Hardly any mainland French towns wake to more frost than Crolles
July afternoons average 28.5°C. It is a wet place: more rain falls here than on 95% of mainland French towns. The year swings widely: the coldest month’s nights and the warmest month’s afternoons are 30°C apart. Homes need heating from November to March, the months averaging under 10°C.
These are the figures of Météo-France’s Pont-de-Beauvoisin station, 32 km north-west; at that distance they describe the area more than the town.
A year in Crolles at a glance
Each month’s typical high and low in °C, at the Pont-de-Beauvoisin station.
What a year in Crolles feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Pont-de-Beauvoisin.
About 1,166 mm of rain a year
October is the wettest month and February the driest. About 39 days a year bring 10 mm or more. 8th wettest of 110 towns of 2,500+ in Isère.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Chambery-Aix
A frosty town: 83 frosts and 92 days of 25°C a year
On about 83 nights a year the air drops to 0°C or below, and on about 7 days it stays below freezing all day. About 92 days a year reach 25°C, and 36 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Pont-de-Beauvoisin: 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 Pont-de-Beauvoisin
Pont-de-Beauvoisin is 32 km north-west of Crolles. Every figure on this page is the station’s, not a measurement in Crolles itself.
| Station (Météo-France number) | Pont-de-Beauvoisin (38315002) |
| Distance from the town | 32 km north-west |
| Station altitude | 284 m |
| Town altitude (its center) | 254 m |
| Period | 1991–2020 |
| Nearest station of any kind | 7.2 km |
| Sunshine measured at | Chambery-Aix, 40 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 Crolles 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 Isère.
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 |
|---|---|---|---|---|
| Crolles | Pont-de-Beauvoisin | 28.5°C | −1.2°C | 1,166 mm |
| Bernin 2 km | same station | 28.5°C about the same | −1.2°C about the same | 1,166 mm |
| Froges 3.5 km | Saint-Pierre-de-Soucy | 27.7°C 0.8°C cooler | −1.8°C 0.6°C colder | 1,122 mm |
| Saint-Nazaire-les-Eymes 4 km | Saint-Pierre-de-Soucy | 27.7°C 0.8°C cooler | −1.8°C 0.6°C colder | 1,122 mm |
| Villard-Bonnot 4.3 km | same station | 28.5°C about the same | −1.2°C about the same | 1,166 mm |
| Saint-Ismier 5.4 km | Saint-Pierre-de-Soucy | 27.7°C 0.8°C cooler | −1.8°C 0.6°C colder | 1,122 mm |
| Le Versoud 7.2 km | same station | 28.5°C about the same | −1.2°C about the same | 1,166 mm |
Crolles weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Pont-de-Beauvoisin station; sunshine at Chambery-Aix.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.8°C | −1.2°C | 2.8°C | 84 mm | 77 |
| February | 9.1°C | −1.2°C | 3.9°C | 69 mm | 102 |
| March | 14.3°C | 1.6°C | 7.9°C | 84 mm | 158 |
| April | 17.9°C | 4.5°C | 11.2°C | 93 mm | 176 |
| May | 21.9°C | 8.9°C | 15.4°C | 115 mm | 202 |
| June | 26.0°C | 12.4°C | 19.2°C | 103 mm | 236 |
| July | 28.5°C | 13.9°C | 21.2°C | 94 mm | 262 |
| August | 28.2°C | 13.7°C | 20.9°C | 89 mm | 237 |
| September | 23.2°C | 10.2°C | 16.7°C | 111 mm | 181 |
| October | 17.9°C | 7.1°C | 12.5°C | 117 mm | 124 |
| November | 11.2°C | 2.5°C | 6.9°C | 113 mm | 75 |
| December | 7.2°C | −0.4°C | 3.4°C | 94 mm | 66 |
| Year | 17.7°C | 6.0°C | 11.8°C | 1,166 mm | 1,895 |
Where Crolles’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Pont-de-Beauvoisin, 32 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, Chambery-Aix, 40 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 Isère.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Crolles’s climate
How warm does Crolles get in summer?
July is the warmest month, with average highs of 28.5°C. About 92 days a year reach 25°C, more than 83% of mainland French towns, and about 36 reach 30°C.
How cold does Crolles get in winter?
January nights average −1.2°C. The air drops to 0°C or below on about 83 nights a year, and about 7 days a year stay below freezing all day.
How much rain does Crolles get?
About 1,166 mm a year, more than 95% of mainland French towns. October is the wettest month (117 mm) and February the driest (69 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Chambery-Aix (40 km away), averages 1,895 hours of sunshine a year.
Are these figures for Crolles itself?
No: they are the normals of the Météo-France station matched to Crolles, Pont-de-Beauvoisin, 32 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 PONT-DE-BEAUVOISIN, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Crolles →
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.