Ice on the ground: Lasson sees more frosts than 91% of mainland French towns
Peak summer warmth arrives in July, with afternoons near 26.3°C. The gap between a January night and a July afternoon is 26°C. Garden chairs stay out from June to September, the months with highs of 22–26°C.
Figures from Météo-France’s Chessy-les-Prés station, 8.1 km south-east.
A year in Lasson at a glance
Each month’s typical high and low in °C, at the Chessy-les-Prés station.
What a year in Lasson feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Chessy-les-Prés.
About 757 mm of rain a year
December is the wettest month and July the driest. About 21 days a year bring 10 mm or more. 6th 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: 70 frosts and 61 days of 25°C a year
On about 70 nights a year the air drops to 0°C or below, and on about 5 days it stays below freezing all day. About 61 days a year reach 25°C, and 18 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Chessy-les-Prés: 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 Chessy-les-Prés
Chessy-les-Prés is 8.1 km south-east of Lasson. Every figure on this page is the station’s, not a measurement in Lasson itself.
| Station (Météo-France number) | Chessy-les-Prés (10099002) |
| Distance from the town | 8.1 km south-east |
| Station altitude | 119 m |
| Town altitude (its center) | 139 m |
| Period | 1991–2020 |
| Sunshine measured at | Troyes-Barberey, 33 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 Lasson 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 |
|---|---|---|---|---|
| Lasson | Chessy-les-Prés | 26.3°C | 0.5°C | 757 mm |
| Saint-Florentin 9.3 km | Ligny-le-Châtel | 26.1°C about the same | 1.0°C 0.5°C milder | 773 mm |
| Brienon-sur-Armançon 17 km | Ligny-le-Châtel | 26.1°C about the same | 1.0°C 0.5°C milder | 773 mm |
| Aix-Villemaur-Pâlis 21 km | Flacy | 26.2°C about the same | 0.8°C about the same | 741 mm |
| Migennes 25 km | Aillant | 27.5°C 1.2°C warmer | 0.3°C about the same | 727 mm |
| Tonnerre 25 km | Chablis | 27.2°C 0.9°C warmer | 0.6°C about the same | 740 mm |
Lasson weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Chessy-les-Prés station; sunshine at Troyes-Barberey.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.8°C | 0.5°C | 3.7°C | 64 mm | 63 |
| February | 8.3°C | 0.2°C | 4.3°C | 59 mm | 90 |
| March | 12.6°C | 2.0°C | 7.3°C | 58 mm | 148 |
| April | 16.3°C | 3.8°C | 10.1°C | 58 mm | 190 |
| May | 20.1°C | 7.8°C | 14.0°C | 68 mm | 216 |
| June | 23.7°C | 11.2°C | 17.4°C | 57 mm | 231 |
| July | 26.3°C | 12.9°C | 19.6°C | 57 mm | 242 |
| August | 26.1°C | 12.6°C | 19.3°C | 58 mm | 232 |
| September | 21.7°C | 9.2°C | 15.4°C | 59 mm | 186 |
| October | 16.6°C | 6.8°C | 11.7°C | 74 mm | 125 |
| November | 10.7°C | 3.4°C | 7.0°C | 71 mm | 70 |
| December | 7.4°C | 1.2°C | 4.3°C | 75 mm | 57 |
| Year | 16.4°C | 6.0°C | 11.2°C | 757 mm | 1,851 |
Where Lasson’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Chessy-les-Prés, 8.1 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, 33 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 Lasson’s climate
How warm does Lasson get in summer?
July is the warmest month, with average highs of 26.3°C. About 61 days a year reach 25°C, more than 51% of mainland French towns, and about 18 reach 30°C.
How cold does Lasson get in winter?
February nights average 0.2°C. The air drops to 0°C or below on about 70 nights a year, and about 5 days a year stay below freezing all day.
How much rain does Lasson get?
About 757 mm a year, more than 50% of mainland French towns. December is the wettest month (75 mm) and July the driest (57 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Troyes-Barberey (33 km away), averages 1,851 hours of sunshine a year.
Are these figures for Lasson itself?
No: they are the normals of the Météo-France station matched to Lasson, Chessy-les-Prés, 8.1 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 CHESSY-LES-PRES_SAPC, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Lasson →
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.