Ymonville is among the driest of mainland French towns: 601 mm of rain a year
January nights here settle around 1.7°C. Frost is common: about 47 nights a year drop below freezing, more than in 65% of mainland French towns. Of all months, December brings the most rain and August the least. The outdoor season runs from May to September, with highs of 20–26°C.
These are the figures of Météo-France’s Viabon station, 8.9 km south-west.
A year in Ymonville at a glance
Each month’s typical high and low in °C, at the Viabon station.
What a year in Ymonville feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Viabon.
About 601 mm of rain a year
December is the wettest month and August the driest. About 15 days a year bring 10 mm or more. 28th wettest of 33 towns of 2,500+ in Eure-et-Loir.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Chartres
47 frosts and 55 days of 25°C a year
On about 47 nights a year the air drops to 0°C or below, and on about 5 days it stays below freezing all day. About 55 days a year reach 25°C, and 16 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Viabon: 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 Viabon
Viabon is 8.9 km south-west of Ymonville. Every figure on this page is the station’s, not a measurement in Ymonville itself.
| Station (Météo-France number) | Viabon (28406001) |
| Distance from the town | 8.9 km south-west |
| Station altitude | 138 m |
| Town altitude (its center) | 141 m |
| Period | 1993–2020 (the station’s own record) |
| Sunshine measured at | Chartres, 29 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 Ymonville 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 |
|---|---|---|---|---|
| Ymonville | Viabon | 26.2°C | 1.7°C | 601 mm |
| Les Villages Vovéens 10 km | same station | 26.2°C about the same | 1.7°C about the same | 601 mm |
| Toury 15 km | Trinay | 25.7°C 0.5°C cooler | 1.5°C about the same | 645 mm |
| Angerville 19 km | Sainville | 25.9°C about the same | 1.2°C 0.5°C colder | 656 mm |
| Auneau-Bleury-Saint-Symphorien 24 km | Sainville | 25.9°C about the same | 1.2°C 0.5°C colder | 656 mm |
| Le Mérévillois 26 km | Sainville | 25.9°C about the same | 1.2°C 0.5°C colder | 656 mm |
| Le Coudray 26 km | Chartres | 25.2°C 1°C cooler | 1.8°C about the same | 606 mm |
Ymonville weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Viabon station; sunshine at Chartres.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.8°C | 1.7°C | 4.2°C | 49 mm | 64 |
| February | 8.5°C | 1.5°C | 5.0°C | 43 mm | 88 |
| March | 12.4°C | 3.0°C | 7.7°C | 44 mm | 140 |
| April | 16.0°C | 4.9°C | 10.4°C | 46 mm | 184 |
| May | 19.5°C | 8.4°C | 13.9°C | 58 mm | 209 |
| June | 23.2°C | 11.4°C | 17.3°C | 53 mm | 222 |
| July | 26.2°C | 13.2°C | 19.7°C | 49 mm | 230 |
| August | 26.0°C | 13.1°C | 19.6°C | 42 mm | 220 |
| September | 21.8°C | 10.2°C | 16.0°C | 45 mm | 181 |
| October | 16.6°C | 7.9°C | 12.2°C | 58 mm | 118 |
| November | 10.6°C | 4.3°C | 7.4°C | 56 mm | 72 |
| December | 7.3°C | 2.2°C | 4.7°C | 60 mm | 60 |
| Year | 16.2°C | 6.8°C | 11.5°C | 601 mm | 1,787 |
Where Ymonville’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Viabon, 8.9 km away: statistics for 1991–2020 (the station’s own years, 1993–2020, where its record is shorter).
- 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, 29 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 Ymonville’s climate
How warm does Ymonville get in summer?
July is the warmest month, with average highs of 26.2°C. About 55 days a year reach 25°C, fewer than 61% of mainland French towns, and about 16 reach 30°C.
How cold does Ymonville get in winter?
February nights average 1.5°C. The air drops to 0°C or below on about 47 nights a year, and about 5 days a year stay below freezing all day.
How much rain does Ymonville get?
About 601 mm a year, less than 95% of mainland French towns. December is the wettest month (60 mm) and August the driest (42 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Chartres (29 km away), averages 1,787 hours of sunshine a year.
Are these figures for Ymonville itself?
No: they are the normals of the Météo-France station matched to Ymonville, Viabon, 8.9 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 VIABON, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Ymonville →
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.