Midwinter lows in Fontanil-Cornillon sink below those of 90% of mainland French towns
In July the day’s top temperature is typically 28.3°C. October is the wettest month, February the driest. Its yearly rainfall tops that of 86% of mainland French towns. An umbrella earns its place on about 108 days a year with 1 mm of rain or more.
These are the figures of Météo-France’s Chatte station, 31 km south-west; at that distance they describe the area more than the town.
A year in Fontanil-Cornillon at a glance
Each month’s typical high and low in °C, at the Chatte station.
What a year in Fontanil-Cornillon feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Chatte.
About 968 mm of rain a year
October is the wettest month and February the driest. About 31 days a year bring 10 mm or more. 45th wettest of 110 towns of 2,500+ in Isère.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Grenoble-Saint-Geoirs
A frosty town: 67 frosts and 85 days of 25°C a year
On about 67 nights a year the air drops to 0°C or below, and on about 5 days it stays below freezing all day. About 85 days a year reach 25°C, and 31 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Chatte: 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 Chatte
Chatte is 31 km south-west of Fontanil-Cornillon. Every figure on this page is the station’s, not a measurement in Fontanil-Cornillon itself.
| Station (Météo-France number) | Chatte (38095001) |
| Distance from the town | 31 km south-west |
| Station altitude | 272 m |
| Town altitude (its center) | 198 m |
| Period | 1991–2020 |
| Nearest station of any kind | 13 km |
| Sunshine measured at | Grenoble-Saint-Geoirs, 30 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 Fontanil-Cornillon 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 |
|---|---|---|---|---|
| Fontanil-Cornillon | Chatte | 28.3°C | −0.5°C | 968 mm |
| Saint-Égrève 2.6 km | same station | 28.3°C about the same | −0.5°C about the same | 968 mm |
| Voreppe 4.3 km | Pont-de-Beauvoisin | 28.5°C about the same | −1.2°C 0.7°C colder | 1,166 mm |
| Sassenage 4.8 km | same station | 28.3°C about the same | −0.5°C about the same | 968 mm |
| Saint-Martin-le-Vinoux 5.4 km | same station | 28.3°C about the same | −0.5°C about the same | 968 mm |
| Fontaine 6.8 km | same station | 28.3°C about the same | −0.5°C about the same | 968 mm |
| La Tronche 8.3 km | same station | 28.3°C about the same | −0.5°C about the same | 968 mm |
Fontanil-Cornillon weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Chatte station; sunshine at Grenoble-Saint-Geoirs.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 7.2°C | −0.5°C | 3.4°C | 66 mm | 91 |
| February | 9.0°C | −0.2°C | 4.4°C | 54 mm | 112 |
| March | 13.8°C | 2.4°C | 8.1°C | 64 mm | 173 |
| April | 17.3°C | 5.2°C | 11.2°C | 84 mm | 190 |
| May | 21.2°C | 9.1°C | 15.2°C | 96 mm | 221 |
| June | 25.5°C | 12.5°C | 19.0°C | 81 mm | 258 |
| July | 28.3°C | 14.3°C | 21.3°C | 68 mm | 292 |
| August | 27.9°C | 14.1°C | 21.0°C | 82 mm | 263 |
| September | 22.9°C | 10.8°C | 16.9°C | 101 mm | 199 |
| October | 17.9°C | 7.6°C | 12.8°C | 108 mm | 140 |
| November | 11.5°C | 3.1°C | 7.3°C | 99 mm | 91 |
| December | 7.5°C | 0.1°C | 3.8°C | 66 mm | 78 |
| Year | 17.5°C | 6.5°C | 12.0°C | 968 mm | 2,108 |
Where Fontanil-Cornillon’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Chatte, 31 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, Grenoble-Saint-Geoirs, 30 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 Fontanil-Cornillon’s climate
How warm does Fontanil-Cornillon get in summer?
July is the warmest month, with average highs of 28.3°C. About 85 days a year reach 25°C, more than 76% of mainland French towns, and about 31 reach 30°C.
How cold does Fontanil-Cornillon get in winter?
January nights average −0.5°C. The air drops to 0°C or below on about 67 nights a year, and about 5 days a year stay below freezing all day.
How much rain does Fontanil-Cornillon get?
About 968 mm a year, more than 86% of mainland French towns. October is the wettest month (108 mm) and February the driest (54 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Grenoble-Saint-Geoirs (30 km away), averages 2,108 hours of sunshine a year.
Are these figures for Fontanil-Cornillon itself?
No: they are the normals of the Météo-France station matched to Fontanil-Cornillon, Chatte, 31 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 CHATTE_SAPC, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Fontanil-Cornillon →
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.