Billy-sur-Ourcq is drier than 80% of mainland French towns: 663 mm of rain a year
Midsummer highs settle at about 25.4°C. Frosty nights outnumber those of 73% of mainland French towns. Wet weather is most frequent in December and least in April. Waterproofs come out on about 119 days a year, each with 1 mm of rain or more.
Figures from Météo-France’s Braine station, 22 km north-east.
A year in Billy-sur-Ourcq at a glance
Each month’s typical high and low in °C, at the Braine station.
What a year in Billy-sur-Ourcq feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Braine.
About 663 mm of rain a year
December is the wettest month and April the driest. About 16 days a year bring 10 mm or more. 19th wettest of 24 towns of 2,500+ in Aisne.
Rain by month
Millimeters
A frosty town: 53 frosts and 50 days of 25°C a year
On about 53 nights a year the air drops to 0°C or below, and on about 5 days it stays below freezing all day. About 50 days a year reach 25°C, and 13 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Braine: 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 Braine
Braine is 22 km north-east of Billy-sur-Ourcq. Every figure on this page is the station’s, not a measurement in Billy-sur-Ourcq itself.
| Station (Météo-France number) | Braine (02110002) |
| Distance from the town | 22 km north-east |
| Station altitude | 61 m |
| Town altitude (its center) | 157 m |
| Period | 1991–2020 |
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 Billy-sur-Ourcq 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 |
|---|---|---|---|---|
| Billy-sur-Ourcq | Braine | 25.4°C | 1.4°C | 663 mm |
| Fère-en-Tardenois 16 km | same station | 25.4°C about the same | 1.4°C about the same | 663 mm |
| Villers-Cotterêts 16 km | Margny-lès-Compiègne | 24.7°C 0.7°C cooler | 1.5°C about the same | 634 mm |
| Belleu 16 km | same station | 25.4°C about the same | 1.4°C about the same | 663 mm |
| Soissons 18 km | same station | 25.4°C about the same | 1.4°C about the same | 663 mm |
| Villeneuve-Saint-Germain 18 km | same station | 25.4°C about the same | 1.4°C about the same | 663 mm |
| Château-Thierry 20 km | Blesmes | 24.4°C 1°C cooler | 0.8°C 0.6°C colder | 713 mm |
Billy-sur-Ourcq weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Braine station.
| Month | High | Low | Mean | Rain |
|---|---|---|---|---|
| January | 6.7°C | 1.4°C | 4.0°C | 59 mm |
| February | 8.0°C | 1.3°C | 4.6°C | 47 mm |
| March | 12.2°C | 2.9°C | 7.6°C | 49 mm |
| April | 16.0°C | 4.6°C | 10.3°C | 43 mm |
| May | 19.6°C | 8.2°C | 13.9°C | 60 mm |
| June | 22.8°C | 11.1°C | 17.0°C | 56 mm |
| July | 25.4°C | 13.1°C | 19.3°C | 61 mm |
| August | 25.2°C | 12.8°C | 19.0°C | 61 mm |
| September | 21.2°C | 10.0°C | 15.6°C | 46 mm |
| October | 16.1°C | 7.7°C | 11.9°C | 56 mm |
| November | 10.4°C | 4.4°C | 7.4°C | 54 mm |
| December | 7.2°C | 2.1°C | 4.6°C | 72 mm |
| Year | 15.9°C | 6.6°C | 11.3°C | 663 mm |
Where Billy-sur-Ourcq’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Braine, 22 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 Billy-sur-Ourcq’s climate
How warm does Billy-sur-Ourcq get in summer?
July is the warmest month, with average highs of 25.4°C. About 50 days a year reach 25°C, fewer than 68% of mainland French towns, and about 13 reach 30°C.
How cold does Billy-sur-Ourcq get in winter?
February nights average 1.3°C. The air drops to 0°C or below on about 53 nights a year, and about 5 days a year stay below freezing all day.
How much rain does Billy-sur-Ourcq get?
About 663 mm a year, less than 80% of mainland French towns. December is the wettest month (72 mm) and April the driest (43 mm).
Are these figures for Billy-sur-Ourcq itself?
No: they are the normals of the Météo-France station matched to Billy-sur-Ourcq, Braine, 22 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 BRAINE, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Billy-sur-Ourcq →
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.