Summer arrives in force in Allan, hotter than in 92% of mainland French towns
Midwinter brings lows of about 1.2°C. By rainfall alone, it ranks wetter than 79% of mainland French towns. The seasons are far apart: from a winter night to a summer afternoon the average spans 29°C. Keep the boiler serviced for the months from November to March, which average under 10°C.
These are the figures of Météo-France’s Montboucher-S-J station, 5.8 km north-east.
A year in Allan at a glance
Each month’s typical high and low in °C, at the Montboucher-S-J station.
What a year in Allan feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Montboucher-S-J.
About 915 mm of rain a year
November is the wettest month and February the driest. About 27 days a year bring 10 mm or more. 9th wettest of 40 towns of 2,500+ in Drôme.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Montélimar
43 frosts and 106 days of 25°C a year
On about 43 nights a year the air drops to 0°C or below, and on about 1 days it stays below freezing all day. About 106 days a year reach 25°C, and 47 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Montboucher-S-J: 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 Montboucher-S-J
Montboucher-S-J is 5.8 km north-east of Allan. Every figure on this page is the station’s, not a measurement in Allan itself.
| Station (Météo-France number) | Montboucher-S-J (26191001) |
| Distance from the town | 5.8 km north-east |
| Station altitude | 136 m |
| Town altitude (its center) | 162 m |
| Period | 1991–2020 |
| Sunshine measured at | Montélimar, 10 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 Allan 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. 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 |
|---|---|---|---|---|
| Allan | Montboucher-S-J | 30.2°C | 1.2°C | 915 mm |
| Châteauneuf-du-Rhône 5.4 km | Donzère | 30.9°C 0.7°C warmer | 2.4°C 1.2°C milder | 826 mm |
| Montboucher-sur-Jabron 6 km | same station | 30.2°C about the same | 1.2°C about the same | 915 mm |
| Montélimar 7.1 km | Montélimar | 29.8°C about the same | 2.6°C 1.4°C milder | 920 mm |
| Donzère 9.1 km | Donzère | 30.9°C 0.7°C warmer | 2.4°C 1.2°C milder | 826 mm |
| Viviers 9.2 km | Donzère | 30.9°C 0.7°C warmer | 2.4°C 1.2°C milder | 826 mm |
| Le Teil 10 km | Montélimar | 29.8°C about the same | 2.6°C 1.4°C milder | 920 mm |
Allan weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Montboucher-S-J station; sunshine at Montélimar.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.9°C | 1.2°C | 5.1°C | 70 mm | 107 |
| February | 10.7°C | 1.3°C | 6.0°C | 45 mm | 136 |
| March | 15.4°C | 3.9°C | 9.7°C | 51 mm | 200 |
| April | 18.7°C | 6.4°C | 12.5°C | 74 mm | 219 |
| May | 22.9°C | 10.2°C | 16.5°C | 75 mm | 260 |
| June | 27.4°C | 13.7°C | 20.6°C | 59 mm | 300 |
| July | 30.2°C | 15.8°C | 23.0°C | 54 mm | 330 |
| August | 29.8°C | 15.5°C | 22.7°C | 60 mm | 299 |
| September | 24.8°C | 12.3°C | 18.6°C | 109 mm | 231 |
| October | 19.3°C | 9.3°C | 14.3°C | 129 mm | 156 |
| November | 13.0°C | 4.9°C | 9.0°C | 131 mm | 110 |
| December | 9.3°C | 2.0°C | 5.7°C | 59 mm | 95 |
| Year | 19.2°C | 8.0°C | 13.6°C | 915 mm | 2,441 |
Where Allan’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Montboucher-S-J, 5.8 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, Montélimar, 10 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 Allan’s climate
How warm does Allan get in summer?
July is the warmest month, with average highs of 30.2°C. About 106 days a year reach 25°C, more than 90% of mainland French towns, and about 47 reach 30°C.
How cold does Allan get in winter?
January nights average 1.2°C. The air drops to 0°C or below on about 43 nights a year, and about 1 days a year stay below freezing all day.
How much rain does Allan get?
About 915 mm a year, more than 79% of mainland French towns. November is the wettest month (131 mm) and February the driest (45 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Montélimar (10 km away), averages 2,441 hours of sunshine a year.
Are these figures for Allan itself?
No: they are the normals of the Météo-France station matched to Allan, Montboucher-S-J, 5.8 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 MONTBOUCHER-S-J, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Allan →
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.