Less rain falls on Saint-Hilarion than on 92% of mainland French towns: 622 mm a year
July afternoons average 25.7°C. A year here swings 25°C from midwinter lows to midsummer highs. Frost is common: about 65 nights a year drop below freezing, more than in 86% of mainland French towns. Windscreens need scraping on about 65 mornings a year, the nights the air drops below 0°C.
Figures from Météo-France’s Houx station, 9.2 km south-west.
A year in Saint-Hilarion at a glance
Each month’s typical high and low in °C, at the Houx station.
What a year in Saint-Hilarion 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. 96th wettest of 95 towns of 2,500+ in Yvelines.
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 9.2 km south-west of Saint-Hilarion. Every figure on this page is the station’s, not a measurement in Saint-Hilarion itself.
| Station (Météo-France number) | Houx (28195001) |
| Distance from the town | 9.2 km south-west |
| Station altitude | 107 m |
| Town altitude (its center) | 141 m |
| Period | 1991–2020 |
| Sunshine measured at | Chartres, 24 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 Saint-Hilarion 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 Yvelines.
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 |
|---|---|---|---|---|
| Saint-Hilarion | Houx | 25.7°C | 1.2°C | 622 mm |
| Épernon 3.2 km | same station | 25.7°C about the same | 1.2°C about the same | 622 mm |
| Hanches 5.3 km | same station | 25.7°C about the same | 1.2°C about the same | 622 mm |
| Rambouillet 9.1 km | Saint-Léger | 24.8°C 0.9°C cooler | 1.3°C about the same | 706 mm |
| Gallardon 10 km | same station | 25.7°C about the same | 1.2°C about the same | 622 mm |
| Maintenon 11 km | same station | 25.7°C about the same | 1.2°C about the same | 622 mm |
| Pierres 12 km | same station | 25.7°C about the same | 1.2°C about the same | 622 mm |
Saint-Hilarion 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 Saint-Hilarion’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Houx, 9.2 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, 24 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 Yvelines.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Saint-Hilarion’s climate
How warm does Saint-Hilarion 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 Saint-Hilarion 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 Saint-Hilarion 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 (24 km away), averages 1,787 hours of sunshine a year.
Are these figures for Saint-Hilarion itself?
No: they are the normals of the Météo-France station matched to Saint-Hilarion, Houx, 9.2 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 Saint-Hilarion →
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.