Winter nights in Lachy are colder than in 76% of mainland French towns
In July the day’s top temperature is typically 25.4°C. Days of 25°C are scarce: about 49 a year, fewer than in 70% of mainland French towns. The gap between a January night and a July afternoon is 25°C. An umbrella earns its place on about 119 days a year with 1 mm of rain or more.
These are the figures of Météo-France’s Esternay station, 9.8 km west.
A year in Lachy at a glance
Each month’s typical high and low in °C, at the Esternay station.
What a year in Lachy feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Esternay.
About 701 mm of rain a year
December is the wettest month and April the driest. About 18 days a year bring 10 mm or more. 13th wettest of 22 towns of 2,500+ in Marne.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Troyes-Barberey
A frosty town: 53 frosts and 49 days of 25°C a year
On about 53 nights a year the air drops to 0°C or below, and on about 6 days it stays below freezing all day. About 49 days a year reach 25°C, and 12 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Esternay: 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 Esternay
Esternay is 9.8 km west of Lachy. Every figure on this page is the station’s, not a measurement in Lachy itself.
| Station (Météo-France number) | Esternay (51237002) |
| Distance from the town | 9.8 km west |
| Station altitude | 185 m |
| Town altitude (its center) | 185 m |
| Period | 1994–2020 (the station’s own record) |
| Sunshine measured at | Troyes-Barberey, 54 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 Lachy 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 Marne.
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 |
|---|---|---|---|---|
| Lachy | Esternay | 25.4°C | 0.9°C | 701 mm |
| Sézanne 5.3 km | Esternay-Man | 26.0°C 0.6°C warmer | 0.4°C 0.5°C colder | 781 mm |
| Montmirail 17 km | same station | 25.4°C about the same | 0.9°C about the same | 701 mm |
| Villenauxe-la-Grande 22 km | Romilly | 26.2°C 0.8°C warmer | 0.8°C about the same | 620 mm |
| Blancs-Coteaux 27 km | Fagnières-Inrae | 25.9°C 0.5°C warmer | 0.5°C about the same | 632 mm |
| Romilly-sur-Seine 28 km | Romilly | 26.2°C 0.8°C warmer | 0.8°C about the same | 620 mm |
Lachy weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Esternay station; sunshine at Troyes-Barberey.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 5.9°C | 0.9°C | 3.4°C | 59 mm | 63 |
| February | 7.5°C | 1.1°C | 4.3°C | 55 mm | 90 |
| March | 11.4°C | 2.7°C | 7.1°C | 49 mm | 148 |
| April | 15.5°C | 4.8°C | 10.1°C | 47 mm | 190 |
| May | 19.0°C | 8.2°C | 13.6°C | 70 mm | 216 |
| June | 22.8°C | 11.2°C | 17.0°C | 54 mm | 231 |
| July | 25.4°C | 13.1°C | 19.3°C | 59 mm | 242 |
| August | 25.1°C | 13.1°C | 19.1°C | 52 mm | 232 |
| September | 20.9°C | 10.1°C | 15.5°C | 51 mm | 186 |
| October | 15.9°C | 7.8°C | 11.9°C | 69 mm | 125 |
| November | 9.9°C | 4.2°C | 7.1°C | 61 mm | 70 |
| December | 6.6°C | 1.7°C | 4.1°C | 75 mm | 57 |
| Year | 15.5°C | 6.6°C | 11.0°C | 701 mm | 1,851 |
Where Lachy’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Esternay, 9.8 km away: statistics for 1991–2020 (the station’s own years, 1994–2020, where its record is shorter).
- 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, 54 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 Marne.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Lachy’s climate
How warm does Lachy get in summer?
July is the warmest month, with average highs of 25.4°C. About 49 days a year reach 25°C, fewer than 70% of mainland French towns, and about 12 reach 30°C.
How cold does Lachy get in winter?
January nights average 0.9°C. The air drops to 0°C or below on about 53 nights a year, and about 6 days a year stay below freezing all day.
How much rain does Lachy get?
About 701 mm a year, less than 67% of mainland French towns. December is the wettest month (75 mm) and April the driest (47 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Troyes-Barberey (54 km away), averages 1,851 hours of sunshine a year.
Are these figures for Lachy itself?
No: they are the normals of the Météo-France station matched to Lachy, Esternay, 9.8 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 ESTERNAY, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Lachy →
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.