Chartres climate — normals and trends
Chartres (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.6 °C and it receives 632 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 (18.5 °C on average) and the coldest is January (3.2 °C). Rainfall peaks in May.
Chartres averages 47 frost days, 5 hot days (≥ 30 °C) and 123 rainy days per year.
Chartres 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 60 to 34 per year over the period.
The hottest day of the period reached 40.4 °C (on 25 July 2019) and the coldest -20.7 °C (on 17 January 1985).
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
ChartresCentre-Val de Loire
- coords
- 48.45°, 1.49°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.6°C
Average daily high
14.4°C
Average daily low
6.9°C
Annual rainfall
632mm
Sunshine / day
8.0h
Mean relative humidity
80%
Average peak wind
19.9km/h
Seasonal range
15.3°C
Frost days (< 0 °C)
47 d/yr
Hot days (≥ 30 °C)
5 d/yr
Rainy days (≥ 1 mm)
123 d/yr
Annual snowfall
14.5 cm
Average feels-like high
12.0 °C
Average feels-like low
4.1 °C
Average peak gust
37.5 km/h
Tropical nights (≥ 20 °C)
1 d/yr
Solar radiation
11.7 MJ/m²
Has the climate changed?
One stripe per year, 1940 to 2025
+1.8 °C
since 1940
+0.2 °C per decade · r² = 0.40 · 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
40.4 °C
25 July 2019
Coldest day
-20.7 °C
17 January 1985
Wettest day
63 mm
9 October 2024
Windiest day
70.8 km/h
26 December 1999
Strongest gust
134.3 km/h
26 December 1999
Hottest feels-like
40.3 °C
30 July 2024
Coldest feels-like
-26.1 °C
17 January 1985
Snowiest day
18.1 cm
25 April 1941
Sunniest day
15.9 h
24 June 1943
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 | 6.3 °C | +0.7 °C | 126 mm | +75 mm |
| Feb | 7.8 °C | +0.6 °C | 56 mm | +8 mm |
| Mar | 12.9 °C | +2.3 °C | 43 mm | -7 mm |
| Apr | 17.8 °C | +4.1 °C | 30 mm | -22 mm |
| May | 20.1 °C | +2.8 °C | 49 mm | -15 mm |
| Jun | 26.3 °C | +5.5 °C | 31 mm | -22 mm |
| Jul | 25.3 °C | +2.0 °C | 61 mm | +12 mm |
| Aug | 26.1 °C | +2.9 °C | 40 mm | -9 mm |
| Sep | 19.8 °C | -0.3 °C | 56 mm | +8 mm |
| Oct | 15.9 °C | +0.6 °C | 51 mm | -6 mm |
| Nov | 11.1 °C | +1.5 °C | 48 mm | -8 mm |
| Dec | 8.6 °C | +2.1 °C | 36 mm | -18 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 Chartres?
Chartres has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.6 °C and it receives 632 mm of precipitation per year.
What is the hottest day ever recorded in Chartres?
The hottest day measured in Chartres between 1940 and 2025 was 25 July 2019, reaching 40.4 °C.
What is the coldest day in Chartres?
The coldest day measured in Chartres between 1940 and 2025 was 17 January 1985, at -20.7 °C.
Does it snow in Chartres?
Yes. Chartres gets on average 14.5 cm of snow per year and has around 47 frost days.
Has the climate of Chartres warmed?
Yes: Chartres warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Chartres?
The wettest day measured in Chartres between 1940 and 2025 was 9 October 2024, with 63 mm of rain in 24 hours.
What was the windiest day in Chartres?
The windiest day measured in Chartres between 1940 and 2025 was 26 December 1999, with winds reaching 70.8 km/h.
What is the warmest month in Chartres?
The warmest month in Chartres is July (18.5 °C on average); the coldest is January (3.2 °C).
How much does it rain in Chartres?
Chartres receives on average 632 mm of precipitation per year, spread over about 123 rainy days.
Is it sunny in Chartres?
Chartres gets on average 8.0 hours of sunshine per day, roughly 2,920 hours per year over 1940-2025.
What is the biggest single-day snowfall in Chartres?
The heaviest 24-hour snowfall measured in Chartres between 1940 and 2025 was 25 April 1941, with 18.1 cm.
Are there tropical nights in Chartres?
Yes: Chartres has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Chartres?
In Chartres, between 1940 and 2025, the highest apparent temperature reached 40.3 °C on 30 July 2024, and the lowest was -26.1 °C on 17 January 1985.
Compare Chartres with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Chartres