January in Chailley bites harder than in 76% of mainland French towns
On a normal July day the thermometer tops out near 25.6°C. Days of 25°C are scarce: about 51 a year, fewer than in 68% of mainland French towns. Expect the heaviest rain in October and the lightest in July. Gritters and ice scrapers earn their keep on roughly 55 nights a year below 0°C.
These are the figures of Météo-France’s Saint-Mards station, 12 km north-east.
A year in Chailley at a glance
Each month’s typical high and low in °C, at the Saint-Mards station.
What a year in Chailley feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Saint-Mards.
About 760 mm of rain a year
October is the wettest month and July the driest. About 20 days a year bring 10 mm or more. 4th wettest of 19 towns of 2,500+ in Yonne.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Troyes-Barberey
A frosty town: 55 frosts and 51 days of 25°C a year
On about 55 nights a year the air drops to 0°C or below, and on about 8 days it stays below freezing all day. About 51 days a year reach 25°C, and 13 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Saint-Mards: 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 Saint-Mards
Saint-Mards is 12 km north-east of Chailley. Every figure on this page is the station’s, not a measurement in Chailley itself.
| Station (Météo-France number) | Saint-Mards (10350001) |
| Distance from the town | 12 km north-east |
| Station altitude | 227 m |
| Town altitude (its center) | 181 m |
| Period | 1991–2020 |
| Nearest station of any kind | 11 km |
| Sunshine measured at | Troyes-Barberey, 36 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 Chailley 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 Yonne.
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 |
|---|---|---|---|---|
| Chailley | Saint-Mards | 25.6°C | 0.9°C | 760 mm |
| Saint-Florentin 9.3 km | Ligny-le-Châtel | 26.1°C 0.5°C warmer | 1.0°C about the same | 773 mm |
| Brienon-sur-Armançon 12 km | Ligny-le-Châtel | 26.1°C 0.5°C warmer | 1.0°C about the same | 773 mm |
| Aix-Villemaur-Pâlis 17 km | Flacy | 26.2°C 0.6°C warmer | 0.8°C about the same | 741 mm |
| Migennes 19 km | Aillant | 27.5°C 1.9°C warmer | 0.3°C 0.6°C colder | 727 mm |
| Joigny 25 km | Aillant | 27.5°C 1.9°C warmer | 0.3°C 0.6°C colder | 727 mm |
| Appoigny 27 km | Aillant | 27.5°C 1.9°C warmer | 0.3°C 0.6°C colder | 727 mm |
Chailley weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Saint-Mards station; sunshine at Troyes-Barberey.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.1°C | 0.9°C | 3.5°C | 63 mm | 63 |
| February | 7.4°C | 0.8°C | 4.1°C | 57 mm | 90 |
| March | 11.6°C | 2.8°C | 7.2°C | 54 mm | 148 |
| April | 15.1°C | 4.7°C | 9.9°C | 63 mm | 190 |
| May | 19.0°C | 8.2°C | 13.6°C | 72 mm | 216 |
| June | 22.8°C | 11.4°C | 17.1°C | 59 mm | 231 |
| July | 25.6°C | 13.4°C | 19.5°C | 53 mm | 242 |
| August | 25.2°C | 13.4°C | 19.3°C | 60 mm | 232 |
| September | 20.8°C | 10.4°C | 15.6°C | 59 mm | 186 |
| October | 15.7°C | 8.0°C | 11.8°C | 76 mm | 125 |
| November | 9.9°C | 4.2°C | 7.0°C | 69 mm | 70 |
| December | 6.8°C | 1.8°C | 4.3°C | 75 mm | 57 |
| Year | 15.5°C | 6.7°C | 11.1°C | 760 mm | 1,851 |
Where Chailley’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Saint-Mards, 12 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, Troyes-Barberey, 36 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 Yonne.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Chailley’s climate
How warm does Chailley get in summer?
July is the warmest month, with average highs of 25.6°C. About 51 days a year reach 25°C, fewer than 68% of mainland French towns, and about 13 reach 30°C.
How cold does Chailley get in winter?
February nights average 0.8°C. The air drops to 0°C or below on about 55 nights a year, and about 8 days a year stay below freezing all day.
How much rain does Chailley get?
About 760 mm a year, more than 52% of mainland French towns. October is the wettest month (76 mm) and July the driest (53 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Troyes-Barberey (36 km away), averages 1,851 hours of sunshine a year.
Are these figures for Chailley itself?
No: they are the normals of the Météo-France station matched to Chailley, Saint-Mards, 12 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 ST-MARDS, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Chailley →
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.