Less rain falls on Courcelles-sur-Viosne than on 86% of mainland French towns: 636 mm a year
The coldest hours of a January night bottom out at 1.6°C on average. Only 24°C separates winter nights from summer afternoons. Warm afternoons come less often than in 76% of mainland French towns. An umbrella earns its place on about 113 days a year with 1 mm of rain or more.
These are the figures of Météo-France’s Pontoise - Aéro station, 2.4 km north-east.
A year in Courcelles-sur-Viosne at a glance
Each month’s typical high and low in °C, at the Pontoise - Aéro station.
What a year in Courcelles-sur-Viosne feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Pontoise - Aéro.
About 636 mm of rain a year
December is the wettest month and April the driest. About 17 days a year bring 10 mm or more. 45th wettest of 76 towns of 2,500+ in Val-d'Oise.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Le Bourget
48 frosts and 44 days of 25°C a year
On about 48 nights a year the air drops to 0°C or below, and on about 4 days it stays below freezing all day. About 44 days a year reach 25°C, and 10 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Pontoise - Aéro: 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 Pontoise - Aéro
Pontoise - Aéro is 2.4 km north-east of Courcelles-sur-Viosne. Every figure on this page is the station’s, not a measurement in Courcelles-sur-Viosne itself.
| Station (Météo-France number) | Pontoise - Aéro (95078001) |
| Distance from the town | 2.4 km north-east |
| Station altitude | 87 m |
| Town altitude (its center) | 52 m |
| Period | 1991–2020 |
| Sunshine measured at | Le Bourget, 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 Courcelles-sur-Viosne 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 Val-d'Oise.
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 |
|---|---|---|---|---|
| Courcelles-sur-Viosne | Pontoise - Aéro | 24.9°C | 1.6°C | 636 mm |
| Courdimanche 3.6 km | same station | 24.9°C about the same | 1.6°C about the same | 636 mm |
| Cergy 4.5 km | same station | 24.9°C about the same | 1.6°C about the same | 636 mm |
| Osny 4.6 km | Pontoise -Ville | 26.1°C 1.2°C warmer | 2.7°C 1.1°C milder | 667 mm |
| Menucourt 5.6 km | same station | 24.9°C about the same | 1.6°C about the same | 636 mm |
| Vauréal 5.6 km | same station | 24.9°C about the same | 1.6°C about the same | 636 mm |
| Pontoise 7.1 km | Pontoise -Ville | 26.1°C 1.2°C warmer | 2.7°C 1.1°C milder | 667 mm |
Courcelles-sur-Viosne weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Pontoise - Aéro station; sunshine at Le Bourget.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 7.0°C | 1.6°C | 4.3°C | 54 mm | 57 |
| February | 8.2°C | 1.4°C | 4.8°C | 46 mm | 74 |
| March | 12.0°C | 3.2°C | 7.6°C | 47 mm | 129 |
| April | 15.6°C | 4.8°C | 10.2°C | 44 mm | 171 |
| May | 19.0°C | 8.2°C | 13.6°C | 60 mm | 189 |
| June | 22.3°C | 11.0°C | 16.7°C | 50 mm | 203 |
| July | 24.9°C | 12.9°C | 18.9°C | 52 mm | 213 |
| August | 24.9°C | 12.8°C | 18.8°C | 55 mm | 206 |
| September | 21.0°C | 10.0°C | 15.5°C | 47 mm | 162 |
| October | 16.0°C | 7.7°C | 11.9°C | 58 mm | 111 |
| November | 10.7°C | 4.4°C | 7.5°C | 55 mm | 64 |
| December | 7.4°C | 2.1°C | 4.7°C | 68 mm | 54 |
| Year | 15.8°C | 6.7°C | 11.2°C | 636 mm | 1,634 |
Where Courcelles-sur-Viosne’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Pontoise - Aéro, 2.4 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, Le Bourget, 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 Val-d'Oise.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Courcelles-sur-Viosne’s climate
How warm does Courcelles-sur-Viosne get in summer?
July is the warmest month, with average highs of 24.9°C. About 44 days a year reach 25°C, fewer than 76% of mainland French towns, and about 10 reach 30°C.
How cold does Courcelles-sur-Viosne get in winter?
February nights average 1.4°C. The air drops to 0°C or below on about 48 nights a year, and about 4 days a year stay below freezing all day.
How much rain does Courcelles-sur-Viosne get?
About 636 mm a year, less than 86% of mainland French towns. December is the wettest month (68 mm) and April the driest (44 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Le Bourget (33 km away), averages 1,634 hours of sunshine a year.
Are these figures for Courcelles-sur-Viosne itself?
No: they are the normals of the Météo-France station matched to Courcelles-sur-Viosne, Pontoise - Aéro, 2.4 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 PONTOISE - AERO, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Courcelles-sur-Viosne →
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.