
29 March 1952
Sunniest day
16.0 h
8 June 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 | 6.8 °C | 0.0 °C | 107 mm | +36 mm |
| Feb | 7.4 °C | +0.7 °C | 49 mm | -8 mm |
| Mar | 10.0 °C | +1.8 °C | 16 mm | -36 mm |
| Apr | 12.8 °C | +2.6 °C | 21 mm | -26 mm |
| May | 14.4 °C | +1.3 °C | 29 mm | -20 mm |
| Jun | 18.6 °C | +2.7 °C | 48 mm | +1 mm |
| Jul | 19.8 °C | +1.8 °C | 69 mm | +18 mm |
| Aug | 20.0 °C | +1.3 °C | 33 mm | -24 mm |
| Sep | 17.9 °C | +0.6 °C | 78 mm | +10 mm |
| Oct | 15.1 °C | +0.6 °C | 90 mm | +4 mm |
| Nov | 12.0 °C | +1.4 °C | 115 mm | +16 mm |
| Dec | 9.7 °C | +1.5 °C | 54 mm | -27 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 Calais?
Calais has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.8 °C and it receives 767 mm of precipitation per year.
What is the hottest day ever recorded in Calais?
The hottest day measured in Calais between 1940 and 2025 was 25 July 2019, reaching 31.6 °C.
What is the coldest day in Calais?
The coldest day measured in Calais between 1940 and 2025 was 12 January 1987, at -9.6 °C.
Does it snow in Calais?
Yes. Calais gets on average 10.3 cm of snow per year and has around 10 frost days.
Has the climate of Calais warmed?
Yes: Calais warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Calais?
The wettest day measured in Calais between 1940 and 2025 was 21 September 1973, with 56 mm of rain in 24 hours.
What was the windiest day in Calais?
The windiest day measured in Calais between 1940 and 2025 was 25 January 1990, with winds reaching 90.0 km/h.
What is the warmest month in Calais?
The warmest month in Calais is August (17.1 °C on average); the coldest is February (5.3 °C).
How much does it rain in Calais?
Calais receives on average 767 mm of precipitation per year, spread over about 141 rainy days.
Is it sunny in Calais?
Calais gets on average 8.4 hours of sunshine per day, roughly 3,066 hours per year over 1940-2025.
What is the biggest single-day snowfall in Calais?
The heaviest 24-hour snowfall measured in Calais between 1940 and 2025 was 29 March 1952, with 11.5 cm.
Are there tropical nights in Calais?
Almost never: tropical nights (temperature staying above 20 °C) are virtually non-existent in Calais.
What was the most extreme apparent temperature in Calais?
In Calais, between 1940 and 2025, the highest apparent temperature reached 34.5 °C on 25 July 2019, and the lowest was -16.9 °C on 19 January 1963.
Compare Calais with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Calais