Ice on the ground: Jas sees more frosts than 87% of mainland French towns
Expect July afternoons of about 27.1°C. It is a wet place: more rain falls here than on 77% of mainland French towns. The rainiest month is May; the driest is February. Waterproofs come out on about 118 days a year, each with 1 mm of rain or more.
These are the figures of Météo-France’s Fourneaux station, 22 km north.
A year in Jas at a glance
Each month’s typical high and low in °C, at the Fourneaux station.
What a year in Jas feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Fourneaux.
About 900 mm of rain a year
May is the wettest month and February the driest. About 26 days a year bring 10 mm or more. 2nd wettest of 53 towns of 2,500+ in Loire.
Rain by month
Millimeters
A frosty town: 65 frosts and 76 days of 25°C a year
On about 65 nights a year the air drops to 0°C or below, and on about 9 days it stays below freezing all day. About 76 days a year reach 25°C, and 28 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Fourneaux: 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 Fourneaux
Fourneaux is 22 km north of Jas. Every figure on this page is the station’s, not a measurement in Jas itself.
| Station (Météo-France number) | Fourneaux (42098001) |
| Distance from the town | 22 km north |
| Station altitude | 510 m |
| Town altitude (its center) | 518 m |
| Period | 1991–2020 |
| Nearest station of any kind | 6.4 km |
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 Jas 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 Loire.
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 |
|---|---|---|---|---|
| Jas | Fourneaux | 27.1°C | 0.1°C | 900 mm |
| Panissières 5.6 km | Machézal | 25.4°C 1.7°C cooler | 0.5°C about the same | 820 mm |
| Feurs 7 km | Feurs | 27.3°C about the same | 0.2°C about the same | 650 mm |
| Balbigny 13 km | Feurs | 27.3°C about the same | 0.2°C about the same | 650 mm |
| Montrond-les-Bains 13 km | Feurs | 27.3°C about the same | 0.2°C about the same | 650 mm |
| Chazelles-sur-Lyon 13 km | Chazelles-Lyon | 25.2°C 1.9°C cooler | −0.7°C 0.8°C colder | 764 mm |
| Saint-Symphorien-sur-Coise 17 km | Saint-Symphorien-C | 25.8°C 1.3°C cooler | −1.1°C 1.2°C colder | 861 mm |
Jas weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Fourneaux station.
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 7.1°C | 0.1°C | 3.6°C | 56 mm |
| February | 8.5°C | 0.0°C | 4.3°C | 49 mm |
| March | 13.0°C | 2.4°C | 7.7°C | 49 mm |
| April | 16.5°C | 4.8°C | 10.6°C | 72 mm |
| May | 20.6°C | 8.6°C | 14.6°C | 93 mm |
| June | 24.8°C | 11.9°C | 18.3°C | 87 mm |
| July | 27.1°C | 13.8°C | 20.4°C | 85 mm |
| August | 27.2°C | 13.7°C | 20.5°C | 84 mm |
| September | 22.4°C | 10.3°C | 16.4°C | 83 mm |
| October | 17.3°C | 7.9°C | 12.6°C | 93 mm |
| November | 11.1°C | 3.6°C | 7.4°C | 92 mm |
| December | 7.7°C | 1.0°C | 4.3°C | 58 mm |
| Year | 16.9°C | 6.5°C | 11.7°C | 900 mm |
Where Jas’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Fourneaux, 22 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.
- Comparisons: every town of 2,500 or more in mainland France, read the same way; the dots are the towns of 2,500+ in Loire.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Jas’s climate
How warm does Jas get in summer?
August is the warmest month, with average highs of 27.2°C. About 76 days a year reach 25°C, more than 68% of mainland French towns, and about 28 reach 30°C.
How cold does Jas get in winter?
February nights average 0.0°C. The air drops to 0°C or below on about 65 nights a year, and about 9 days a year stay below freezing all day.
How much rain does Jas get?
About 900 mm a year, more than 77% of mainland French towns. May is the wettest month (93 mm) and February the driest (49 mm).
Are these figures for Jas itself?
No: they are the normals of the Météo-France station matched to Jas, Fourneaux, 22 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 FOURNEAUX, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Jas →
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.