Photo: Annick Bregain · CC BY-SA 4.0Fewer days reach 25 degrees in Château-Thierry than in 81% of mainland French towns
Nights in January average 0.8°C. In January, nights here are colder than in 77% of mainland French towns. Seasons differ by 24°C, from the coldest nights to the warmest afternoons. Warm coats and heating bills mark the months from November to April, when means dip under 10°C.
These are the figures of Météo-France’s Blesmes station, 6.7 km south-east.
A year in Château-Thierry at a glance
Each month’s typical high and low in °C, at the Blesmes station.
What a year in Château-Thierry feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Blesmes.
About 713 mm of rain a year
December is the wettest month and April the driest. About 19 days a year bring 10 mm or more. 9th wettest of 24 towns of 2,500+ in Aisne.
Rain by month
Millimeters
A frosty town: 51 frosts and 40 days of 25°C a year
On about 51 nights a year the air drops to 0°C or below, and on about 8 days it stays below freezing all day. About 40 days a year reach 25°C, and 8 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Blesmes: 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 Blesmes
Blesmes is 6.7 km south-east of Château-Thierry. Every figure on this page is the station’s, not a measurement in Château-Thierry itself.
| Station (Météo-France number) | Blesmes (02094001) |
| Distance from the town | 6.7 km south-east |
| Station altitude | 222 m |
| Town altitude (its center) | 85 m |
| Period | 1991–2020 |
Château-Thierry sits 137 m lower than the station. Air usually warms by about 0.65°C every 100 m you go down, so expect Château-Thierry to run about 0.9°C warmer than these figures.
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 Château-Thierry 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 Aisne.
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 |
|---|---|---|---|---|
| Château-Thierry | Blesmes | 24.4°C | 0.8°C | 713 mm |
| Essômes-sur-Marne 3.3 km | Saint-Cyr/Morin-Bg | 25.5°C 1.1°C warmer | 1.0°C about the same | 815 mm |
| Charly-sur-Marne 11 km | Saint-Cyr/Morin-Bg | 25.5°C 1.1°C warmer | 1.0°C about the same | 815 mm |
| Dormans 18 km | Chambrecy-Civc | 25.4°C 1°C warmer | 0.4°C about the same | 734 mm |
| Fère-en-Tardenois 19 km | Braine | 25.4°C 1°C warmer | 1.4°C 0.6°C milder | 663 mm |
| La Ferté-sous-Jouarre 22 km | Ussy-sur-Marne | 25.9°C 1.5°C warmer | 0.9°C about the same | 727 mm |
| Montmirail 23 km | Esternay | 25.4°C 1°C warmer | 0.9°C about the same | 701 mm |
Château-Thierry weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Blesmes station.
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 5.5°C | 0.8°C | 3.1°C | 64 mm |
| February | 6.7°C | 0.9°C | 3.8°C | 52 mm |
| March | 10.9°C | 2.9°C | 6.9°C | 53 mm |
| April | 14.7°C | 4.9°C | 9.8°C | 48 mm |
| May | 18.3°C | 8.2°C | 13.2°C | 64 mm |
| June | 21.6°C | 10.9°C | 16.3°C | 56 mm |
| July | 24.4°C | 12.9°C | 18.7°C | 58 mm |
| August | 24.4°C | 13.0°C | 18.7°C | 62 mm |
| September | 20.1°C | 10.3°C | 15.2°C | 53 mm |
| October | 14.9°C | 7.7°C | 11.3°C | 65 mm |
| November | 9.3°C | 4.0°C | 6.6°C | 62 mm |
| December | 6.0°C | 1.6°C | 3.8°C | 77 mm |
| Year | 14.7°C | 6.5°C | 10.6°C | 713 mm |
Where Château-Thierry’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Blesmes, 6.7 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.
- Comparisons: every town of 2,500 or more in mainland France, read the same way; the dots are the towns of 2,500+ in Aisne.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Château-Thierry’s climate
How warm does Château-Thierry get in summer?
July is the warmest month, with average highs of 24.4°C. About 40 days a year reach 25°C, fewer than 81% of mainland French towns, and about 8 reach 30°C.
How cold does Château-Thierry get in winter?
January nights average 0.8°C. The air drops to 0°C or below on about 51 nights a year, and about 8 days a year stay below freezing all day.
How much rain does Château-Thierry get?
About 713 mm a year, less than 64% of mainland French towns. December is the wettest month (77 mm) and April the driest (48 mm).
Are these figures for Château-Thierry itself?
No: they are the normals of the Météo-France station matched to Château-Thierry, Blesmes, 6.7 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 BLESMES, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Château-Thierry →
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.