Summer warmth: Châtillon-sur-Oise logs fewer 25-degree days than 85% of mainland French towns
The depth of winter brings overnight lows near 1.1°C. Temperatures cover 23°C across the year, low to high. It is a dry place: less rain falls here than on 75% of mainland French towns. Wet days, with 1 mm of rain or more, come about 120 times a year.
These are the figures of Météo-France’s Saint-Quentin station, 16 km west.
A year in Châtillon-sur-Oise at a glance
Each month’s typical high and low in °C, at the Saint-Quentin station.
What a year in Châtillon-sur-Oise feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Saint-Quentin.
About 683 mm of rain a year
August is the wettest month and April the driest. About 18 days a year bring 10 mm or more. 17th wettest of 24 towns of 2,500+ in Aisne.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Saint-Quentin
49 frosts and 35 days of 25°C a year
On about 49 nights a year the air drops to 0°C or below, and on about 7 days it stays below freezing all day. About 35 days a year reach 25°C, and 7 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Saint-Quentin: 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-Quentin
Saint-Quentin is 16 km west of Châtillon-sur-Oise. Every figure on this page is the station’s, not a measurement in Châtillon-sur-Oise itself.
| Station (Météo-France number) | Saint-Quentin (02320001) |
| Distance from the town | 16 km west |
| Station altitude | 98 m |
| Town altitude (its center) | 69 m |
| Period | 1991–2020 |
| Sunshine measured at | the same station |
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 Châtillon-sur-Oise 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. 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 |
|---|---|---|---|---|
| Châtillon-sur-Oise | Saint-Quentin | 24.0°C | 1.1°C | 683 mm |
| Gauchy 11 km | same station | 24.0°C about the same | 1.1°C about the same | 683 mm |
| Saint-Quentin 11 km | same station | 24.0°C about the same | 1.1°C about the same | 683 mm |
| La Fère 15 km | Chauny | 24.9°C 0.9°C warmer | 1.5°C about the same | 710 mm |
| Beautor 16 km | Chauny | 24.9°C 0.9°C warmer | 1.5°C about the same | 710 mm |
| Tergnier 17 km | Chauny | 24.9°C 0.9°C warmer | 1.5°C about the same | 710 mm |
| Fresnoy-le-Grand 17 km | Épehy | 23.7°C about the same | 1.1°C about the same | 753 mm |
Châtillon-sur-Oise weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Saint-Quentin station.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.0°C | 1.1°C | 3.6°C | 54 mm | 62 |
| February | 7.1°C | 1.2°C | 4.2°C | 48 mm | 79 |
| March | 11.2°C | 3.1°C | 7.2°C | 51 mm | 135 |
| April | 15.0°C | 4.9°C | 10.0°C | 43 mm | 183 |
| May | 18.4°C | 8.3°C | 13.4°C | 57 mm | 206 |
| June | 21.5°C | 11.0°C | 16.2°C | 60 mm | 208 |
| July | 24.0°C | 12.9°C | 18.4°C | 60 mm | 214 |
| August | 23.9°C | 12.9°C | 18.4°C | 71 mm | 207 |
| September | 20.2°C | 10.3°C | 15.2°C | 51 mm | 167 |
| October | 15.2°C | 7.6°C | 11.4°C | 60 mm | 116 |
| November | 9.8°C | 4.1°C | 6.9°C | 57 mm | 67 |
| December | 6.5°C | 1.7°C | 4.1°C | 70 mm | 54 |
| Year | 14.9°C | 6.6°C | 10.8°C | 683 mm | 1,696 |
Where Châtillon-sur-Oise’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Saint-Quentin, 16 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, Saint-Quentin, 16 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 Aisne.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Châtillon-sur-Oise’s climate
How warm does Châtillon-sur-Oise get in summer?
July is the warmest month, with average highs of 24.0°C. About 35 days a year reach 25°C, fewer than 85% of mainland French towns, and about 7 reach 30°C.
How cold does Châtillon-sur-Oise get in winter?
January nights average 1.1°C. The air drops to 0°C or below on about 49 nights a year, and about 7 days a year stay below freezing all day.
How much rain does Châtillon-sur-Oise get?
About 683 mm a year, less than 75% of mainland French towns. August is the wettest month (71 mm) and April the driest (43 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Saint-Quentin (16 km away), averages 1,696 hours of sunshine a year.
Are these figures for Châtillon-sur-Oise itself?
No: they are the normals of the Météo-France station matched to Châtillon-sur-Oise, Saint-Quentin, 16 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 QUENTIN, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Châtillon-sur-Oise →
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.