Chalmaison is drier than 86% of mainland French towns: 636 mm of rain a year
Midsummer highs settle at about 26.3°C. No month is much wetter than another: October, the wettest, gets little more than March, the driest. Frosty nights outnumber those of 74% of mainland French towns. Expect about 53 frosty starts a year, nights when the air falls below freezing.
Figures from Météo-France’s Bouy-sur-Orvin station, 19 km east.
A year in Chalmaison at a glance
Each month’s typical high and low in °C, at the Bouy-sur-Orvin station.
What a year in Chalmaison feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Bouy-sur-Orvin.
About 636 mm of rain a year
October is the wettest month and March the driest. About 15 days a year bring 10 mm or more. 117th wettest of 116 towns of 2,500+ in Seine-et-Marne.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Melun
A frosty town: 53 frosts and 57 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 57 days a year reach 25°C, and 17 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Bouy-sur-Orvin: 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 Bouy-sur-Orvin
Bouy-sur-Orvin is 19 km east of Chalmaison. Every figure on this page is the station’s, not a measurement in Chalmaison itself.
| Station (Météo-France number) | Bouy-sur-Orvin (10057001) |
| Distance from the town | 19 km east |
| Station altitude | 102 m |
| Town altitude (its center) | 75 m |
| Period | 1991–2020 |
| Nearest station of any kind | 16 km |
| Sunshine measured at | Melun, 44 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 Chalmaison 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 Seine-et-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 |
|---|---|---|---|---|
| Chalmaison | Bouy-sur-Orvin | 26.3°C | 1.3°C | 636 mm |
| Provins 8.4 km | Voulton | 25.6°C 0.7°C cooler | 1.2°C about the same | 741 mm |
| Donnemarie-Dontilly 9 km | La Brosse-Mx | 26.4°C about the same | 2.0°C 0.7°C milder | 653 mm |
| Nogent-sur-Seine 19 km | same station | 26.3°C about the same | 1.3°C about the same | 636 mm |
| Nangis 19 km | Nangis | 25.3°C 1°C cooler | 1.3°C about the same | 704 mm |
| Villeneuve-la-Guyard 21 km | La Brosse-Mx | 26.4°C about the same | 2.0°C 0.7°C milder | 653 mm |
| Saint-Germain-Laval 22 km | La Brosse-Mx | 26.4°C about the same | 2.0°C 0.7°C milder | 653 mm |
Chalmaison weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Bouy-sur-Orvin station; sunshine at Melun.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.5°C | 1.3°C | 3.9°C | 48 mm | 60 |
| February | 7.9°C | 1.1°C | 4.5°C | 45 mm | 83 |
| March | 12.2°C | 2.8°C | 7.5°C | 44 mm | 143 |
| April | 16.0°C | 4.6°C | 10.3°C | 49 mm | 188 |
| May | 19.7°C | 8.3°C | 14.0°C | 59 mm | 216 |
| June | 23.4°C | 11.1°C | 17.2°C | 57 mm | 226 |
| July | 26.3°C | 13.2°C | 19.8°C | 50 mm | 235 |
| August | 26.0°C | 13.3°C | 19.6°C | 59 mm | 225 |
| September | 21.6°C | 10.3°C | 16.0°C | 50 mm | 180 |
| October | 16.2°C | 7.8°C | 12.0°C | 61 mm | 119 |
| November | 10.4°C | 4.3°C | 7.3°C | 54 mm | 68 |
| December | 7.1°C | 2.0°C | 4.6°C | 59 mm | 54 |
| Year | 16.1°C | 6.7°C | 11.4°C | 636 mm | 1,798 |
Where Chalmaison’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Bouy-sur-Orvin, 19 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, Melun, 44 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 Seine-et-Marne.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Chalmaison’s climate
How warm does Chalmaison get in summer?
July is the warmest month, with average highs of 26.3°C. About 57 days a year reach 25°C, fewer than 57% of mainland French towns, and about 17 reach 30°C.
How cold does Chalmaison get in winter?
February nights average 1.1°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 Chalmaison get?
About 636 mm a year, less than 86% of mainland French towns. October is the wettest month (61 mm) and March the driest (44 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Melun (44 km away), averages 1,798 hours of sunshine a year.
Are these figures for Chalmaison itself?
No: they are the normals of the Météo-France station matched to Chalmaison, Bouy-sur-Orvin, 19 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 BOUY-SUR-ORVIN, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Chalmaison →
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.