Lyas is among the wettest of mainland French towns: 1,204 mm of rain a year
Peak summer warmth arrives in July, with afternoons near 25.9°C. Rain peaks in October and eases off in February. By January nights alone, it runs colder than 81% of mainland French towns. The outdoor season runs from May to September, with highs of 19–26°C.
Figures from Météo-France’s Vernoux station, 17 km north.
A year in Lyas at a glance
Each month’s typical high and low in °C, at the Vernoux station.
What a year in Lyas feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Vernoux.
About 1,204 mm of rain a year
October is the wettest month and February the driest. About 34 days a year bring 10 mm or more. 3rd wettest of 22 towns of 2,500+ in Ardèche.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Montélimar
A frosty town: 60 frosts and 58 days of 25°C a year
On about 60 nights a year the air drops to 0°C or below, and on about 6 days it stays below freezing all day. About 58 days a year reach 25°C, and 12 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Vernoux: 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 Vernoux
Vernoux is 17 km north of Lyas. Every figure on this page is the station’s, not a measurement in Lyas itself.
| Station (Météo-France number) | Vernoux (07338001) |
| Distance from the town | 17 km north |
| Station altitude | 561 m |
| Town altitude (its center) | 469 m |
| Period | 1991–2020 |
| Nearest station of any kind | 7.5 km |
| Sunshine measured at | Montélimar, 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 Lyas 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 |
|---|---|---|---|---|
| Lyas | Vernoux | 25.9°C | 0.4°C | 1,204 mm |
| Privas 2.3 km | Chomérac Sa | 29.0°C 3.1°C warmer | 1.1°C 0.7°C milder | 1,105 mm |
| Chomérac 7.9 km | Chomérac Sa | 29.0°C 3.1°C warmer | 1.1°C 0.7°C milder | 1,105 mm |
| Le Pouzin 13 km | Livron | 29.6°C 3.7°C warmer | 1.4°C 1°C milder | 917 mm |
| La Voulte-sur-Rhône 17 km | Livron | 29.6°C 3.7°C warmer | 1.4°C 1°C milder | 917 mm |
| Cruas 18 km | Montélimar | 29.8°C 3.9°C warmer | 2.6°C 2.2°C milder | 920 mm |
| Loriol-sur-Drôme 18 km | Livron | 29.6°C 3.7°C warmer | 1.4°C 1°C milder | 917 mm |
Lyas weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Vernoux station; sunshine at Montélimar.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.6°C | 0.4°C | 3.5°C | 82 mm | 107 |
| February | 7.7°C | 0.4°C | 4.0°C | 55 mm | 136 |
| March | 11.7°C | 2.9°C | 7.3°C | 63 mm | 200 |
| April | 14.8°C | 5.2°C | 10.0°C | 91 mm | 219 |
| May | 18.8°C | 8.9°C | 13.8°C | 104 mm | 260 |
| June | 23.1°C | 12.3°C | 17.7°C | 73 mm | 300 |
| July | 25.9°C | 14.4°C | 20.1°C | 75 mm | 330 |
| August | 25.6°C | 14.1°C | 19.8°C | 85 mm | 299 |
| September | 20.6°C | 10.6°C | 15.6°C | 138 mm | 231 |
| October | 15.7°C | 7.9°C | 11.8°C | 186 mm | 156 |
| November | 10.2°C | 3.8°C | 7.0°C | 170 mm | 110 |
| December | 7.2°C | 1.2°C | 4.2°C | 83 mm | 95 |
| Year | 15.7°C | 6.8°C | 11.2°C | 1,204 mm | 2,441 |
Where Lyas’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Vernoux, 17 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, 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 Ardèche.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Lyas’s climate
How warm does Lyas get in summer?
July is the warmest month, with average highs of 25.9°C. About 58 days a year reach 25°C, fewer than 55% of mainland French towns, and about 12 reach 30°C.
How cold does Lyas get in winter?
January nights average 0.4°C. The air drops to 0°C or below on about 60 nights a year, and about 6 days a year stay below freezing all day.
How much rain does Lyas get?
About 1,204 mm a year, more than 96% of mainland French towns. October is the wettest month (186 mm) and February the driest (55 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Montélimar (22 km away), averages 2,441 hours of sunshine a year.
Are these figures for Lyas itself?
No: they are the normals of the Météo-France station matched to Lyas, Vernoux, 17 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 VERNOUX, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Lyas →
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.