Rainfall in Bonnelles trails that of 82% of mainland French towns: 654 mm a year
Nights in January average 1.5°C. Frost is common: about 51 nights a year drop below freezing, more than in 70% of mainland French towns. Seasons differ by 25°C, from the coldest nights to the warmest afternoons. The outdoor season runs from May to September, with highs of 19–26°C.
These are the figures of Météo-France’s Dourdan station, 11 km south.
A year in Bonnelles at a glance
Each month’s typical high and low in °C, at the Dourdan station.
What a year in Bonnelles feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Dourdan.
About 654 mm of rain a year
May is the wettest month and April the driest. About 17 days a year bring 10 mm or more. 69th wettest of 95 towns of 2,500+ in Yvelines.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Trappes
A frosty town: 51 frosts and 53 days of 25°C a year
On about 51 nights a year the air drops to 0°C or below, and on about 4 days it stays below freezing all day. About 53 days a year reach 25°C, and 14 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Dourdan: 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 Dourdan
Dourdan is 11 km south of Bonnelles. Every figure on this page is the station’s, not a measurement in Bonnelles itself.
| Station (Météo-France number) | Dourdan (91200002) |
| Distance from the town | 11 km south |
| Station altitude | 116 m |
| Town altitude (its center) | 125 m |
| Period | 1991–2020 |
| Nearest station of any kind | 7.4 km |
| Sunshine measured at | Trappes, 17 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 Bonnelles 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 |
|---|---|---|---|---|
| Bonnelles | Dourdan | 25.7°C | 1.5°C | 654 mm |
| Limours 4.4 km | Gometz-le-Chat. | 25.2°C 0.5°C cooler | 1.5°C about the same | 735 mm |
| Forges-les-Bains 4.4 km | Fontenay-lès-B. | 26.1°C about the same | 1.5°C about the same | 696 mm |
| Briis-sous-Forges 7.4 km | Fontenay-lès-B. | 26.1°C about the same | 1.5°C about the same | 696 mm |
| Saint-Arnoult-en-Yvelines 8.5 km | same station | 25.7°C about the same | 1.5°C about the same | 654 mm |
| Chevreuse 9.9 km | Choisel | 25.1°C 0.6°C cooler | 1.3°C about the same | 709 mm |
| Dourdan 10 km | same station | 25.7°C about the same | 1.5°C about the same | 654 mm |
Bonnelles weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Dourdan station; sunshine at Trappes.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.9°C | 1.5°C | 4.2°C | 52 mm | 57 |
| February | 8.2°C | 1.2°C | 4.7°C | 48 mm | 81 |
| March | 12.4°C | 3.1°C | 7.8°C | 50 mm | 134 |
| April | 16.0°C | 4.9°C | 10.5°C | 44 mm | 176 |
| May | 19.4°C | 8.3°C | 13.9°C | 69 mm | 202 |
| June | 23.0°C | 11.4°C | 17.2°C | 54 mm | 210 |
| July | 25.7°C | 13.3°C | 19.5°C | 52 mm | 222 |
| August | 25.6°C | 13.1°C | 19.3°C | 57 mm | 216 |
| September | 21.5°C | 10.1°C | 15.9°C | 48 mm | 177 |
| October | 16.4°C | 7.7°C | 12.0°C | 55 mm | 117 |
| November | 10.8°C | 4.4°C | 7.6°C | 61 mm | 68 |
| December | 7.4°C | 2.0°C | 4.7°C | 66 mm | 55 |
| Year | 16.1°C | 6.8°C | 11.4°C | 654 mm | 1,714 |
Where Bonnelles’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Dourdan, 11 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, Trappes, 17 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 Bonnelles’s climate
How warm does Bonnelles get in summer?
July is the warmest month, with average highs of 25.7°C. About 53 days a year reach 25°C, fewer than 64% of mainland French towns, and about 14 reach 30°C.
How cold does Bonnelles get in winter?
February nights average 1.2°C. The air drops to 0°C or below on about 51 nights a year, and about 4 days a year stay below freezing all day.
How much rain does Bonnelles get?
About 654 mm a year, less than 82% of mainland French towns. May is the wettest month (69 mm) and April the driest (44 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Trappes (17 km away), averages 1,714 hours of sunshine a year.
Are these figures for Bonnelles itself?
No: they are the normals of the Météo-France station matched to Bonnelles, Dourdan, 11 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 DOURDAN, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Bonnelles →
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.