Optevoz sits near the top of mainland French towns for rain, with 1,512 mm a year
January mornings start at about −0.7°C. The rainiest month is November; the driest is August. Frosty nights outnumber those of 93% of mainland French towns. If you like long walks, May, June and September offer highs of 22–25°C.
Figures from Météo-France’s Saint-Rambert-en-Bugey station, 21 km north.
A year in Optevoz at a glance
Each month’s typical high and low in °C, at the Saint-Rambert-en-Bugey station.
What a year in Optevoz feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Saint-Rambert-en-Bugey.
About 1,512 mm of rain a year
November is the wettest month and August the driest. About 52 days a year bring 10 mm or more. The wettest of 110 towns of 2,500+ in Isère.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Lyon-Saint-Exupery
A frosty town: 76 frosts and 81 days of 25°C a year
On about 76 nights a year the air drops to 0°C or below, and on about 7 days it stays below freezing all day. About 81 days a year reach 25°C, and 28 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Saint-Rambert-en-Bugey: 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-Rambert-en-Bugey
Saint-Rambert-en-Bugey is 21 km north of Optevoz. Every figure on this page is the station’s, not a measurement in Optevoz itself.
| Station (Météo-France number) | Saint-Rambert-en-Bugey (01384001) |
| Distance from the town | 21 km north |
| Station altitude | 287 m |
| Town altitude (its center) | 288 m |
| Period | 1991–2020 |
| Nearest station of any kind | 12 km |
| Sunshine measured at | Lyon-Saint-Exupery, 20 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 Optevoz 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 |
|---|---|---|---|---|
| Optevoz | Saint-Rambert-en-Bugey | 27.6°C | −0.7°C | 1,512 mm |
| Crémieu 7.3 km | Lyon-Saint-Exupery | 27.5°C about the same | 1.1°C 1.8°C milder | 863 mm |
| Montalieu-Vercieu 8.6 km | same station | 27.6°C about the same | −0.7°C about the same | 1,512 mm |
| Saint-Romain-de-Jalionas 9 km | Lyon-Saint-Exupery | 27.5°C about the same | 1.1°C 1.8°C milder | 863 mm |
| Loyettes 10 km | Lyon-Saint-Exupery | 27.5°C about the same | 1.1°C 1.8°C milder | 863 mm |
| Tignieu-Jameyzieu 12 km | Lyon-Saint-Exupery | 27.5°C about the same | 1.1°C 1.8°C milder | 863 mm |
| Chavanoz 12 km | Lyon-Saint-Exupery | 27.5°C about the same | 1.1°C 1.8°C milder | 863 mm |
Optevoz weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Saint-Rambert-en-Bugey station; sunshine at Lyon-Saint-Exupery.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.0°C | −0.7°C | 2.6°C | 134 mm | 73 |
| February | 8.2°C | −0.7°C | 3.8°C | 114 mm | 99 |
| March | 13.5°C | 1.6°C | 7.5°C | 112 mm | 168 |
| April | 17.4°C | 4.6°C | 11.0°C | 123 mm | 183 |
| May | 21.5°C | 8.4°C | 14.9°C | 135 mm | 217 |
| June | 25.3°C | 11.5°C | 18.4°C | 105 mm | 252 |
| July | 27.6°C | 13.2°C | 20.4°C | 108 mm | 279 |
| August | 27.2°C | 12.9°C | 20.1°C | 99 mm | 247 |
| September | 22.4°C | 9.8°C | 16.1°C | 128 mm | 186 |
| October | 17.1°C | 7.1°C | 12.1°C | 151 mm | 124 |
| November | 10.4°C | 2.9°C | 6.7°C | 159 mm | 72 |
| December | 6.2°C | 0.2°C | 3.2°C | 145 mm | 50 |
| Year | 16.9°C | 5.9°C | 11.4°C | 1,512 mm | 1,947 |
Where Optevoz’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Saint-Rambert-en-Bugey, 21 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-Saint-Exupery, 20 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 Optevoz’s climate
How warm does Optevoz get in summer?
July is the warmest month, with average highs of 27.6°C. About 81 days a year reach 25°C, more than 72% of mainland French towns, and about 28 reach 30°C.
How cold does Optevoz get in winter?
January nights average −0.7°C. The air drops to 0°C or below on about 76 nights a year, and about 7 days a year stay below freezing all day.
How much rain does Optevoz get?
About 1,512 mm a year, more than almost every mainland French town. November is the wettest month (159 mm) and August the driest (99 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Lyon-Saint-Exupery (20 km away), averages 1,947 hours of sunshine a year.
Are these figures for Optevoz itself?
No: they are the normals of the Météo-France station matched to Optevoz, Saint-Rambert-en-Bugey, 21 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 SAINT RAMBERT EN BUGEY, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Optevoz →
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.