Summer afternoons in Larnas are warmer than in 92% of mainland French towns
Nights in January average 1.2°C. By rainfall alone, it ranks wetter than 89% of mainland French towns. Seasons differ by 29°C, from the coldest nights to the warmest afternoons. Plan time outside for May, September and October, when highs sit at 19–25°C.
These are the figures of Météo-France’s Alba-la-Romaine station, 10 km north.
A year in Larnas at a glance
Each month’s typical high and low in °C, at the Alba-la-Romaine station.
What a year in Larnas feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Alba-la-Romaine.
About 1,044 mm of rain a year
November is the wettest month and February the driest. About 29 days a year bring 10 mm or more. 8th wettest of 22 towns of 2,500+ in Ardèche.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Montélimar
43 frosts and 104 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 104 days a year reach 25°C, and 47 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Alba-la-Romaine: 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 Alba-la-Romaine
Alba-la-Romaine is 10 km north of Larnas. Every figure on this page is the station’s, not a measurement in Larnas itself.
| Station (Météo-France number) | Alba-la-Romaine (07005001) |
| Distance from the town | 10 km north |
| Station altitude | 223 m |
| Town altitude (its center) | 303 m |
| Period | 1991–2020 |
| Sunshine measured at | Montélimar, 19 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 Larnas 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 Ardèche.
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 |
|---|---|---|---|---|
| Larnas | Alba-la-Romaine | 30.1°C | 1.2°C | 1,044 mm |
| Viviers 8 km | Donzère | 30.9°C 0.8°C warmer | 2.4°C 1.2°C milder | 826 mm |
| Bourg-Saint-Andéol 9.2 km | Pierrelatte | 30.3°C about the same | 2.3°C 1.1°C milder | 795 mm |
| Donzère 9.7 km | Donzère | 30.9°C 0.8°C warmer | 2.4°C 1.2°C milder | 826 mm |
| Châteauneuf-du-Rhône 12 km | Donzère | 30.9°C 0.8°C warmer | 2.4°C 1.2°C milder | 826 mm |
| Pierrelatte 12 km | Pierrelatte | 30.3°C about the same | 2.3°C 1.1°C milder | 795 mm |
| Le Teil 13 km | Montélimar | 29.8°C about the same | 2.6°C 1.4°C milder | 920 mm |
Larnas weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Alba-la-Romaine station; sunshine at Montélimar.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 9.0°C | 1.2°C | 5.1°C | 83 mm | 107 |
| February | 10.7°C | 1.3°C | 6.0°C | 50 mm | 136 |
| March | 15.3°C | 4.0°C | 9.6°C | 60 mm | 200 |
| April | 18.6°C | 6.6°C | 12.6°C | 82 mm | 219 |
| May | 22.9°C | 10.4°C | 16.6°C | 92 mm | 260 |
| June | 27.2°C | 14.1°C | 20.7°C | 58 mm | 300 |
| July | 30.1°C | 16.3°C | 23.2°C | 56 mm | 330 |
| August | 29.8°C | 15.9°C | 22.9°C | 60 mm | 299 |
| September | 24.5°C | 12.5°C | 18.5°C | 130 mm | 231 |
| October | 18.8°C | 9.2°C | 14.0°C | 146 mm | 156 |
| November | 12.7°C | 4.8°C | 8.8°C | 152 mm | 110 |
| December | 9.3°C | 1.9°C | 5.6°C | 76 mm | 95 |
| Year | 19.1°C | 8.2°C | 13.6°C | 1,044 mm | 2,441 |
Where Larnas’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Alba-la-Romaine, 10 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, 19 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 Ardèche.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Larnas’s climate
How warm does Larnas get in summer?
July is the warmest month, with average highs of 30.1°C. About 104 days a year reach 25°C, more than 90% of mainland French towns, and about 47 reach 30°C.
How cold does Larnas 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 Larnas get?
About 1,044 mm a year, more than 89% of mainland French towns. November is the wettest month (152 mm) and February the driest (50 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Montélimar (19 km away), averages 2,441 hours of sunshine a year.
Are these figures for Larnas itself?
No: they are the normals of the Météo-France station matched to Larnas, Alba-la-Romaine, 10 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 ALBA LA ROMAINE, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Larnas →
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.