Chalon gets more frosts than 86% of mainland French towns
Météo-France’s Mornant station, 27 km north-west: January nights average 0.0°C, July afternoons 28.1°C, and a year brings 759 mm of rain. Summers, though, are warm: afternoons in July are warmer than in 79% of mainland French towns. The seasons are far apart: from a winter night to a summer afternoon the average spans 28°C. Its January nights are the coldest among its 6 nearest neighbors. At that distance, read them as the area’s climate.
A year in Chalon at a glance
Each month’s typical high and low in °C, at the Mornant station.
What a year in Chalon feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Mornant.
About 759 mm of rain a year
October is the wettest month and February the driest. About 22 days a year bring 10 mm or more. 110th wettest of 110 towns of 2,500+ in Isère.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Lyon-Bron
A frosty town: 65 frosts and 87 days of 25°C a year
On about 65 nights a year the air drops to 0°C or below, and on about 6 days it stays below freezing all day. About 87 days a year reach 25°C, and 33 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Mornant: 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 Mornant
Mornant is 27 km north-west of Chalon. Every figure on this page is the station’s, not a measurement in Chalon itself.
| Station (Météo-France number) | Mornant (69141001) |
| Distance from the town | 27 km north-west |
| Station altitude | 343 m |
| Town altitude (its center) | 365 m |
| Period | 1991–2020 |
| Nearest station of any kind | 10 km |
| Sunshine measured at | Lyon-Bron, 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 Chalon 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, each with its own matched station.
| Town | Station | July high | January low | Rain a year |
|---|---|---|---|---|
| Chalon | Mornant | 28.1°C | 0.0°C | 759 mm |
| Estrablin 7.1 km | Lyon-Bron | 28.2°C about the same | 1.1°C 1.1°C milder | 821 mm |
| Pont-Évêque 9 km | Lyon-Bron | 28.2°C about the same | 1.1°C 1.1°C milder | 821 mm |
| Vienne 9.3 km | Lyon-Bron | 28.2°C about the same | 1.1°C 1.1°C milder | 821 mm |
| Ampuis 10 km | Sablons | 30.2°C 2.1°C warmer | 0.7°C 0.7°C milder | 805 mm |
| Saint-Clair-du-Rhône 12 km | Sablons | 30.2°C 2.1°C warmer | 0.7°C 0.7°C milder | 805 mm |
| Roussillon 13 km | Sablons | 30.2°C 2.1°C warmer | 0.7°C 0.7°C milder | 805 mm |
Chalon weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Mornant station; sunshine at Lyon-Bron.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 7.0°C | 0.0°C | 3.5°C | 48 mm | 71 |
| February | 8.9°C | 0.2°C | 4.5°C | 35 mm | 102 |
| March | 13.8°C | 2.7°C | 8.2°C | 43 mm | 174 |
| April | 17.3°C | 5.3°C | 11.3°C | 60 mm | 198 |
| May | 21.3°C | 9.2°C | 15.2°C | 71 mm | 224 |
| June | 25.5°C | 12.8°C | 19.2°C | 70 mm | 257 |
| July | 28.1°C | 14.7°C | 21.4°C | 69 mm | 288 |
| August | 27.9°C | 14.4°C | 21.1°C | 62 mm | 263 |
| September | 23.0°C | 10.7°C | 16.8°C | 77 mm | 204 |
| October | 17.5°C | 7.7°C | 12.6°C | 87 mm | 131 |
| November | 11.2°C | 3.4°C | 7.3°C | 86 mm | 79 |
| December | 7.6°C | 0.7°C | 4.2°C | 50 mm | 59 |
| Year | 17.4°C | 6.8°C | 12.1°C | 759 mm | 2,050 |
Where Chalon’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Mornant, 27 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, Lyon-Bron, 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 Chalon’s climate
How warm does Chalon get in summer?
July is the warmest month, with average highs of 28.1°C. About 87 days a year reach 25°C, more than 77% of mainland French towns, and about 33 reach 30°C.
How cold does Chalon get in winter?
January nights average 0.0°C. The air drops to 0°C or below on about 65 nights a year, and about 6 days a year stay below freezing all day.
How much rain does Chalon get?
About 759 mm a year, more than 51% of mainland French towns. October is the wettest month (87 mm) and February the driest (35 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Lyon-Bron (30 km away), averages 2,050 hours of sunshine a year.
Are these figures for Chalon itself?
No: they are the normals of the Météo-France station matched to Chalon, Mornant, 27 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 MORNANT, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Chalon →
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.