Summer arrives in force in Châteauneuf-sur-Isère, hotter than in 89% of mainland French towns
In January the night’s low is typically 0.8°C. Winter nights are cold: in January they are colder than in 77% of mainland French towns. Seasons differ by 29°C, from the coldest nights to the warmest afternoons. The outdoor season, with highs of 19–27°C, runs through May, June, September and October.
These are the figures of Météo-France’s Romans station, 5.6 km north-east.
A year in Châteauneuf-sur-Isère at a glance
Each month’s typical high and low in °C, at the Romans station.
What a year in Châteauneuf-sur-Isère feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Romans.
About 877 mm of rain a year
October is the wettest month and February the driest. About 26 days a year bring 10 mm or more. 16th wettest of 40 towns of 2,500+ in Drôme.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Colombier Jeune Rad
49 frosts and 98 days of 25°C a year
On about 49 nights a year the air drops to 0°C or below, and on about 3 days it stays below freezing all day. About 98 days a year reach 25°C, and 40 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Romans: 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 Romans
Romans is 5.6 km north-east of Châteauneuf-sur-Isère. Every figure on this page is the station’s, not a measurement in Châteauneuf-sur-Isère itself.
| Station (Météo-France number) | Romans (26281001) |
| Distance from the town | 5.6 km north-east |
| Station altitude | 156 m |
| Town altitude (its center) | 207 m |
| Period | 1991–2020 |
| Sunshine measured at | Colombier Jeune Rad, 22 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 Châteauneuf-sur-Isère 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 Drôme.
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 |
|---|---|---|---|---|
| Châteauneuf-sur-Isère | Romans | 29.3°C | 0.8°C | 877 mm |
| Saint-Marcel-lès-Valence 4.8 km | Valence-Chabeui | 29.4°C about the same | 1.0°C about the same | 874 mm |
| Alixan 6.1 km | Valence-Chabeui | 29.4°C about the same | 1.0°C about the same | 874 mm |
| Pont-de-l'Isère 6.4 km | Mercurol | 29.6°C about the same | 1.4°C 0.6°C milder | 864 mm |
| La Roche-de-Glun 7.8 km | Mercurol | 29.6°C about the same | 1.4°C 0.6°C milder | 864 mm |
| Bourg-lès-Valence 7.9 km | Valence-Chabeui | 29.4°C about the same | 1.0°C about the same | 874 mm |
| Mercurol-Veaunes 8.2 km | Mercurol | 29.6°C about the same | 1.4°C 0.6°C milder | 864 mm |
Châteauneuf-sur-Isère weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Romans station; sunshine at Colombier Jeune Rad.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.1°C | 0.8°C | 4.4°C | 52 mm | 73 |
| February | 9.9°C | 0.9°C | 5.4°C | 42 mm | 99 |
| March | 14.7°C | 3.5°C | 9.1°C | 52 mm | 168 |
| April | 18.2°C | 6.2°C | 12.2°C | 73 mm | 188 |
| May | 22.4°C | 10.3°C | 16.3°C | 84 mm | 218 |
| June | 26.6°C | 13.7°C | 20.2°C | 66 mm | 261 |
| July | 29.3°C | 15.4°C | 22.3°C | 59 mm | 282 |
| August | 29.0°C | 15.1°C | 22.1°C | 69 mm | 253 |
| September | 24.0°C | 11.7°C | 17.9°C | 104 mm | 197 |
| October | 18.7°C | 8.8°C | 13.7°C | 116 mm | 123 |
| November | 12.4°C | 4.4°C | 8.4°C | 106 mm | 81 |
| December | 8.4°C | 1.5°C | 5.0°C | 54 mm | 62 |
| Year | 18.5°C | 7.7°C | 13.1°C | 877 mm | 2,003 |
Where Châteauneuf-sur-Isère’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Romans, 5.6 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, Colombier Jeune Rad, 22 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 Drôme.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Châteauneuf-sur-Isère’s climate
How warm does Châteauneuf-sur-Isère get in summer?
July is the warmest month, with average highs of 29.3°C. About 98 days a year reach 25°C, more than 87% of mainland French towns, and about 40 reach 30°C.
How cold does Châteauneuf-sur-Isère get in winter?
January nights average 0.8°C. The air drops to 0°C or below on about 49 nights a year, and about 3 days a year stay below freezing all day.
How much rain does Châteauneuf-sur-Isère get?
About 877 mm a year, more than 74% of mainland French towns. October is the wettest month (116 mm) and February the driest (42 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Colombier Jeune Rad (22 km away), averages 2,003 hours of sunshine a year.
Are these figures for Châteauneuf-sur-Isère itself?
No: they are the normals of the Météo-France station matched to Châteauneuf-sur-Isère, Romans, 5.6 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 ROMANS_SAPC, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Châteauneuf-sur-Isère →
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.