Less rain falls on Challet than on 88% of mainland French towns: 635 mm a year
Midsummer highs settle at about 26.0°C. Frosty nights outnumber those of 69% of mainland French towns. Of all months, December brings the most rain and April the least. Comfortable outdoor weather lasts from June to September, with highs of 22–26°C.
Figures from Météo-France’s Thimert station, 9.8 km west.
A year in Challet at a glance
Each month’s typical high and low in °C, at the Thimert station.
What a year in Challet feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Thimert.
About 635 mm of rain a year
December is the wettest month and April the driest. About 17 days a year bring 10 mm or more. 7th wettest of 33 towns of 2,500+ in Eure-et-Loir.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Chartres
50 frosts and 59 days of 25°C a year
On about 50 nights a year the air drops to 0°C or below, and on about 5 days it stays below freezing all day. About 59 days a year reach 25°C, and 17 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Thimert: 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 Thimert
Thimert is 9.8 km west of Challet. Every figure on this page is the station’s, not a measurement in Challet itself.
| Station (Météo-France number) | Thimert (28386001) |
| Distance from the town | 9.8 km west |
| Station altitude | 225 m |
| Town altitude (its center) | 189 m |
| Period | 1991–2020 |
| Sunshine measured at | Chartres, 12 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 Challet 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, each with its own matched station.
| Town | Station | July high | January low | Rain a year |
|---|---|---|---|---|
| Challet | Thimert | 26.0°C | 1.7°C | 635 mm |
| Lèves 9.6 km | Chartres | 25.2°C 0.8°C cooler | 1.8°C about the same | 606 mm |
| Pierres 10 km | Houx | 25.7°C about the same | 1.2°C 0.5°C colder | 622 mm |
| Champhol 11 km | Chartres | 25.2°C 0.8°C cooler | 1.8°C about the same | 606 mm |
| Maintenon 11 km | Houx | 25.7°C about the same | 1.2°C 0.5°C colder | 622 mm |
| Mainvilliers 12 km | Chartres | 25.2°C 0.8°C cooler | 1.8°C about the same | 606 mm |
| Nogent-le-Roi 12 km | Houx | 25.7°C about the same | 1.2°C 0.5°C colder | 622 mm |
Challet weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Thimert station; sunshine at Chartres.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.7°C | 1.7°C | 4.2°C | 59 mm | 64 |
| February | 8.2°C | 1.4°C | 4.8°C | 47 mm | 88 |
| March | 12.3°C | 3.0°C | 7.7°C | 48 mm | 140 |
| April | 16.1°C | 4.5°C | 10.3°C | 45 mm | 184 |
| May | 19.7°C | 7.8°C | 13.8°C | 60 mm | 209 |
| June | 23.2°C | 10.8°C | 17.0°C | 49 mm | 222 |
| July | 26.0°C | 12.6°C | 19.3°C | 47 mm | 230 |
| August | 26.1°C | 12.8°C | 19.5°C | 46 mm | 220 |
| September | 21.8°C | 10.3°C | 16.0°C | 47 mm | 181 |
| October | 16.2°C | 8.0°C | 12.1°C | 59 mm | 118 |
| November | 10.4°C | 4.5°C | 7.5°C | 60 mm | 72 |
| December | 7.1°C | 2.1°C | 4.6°C | 70 mm | 60 |
| Year | 16.1°C | 6.6°C | 11.4°C | 635 mm | 1,787 |
Where Challet’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Thimert, 9.8 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, 12 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 Challet’s climate
How warm does Challet get in summer?
August is the warmest month, with average highs of 26.1°C. About 59 days a year reach 25°C, fewer than 52% of mainland French towns, and about 17 reach 30°C.
How cold does Challet get in winter?
February nights average 1.4°C. The air drops to 0°C or below on about 50 nights a year, and about 5 days a year stay below freezing all day.
How much rain does Challet get?
About 635 mm a year, less than 88% of mainland French towns. December is the wettest month (70 mm) and April the driest (45 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Chartres (12 km away), averages 1,787 hours of sunshine a year.
Are these figures for Challet itself?
No: they are the normals of the Météo-France station matched to Challet, Thimert, 9.8 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 THIMERT, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Challet →
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.