Less rain falls on Guillerval than on 82% of mainland French towns: 656 mm a year
About 656 mm of rain falls in a typical year; July afternoons reach 25.9°C and January nights drop to 1.2°C. Frost is common: about 54 nights a year drop below freezing, more than in 75% of mainland French towns. Rain is spread evenly through the year: the wettest month, December, gets little more than the driest, April. Figures from Météo-France’s Sainville station, 15 km west.
A year in Guillerval at a glance
Each month’s typical high and low in °C, at the Sainville station.
What a year in Guillerval feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Sainville.
About 656 mm of rain a year
December is the wettest month and April the driest. About 17 days a year bring 10 mm or more. 35th wettest of 96 towns of 2,500+ in Essonne.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Chartres
A frosty town: 54 frosts and 57 days of 25°C a year
On about 54 nights a year the air drops to 0°C or below, and on about 4 days it stays below freezing all day. About 57 days a year reach 25°C, and 15 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Sainville: 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 Sainville
Sainville is 15 km west of Guillerval. Every figure on this page is the station’s, not a measurement in Guillerval itself.
| Station (Météo-France number) | Sainville (28363001) |
| Distance from the town | 15 km west |
| Station altitude | 149 m |
| Town altitude (its center) | 94 m |
| Period | 1991–2020 |
| Sunshine measured at | Chartres, 45 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 Guillerval 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 Essonne.
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 |
|---|---|---|---|---|
| Guillerval | Sainville | 25.9°C | 1.2°C | 656 mm |
| Le Mérévillois 5.5 km | same station | 25.9°C about the same | 1.2°C about the same | 656 mm |
| Angerville 9 km | same station | 25.9°C about the same | 1.2°C about the same | 656 mm |
| Étampes 9.2 km | Courdimanche | 26.3°C about the same | 1.4°C about the same | 595 mm |
| Morigny-Champigny 12 km | Courdimanche | 26.3°C about the same | 1.4°C about the same | 595 mm |
| Étréchy 16 km | Brétigny | 26.0°C about the same | 1.7°C 0.5°C milder | 629 mm |
| Dourdan 19 km | Dourdan | 25.7°C about the same | 1.5°C about the same | 654 mm |
Guillerval weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Sainville station; sunshine at Chartres.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 7.0°C | 1.2°C | 4.1°C | 52 mm | 64 |
| February | 8.3°C | 0.9°C | 4.6°C | 48 mm | 88 |
| March | 12.5°C | 2.8°C | 7.6°C | 48 mm | 140 |
| April | 16.1°C | 4.6°C | 10.3°C | 46 mm | 184 |
| May | 19.7°C | 8.0°C | 13.8°C | 64 mm | 209 |
| June | 23.1°C | 11.0°C | 17.1°C | 57 mm | 222 |
| July | 25.9°C | 12.9°C | 19.4°C | 53 mm | 230 |
| August | 26.0°C | 12.9°C | 19.4°C | 51 mm | 220 |
| September | 21.8°C | 9.9°C | 15.9°C | 49 mm | 181 |
| October | 16.4°C | 7.4°C | 11.9°C | 61 mm | 118 |
| November | 10.7°C | 4.0°C | 7.4°C | 60 mm | 72 |
| December | 7.4°C | 1.7°C | 4.5°C | 66 mm | 60 |
| Year | 16.2°C | 6.4°C | 11.3°C | 656 mm | 1,787 |
Where Guillerval’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Sainville, 15 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, 45 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 Essonne.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Guillerval’s climate
How warm does Guillerval get in summer?
August is the warmest month, with average highs of 26.0°C. About 57 days a year reach 25°C, fewer than 56% of mainland French towns, and about 15 reach 30°C.
How cold does Guillerval get in winter?
February nights average 0.9°C. The air drops to 0°C or below on about 54 nights a year, and about 4 days a year stay below freezing all day.
How much rain does Guillerval get?
About 656 mm a year, less than 82% of mainland French towns. December is the wettest month (66 mm) and April the driest (46 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Chartres (45 km away), averages 1,787 hours of sunshine a year.
Are these figures for Guillerval itself?
No: they are the normals of the Météo-France station matched to Guillerval, Sainville, 15 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 SAINVILLE, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Guillerval →
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.