Less rain falls on Épernon than on 92% of mainland French towns: 622 mm a year
Sunny July days climb to about 25.7°C. Winter and summer sit 25°C apart. Frosty nights outnumber those of 86% of mainland French towns. Picnics, hikes and garden evenings come into their own from June to September, with highs of 22–26°C.
These are the figures of Météo-France’s Houx station, 6.3 km south-west.
A year in Épernon at a glance
Each month’s typical high and low in °C, at the Houx station.
What a year in Épernon feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Houx.
About 622 mm of rain a year
May is the wettest month and February the driest. About 16 days a year bring 10 mm or more. 12th wettest of 33 towns of 2,500+ in Eure-et-Loir.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Chartres
A frosty town: 65 frosts and 54 days of 25°C a year
On about 65 nights a year the air drops to 0°C or below, and on about 4 days it stays below freezing all day. About 54 days a year reach 25°C, and 15 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Houx: a frost is a night of 0°C or below, a summer day (jour d’été) 25°C or more, a hot day (forte chaleur) 30°C or more.
The Météo-France station at Houx
Houx is 6.3 km south-west of Épernon. Every figure on this page is the station’s, not a measurement in Épernon itself.
| Station (Météo-France number) | Houx (28195001) |
| Distance from the town | 6.3 km south-west |
| Station altitude | 107 m |
| Town altitude (its center) | 126 m |
| Period | 1991–2020 |
| Sunshine measured at | Chartres, 21 km away |
TownRatings matches each commune to one station with at least 24 years of temperature and rain records: the nearest, counting every 100 m of height difference as 10 km, never across the sea.
How Épernon compares
Against the 4,385 towns of 2,500 or more in mainland France, each read from its own matched station. The dots are the other towns of 2,500+ in Eure-et-Loir.
Nearby towns’ climate
The nearest towns of 2,500+ within 29 km. Where a neighbor uses the same station its figures are the same: the differences you’d feel over a few kilometers aren’t in the normals.
| Town | Station | July high | January low | Rain a year |
|---|---|---|---|---|
| Épernon | Houx | 25.7°C | 1.2°C | 622 mm |
| Hanches 2.1 km | same station | 25.7°C about the same | 1.2°C about the same | 622 mm |
| Maintenon 7.4 km | same station | 25.7°C about the same | 1.2°C about the same | 622 mm |
| Pierres 8.5 km | same station | 25.7°C about the same | 1.2°C about the same | 622 mm |
| Gallardon 9.2 km | same station | 25.7°C about the same | 1.2°C about the same | 622 mm |
| Nogent-le-Roi 12 km | same station | 25.7°C about the same | 1.2°C about the same | 622 mm |
| Rambouillet 12 km | Saint-Léger | 24.8°C 0.9°C cooler | 1.3°C about the same | 706 mm |
Épernon weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Houx station; sunshine at Chartres.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 7.2°C | 1.2°C | 4.2°C | 50 mm | 64 |
| February | 8.6°C | 0.8°C | 4.7°C | 43 mm | 88 |
| March | 12.7°C | 2.4°C | 7.5°C | 45 mm | 140 |
| April | 16.3°C | 4.0°C | 10.1°C | 46 mm | 184 |
| May | 19.7°C | 7.5°C | 13.6°C | 63 mm | 209 |
| June | 23.2°C | 10.7°C | 16.9°C | 56 mm | 222 |
| July | 25.7°C | 12.6°C | 19.1°C | 50 mm | 230 |
| August | 25.6°C | 12.3°C | 19.0°C | 47 mm | 220 |
| September | 21.5°C | 9.4°C | 15.4°C | 47 mm | 181 |
| October | 16.5°C | 7.3°C | 11.9°C | 57 mm | 118 |
| November | 10.9°C | 3.9°C | 7.4°C | 57 mm | 72 |
| December | 7.6°C | 1.6°C | 4.6°C | 62 mm | 60 |
| Year | 16.3°C | 6.1°C | 11.2°C | 622 mm | 1,787 |
Where Épernon’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Houx, 6.3 km away: statistics for 1991–2020.
- Which station: among stations with at least 24 of the 30 years of temperature and rain, the nearest to the commune’s population-weighted center, counting each 100 m of height difference as 10 km; mainland towns use mainland stations and each overseas département its own.
- Altitudes: the town’s from IGN’s RGE ALTI® at its population-weighted center; the station’s from Météo-France.
- Sunshine: the nearest station with at least 10 years of sunshine records, Chartres, 21 km away.
- Comparisons: every town of 2,500 or more in mainland France, read the same way; the dots are the towns of 2,500+ in Eure-et-Loir.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Épernon’s climate
How warm does Épernon get in summer?
July is the warmest month, with average highs of 25.7°C. About 54 days a year reach 25°C, fewer than 64% of mainland French towns, and about 15 reach 30°C.
How cold does Épernon get in winter?
February nights average 0.8°C. The air drops to 0°C or below on about 65 nights a year, and about 4 days a year stay below freezing all day.
How much rain does Épernon get?
About 622 mm a year, less than 92% of mainland French towns. May is the wettest month (63 mm) and February the driest (43 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Chartres (21 km away), averages 1,787 hours of sunshine a year.
Are these figures for Épernon itself?
No: they are the normals of the Météo-France station matched to Épernon, Houx, 6.3 km away. France publishes its climate normals by station, not by commune; a valley, a hill or the sea can make a difference over a few kilometers.
Where do these figures come from?
Météo-France’s fiches climatologiques: 30-year averages (1991–2020) for each of its long-running stations, published as open data since 2024. They are normals, not a forecast.
Source: Météo-France, fiches climatologiques, 1991–2020 statistics (station HOUX, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Épernon →
Contains public sector information under the Licence Ouverte / Open Licence 2.0 (Etalab): INSEE, DGFiP, the Interior Ministry’s statistics service (SSMSI), the Ministry of Education (DEPP), the Health Ministry’s statistics service (DREES) and the Housing Ministry (Carte des loyers). Commune boundaries: IGN Admin Express.