Épernon climate — normals and trends
Épernon (France) has a temperate oceanic climate (Cfb) under the Köppen-Geiger classification. Its mean annual temperature is 10.7 °C and it receives 637 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 (18.7 °C on average) and the coldest is January (3.2 °C). Rainfall peaks in May.
Épernon averages 46 frost days, 6 hot days (≥ 30 °C) and 124 rainy days per year.
Épernon 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 58 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
ÉpernonCentre-Val de Loire
- coords
- 48.61°, 1.67°
- period
- 1940–2025 · 86 yrs
Mean daily temperature
10.7°C
Average daily high
14.6°C
Average daily low
7.0°C
Annual rainfall
637mm
Sunshine / day
7.9h
Mean relative humidity
79%
Average peak wind
19.6km/h
Seasonal range
15.5°C
Frost days (< 0 °C)
46 d/yr
Hot days (≥ 30 °C)
6 d/yr
Rainy days (≥ 1 mm)
124 d/yr
Annual snowfall
14.3 cm
Average feels-like high
12.1 °C
Average feels-like low
4.2 °C
Average peak gust
37.2 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
66 mm
9 October 2024
Windiest day
70.0 km/h
26 December 1999
Strongest gust
140.0 km/h
26 December 1999
Hottest feels-like
40.5 °C
30 July 2024
Coldest feels-like
-26.3 °C
17 January 1985
Snowiest day
18.6 cm
25 April 1941
Sunniest day
15.9 h
25 June 1949
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 | 6.4 °C | +0.7 °C | 123 mm | +71 mm |
| Feb | 7.9 °C | +0.7 °C | 57 mm | +9 mm |
| Mar | 13.2 °C | +2.4 °C | 43 mm | -8 mm |
| Apr | 17.9 °C | +4.0 °C | 35 mm | -17 mm |
| May | 20.3 °C | +2.8 °C | 44 mm | -19 mm |
| Jun | 26.5 °C | +5.5 °C | 28 mm | -26 mm |
| Jul | 25.4 °C | +1.9 °C | 68 mm | +19 mm |
| Aug | 26.1 °C | +2.8 °C | 44 mm | -6 mm |
| Sep | 19.8 °C | -0.4 °C | 59 mm | +10 mm |
| Oct | 16.0 °C | +0.6 °C | 54 mm | -4 mm |
| Nov | 11.1 °C | +1.5 °C | 47 mm | -10 mm |
| Dec | 8.8 °C | +2.2 °C | 40 mm | -16 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 Épernon?
Épernon has a temperate oceanic climate (Köppen Cfb). Over 1940-2025, the average annual temperature is 10.7 °C and it receives 637 mm of precipitation per year.
What is the hottest day ever recorded in Épernon?
The hottest day measured in Épernon between 1940 and 2025 was 25 July 2019, reaching 40.4 °C.
What is the coldest day in Épernon?
The coldest day measured in Épernon between 1940 and 2025 was 17 January 1985, at -20.7 °C.
Does it snow in Épernon?
Yes. Épernon gets on average 14.3 cm of snow per year and has around 46 frost days.
Has the climate of Épernon warmed?
Yes: Épernon warmed by +1.8 °C between 1940 and 2025, a statistically significant trend.
What is the wettest day in Épernon?
The wettest day measured in Épernon between 1940 and 2025 was 9 October 2024, with 66 mm of rain in 24 hours.
What was the windiest day in Épernon?
The windiest day measured in Épernon between 1940 and 2025 was 26 December 1999, with winds reaching 70.0 km/h.
What is the warmest month in Épernon?
The warmest month in Épernon is July (18.7 °C on average); the coldest is January (3.2 °C).
How much does it rain in Épernon?
Épernon receives on average 637 mm of precipitation per year, spread over about 124 rainy days.
Is it sunny in Épernon?
Épernon gets on average 7.9 hours of sunshine per day, roughly 2,884 hours per year over 1940-2025.
What is the biggest single-day snowfall in Épernon?
The heaviest 24-hour snowfall measured in Épernon between 1940 and 2025 was 25 April 1941, with 18.6 cm.
Are there tropical nights in Épernon?
Yes: Épernon has on average 1 tropical nights per year (temperature staying above 20 °C), over 1940-2025.
What was the most extreme apparent temperature in Épernon?
In Épernon, between 1940 and 2025, the highest apparent temperature reached 40.5 °C on 30 July 2024, and the lowest was -26.3 °C on 17 January 1985.
Compare Épernon with another city
Pick a second city: its normals will be set against these, indicator by indicator.
Nearby cities
The climate around Épernon