Photo: Mathis Brancquart · CC BY-SA 4.0Few mainland French towns have colder winter nights than Grésy-sur-Aix
On a normal July day the thermometer tops out near 27.5°C. By rainfall alone, it ranks wetter than 98% of mainland French towns. Of all months, October brings the most rain and February the least. Plan time outside for May, June, August and September, when highs sit at 21–27°C.
Figures from Météo-France’s Mognard station, 5 km north-east.
A year in Grésy-sur-Aix at a glance
Each month’s typical high and low in °C, at the Mognard station.
What a year in Grésy-sur-Aix feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Mognard.
About 1,280 mm of rain a year
October is the wettest month and February the driest. About 46 days a year bring 10 mm or more. 5th wettest of 37 towns of 2,500+ in Savoie.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Chambery-Aix
A frosty town: 91 frosts and 78 days of 25°C a year
On about 91 nights a year the air drops to 0°C or below, and on about 5 days it stays below freezing all day. About 78 days a year reach 25°C, and 26 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Mognard: 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 Mognard
Mognard is 5 km north-east of Grésy-sur-Aix. Every figure on this page is the station’s, not a measurement in Grésy-sur-Aix itself.
| Station (Météo-France number) | Mognard (73158001) |
| Distance from the town | 5 km north-east |
| Station altitude | 340 m |
| Town altitude (its center) | 336 m |
| Period | 1991–2020 |
| Nearest station of any kind | 4 km |
| Sunshine measured at | Chambery-Aix, 9.8 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 Grésy-sur-Aix 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 Savoie.
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 |
|---|---|---|---|---|
| Grésy-sur-Aix | Mognard | 27.5°C | −2.0°C | 1,280 mm |
| Aix-les-Bains 3.5 km | Chambery-Aix | 27.8°C about the same | −0.7°C 1.3°C milder | 1,204 mm |
| La Biolle 4.2 km | same station | 27.5°C about the same | −2.0°C about the same | 1,280 mm |
| Tresserve 5.3 km | same station | 27.5°C about the same | −2.0°C about the same | 1,280 mm |
| Drumettaz-Clarafond 6.7 km | Chambery-Aix | 27.8°C about the same | −0.7°C 1.3°C milder | 1,204 mm |
| Entrelacs 6.9 km | Bloye | 27.8°C about the same | −1.5°C 0.5°C milder | 1,207 mm |
| Le Bourget-du-Lac 10 km | Chambery-Aix | 27.8°C about the same | −0.7°C 1.3°C milder | 1,204 mm |
Grésy-sur-Aix weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Mognard station; sunshine at Chambery-Aix.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 5.6°C | −2.0°C | 1.8°C | 100 mm | 77 |
| February | 8.0°C | −1.8°C | 3.1°C | 84 mm | 102 |
| March | 13.2°C | 0.8°C | 7.0°C | 94 mm | 158 |
| April | 17.0°C | 3.9°C | 10.5°C | 97 mm | 176 |
| May | 21.2°C | 8.3°C | 14.7°C | 109 mm | 202 |
| June | 25.1°C | 11.9°C | 18.5°C | 108 mm | 236 |
| July | 27.5°C | 13.2°C | 20.4°C | 98 mm | 262 |
| August | 27.0°C | 13.0°C | 20.0°C | 113 mm | 237 |
| September | 22.2°C | 9.6°C | 15.9°C | 113 mm | 181 |
| October | 16.8°C | 6.4°C | 11.6°C | 125 mm | 124 |
| November | 10.1°C | 1.8°C | 5.9°C | 118 mm | 75 |
| December | 6.0°C | −1.2°C | 2.4°C | 123 mm | 66 |
| Year | 16.6°C | 5.3°C | 11.0°C | 1,280 mm | 1,895 |
Where Grésy-sur-Aix’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Mognard, 5 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, Chambery-Aix, 9.8 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 Savoie.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Grésy-sur-Aix’s climate
How warm does Grésy-sur-Aix get in summer?
July is the warmest month, with average highs of 27.5°C. About 78 days a year reach 25°C, more than 70% of mainland French towns, and about 26 reach 30°C.
How cold does Grésy-sur-Aix get in winter?
January nights average −2.0°C. The air drops to 0°C or below on about 91 nights a year, and about 5 days a year stay below freezing all day.
How much rain does Grésy-sur-Aix get?
About 1,280 mm a year, more than 98% of mainland French towns. October is the wettest month (125 mm) and February the driest (84 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Chambery-Aix (9.8 km away), averages 1,895 hours of sunshine a year.
Are these figures for Grésy-sur-Aix itself?
No: they are the normals of the Météo-France station matched to Grésy-sur-Aix, Mognard, 5 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 MOGNARD, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Grésy-sur-Aix →
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.