Rontalon has colder winter nights than 80% of mainland French towns
On a normal July day the thermometer tops out near 25.5°C. It is a wet place: more rain falls here than on 71% of mainland French towns. November is the wettest month, February the driest. The outdoor season runs from May to September, with highs of 19–26°C.
Figures from Météo-France’s Saint-Didier-River station, 7.7 km south.
A year in Rontalon at a glance
Each month’s typical high and low in °C, at the Saint-Didier-River station.
What a year in Rontalon feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Saint-Didier-River.
About 856 mm of rain a year
November is the wettest month and February the driest. About 25 days a year bring 10 mm or more. 13th wettest of 118 towns of 2,500+ in Rhône.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Lyon-Bron
A frosty town: 50 frosts and 53 days of 25°C a year
On about 50 nights a year the air drops to 0°C or below, and on about 9 days it stays below freezing all day. About 53 days a year reach 25°C, and 11 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Saint-Didier-River: 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 Saint-Didier-River
Saint-Didier-River is 7.7 km south of Rontalon. Every figure on this page is the station’s, not a measurement in Rontalon itself.
| Station (Météo-France number) | Saint-Didier-River (69195002) |
| Distance from the town | 7.7 km south |
| Station altitude | 600 m |
| Town altitude (its center) | 539 m |
| Period | 1991–2020 |
| Nearest station of any kind | 6.4 km |
| Sunshine measured at | Lyon-Bron, 26 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 Rontalon 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 Rhône.
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 |
|---|---|---|---|---|
| Rontalon | Saint-Didier-River | 25.5°C | 0.5°C | 856 mm |
| Thurins 2.7 km | Mornant | 28.1°C 2.6°C warmer | 0.0°C 0.5°C colder | 759 mm |
| Saint-Martin-en-Haut 5 km | Saint-Symphorien-C | 25.8°C about the same | −1.1°C 1.6°C colder | 861 mm |
| Messimy 5.8 km | Mornant | 28.1°C 2.6°C warmer | 0.0°C 0.5°C colder | 759 mm |
| Soucieu-en-Jarrest 6 km | Mornant | 28.1°C 2.6°C warmer | 0.0°C 0.5°C colder | 759 mm |
| Mornant 6 km | Mornant | 28.1°C 2.6°C warmer | 0.0°C 0.5°C colder | 759 mm |
| Orliénas 7.6 km | Saint-Genis-Laval | 28.2°C 2.7°C warmer | 1.0°C 0.5°C milder | 783 mm |
Rontalon weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Saint-Didier-River station; sunshine at Lyon-Bron.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.3°C | 0.5°C | 3.4°C | 56 mm | 71 |
| February | 7.5°C | 0.7°C | 4.1°C | 46 mm | 102 |
| March | 11.9°C | 3.6°C | 7.8°C | 52 mm | 174 |
| April | 15.0°C | 6.1°C | 10.5°C | 71 mm | 198 |
| May | 18.9°C | 9.9°C | 14.4°C | 83 mm | 224 |
| June | 22.9°C | 13.6°C | 18.3°C | 77 mm | 257 |
| July | 25.5°C | 15.8°C | 20.7°C | 77 mm | 288 |
| August | 25.5°C | 15.8°C | 20.6°C | 71 mm | 263 |
| September | 20.8°C | 12.0°C | 16.4°C | 84 mm | 204 |
| October | 15.7°C | 8.7°C | 12.2°C | 91 mm | 131 |
| November | 10.2°C | 4.1°C | 7.2°C | 93 mm | 79 |
| December | 7.1°C | 1.4°C | 4.2°C | 56 mm | 59 |
| Year | 15.6°C | 7.7°C | 11.6°C | 856 mm | 2,050 |
Where Rontalon’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Saint-Didier-River, 7.7 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, 26 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 Rhône.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Rontalon’s climate
How warm does Rontalon get in summer?
July is the warmest month, with average highs of 25.5°C. About 53 days a year reach 25°C, fewer than 65% of mainland French towns, and about 11 reach 30°C.
How cold does Rontalon get in winter?
January nights average 0.5°C. The air drops to 0°C or below on about 50 nights a year, and about 9 days a year stay below freezing all day.
How much rain does Rontalon get?
About 856 mm a year, more than 71% of mainland French towns. November is the wettest month (93 mm) and February the driest (46 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Lyon-Bron (26 km away), averages 2,050 hours of sunshine a year.
Are these figures for Rontalon itself?
No: they are the normals of the Météo-France station matched to Rontalon, Saint-Didier-River, 7.7 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 ST-DIDIER-RIVER, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Rontalon →
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.