Fewer days reach 25 degrees in Cilly than in 91% of mainland French towns
January nights here settle around 0.8°C. Only 23°C separates winter nights from summer afternoons. Winter nights are cold: in January they are colder than in 77% of mainland French towns. Warm coats and heating bills mark the months from November to April, when means dip under 10°C.
Figures from Météo-France’s Fontaine-lès-Vv station, 11 km north.
A year in Cilly at a glance
Each month’s typical high and low in °C, at the Fontaine-lès-Vv station.
What a year in Cilly feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Fontaine-lès-Vv.
About 826 mm of rain a year
December is the wettest month and April the driest. About 24 days a year bring 10 mm or more. The wettest of 24 towns of 2,500+ in Aisne.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Saint-Quentin
50 frosts and 31 days of 25°C a year
On about 50 nights a year the air drops to 0°C or below, and on about 8 days it stays below freezing all day. About 31 days a year reach 25°C, and 5 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Fontaine-lès-Vv: 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 Fontaine-lès-Vv
Fontaine-lès-Vv is 11 km north of Cilly. Every figure on this page is the station’s, not a measurement in Cilly itself.
| Station (Météo-France number) | Fontaine-lès-Vv (02321002) |
| Distance from the town | 11 km north |
| Station altitude | 186 m |
| Town altitude (its center) | 97 m |
| Period | 1991–2020 |
| Sunshine measured at | Saint-Quentin, 46 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 Cilly 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 |
|---|---|---|---|---|
| Cilly | Fontaine-lès-Vv | 23.4°C | 0.8°C | 826 mm |
| Vervins 12 km | same station | 23.4°C about the same | 0.8°C about the same | 826 mm |
| Athies-sous-Laon 22 km | Aulnois-Ss-Laon | 25.0°C 1.6°C warmer | 1.3°C 0.5°C milder | 686 mm |
| Guise 23 km | same station | 23.4°C about the same | 0.8°C about the same | 826 mm |
| Laon 24 km | Aulnois-Ss-Laon | 25.0°C 1.6°C warmer | 1.3°C 0.5°C milder | 686 mm |
| Hirson 27 km | same station | 23.4°C about the same | 0.8°C about the same | 826 mm |
Cilly weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Fontaine-lès-Vv station; sunshine at Saint-Quentin.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 5.3°C | 0.8°C | 3.0°C | 75 mm | 62 |
| February | 6.3°C | 0.9°C | 3.6°C | 62 mm | 79 |
| March | 10.4°C | 3.1°C | 6.8°C | 62 mm | 135 |
| April | 14.3°C | 5.2°C | 9.8°C | 50 mm | 183 |
| May | 17.9°C | 8.6°C | 13.3°C | 63 mm | 206 |
| June | 20.9°C | 11.5°C | 16.2°C | 67 mm | 208 |
| July | 23.4°C | 13.5°C | 18.4°C | 71 mm | 214 |
| August | 23.2°C | 13.4°C | 18.3°C | 81 mm | 207 |
| September | 19.4°C | 10.7°C | 15.0°C | 59 mm | 167 |
| October | 14.4°C | 7.8°C | 11.1°C | 71 mm | 116 |
| November | 9.0°C | 4.1°C | 6.5°C | 74 mm | 67 |
| December | 5.8°C | 1.5°C | 3.6°C | 92 mm | 54 |
| Year | 14.2°C | 6.8°C | 10.5°C | 826 mm | 1,696 |
Where Cilly’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Fontaine-lès-Vv, 11 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, 46 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 Cilly’s climate
How warm does Cilly get in summer?
July is the warmest month, with average highs of 23.4°C. About 31 days a year reach 25°C, fewer than 91% of mainland French towns, and about 5 reach 30°C.
How cold does Cilly get in winter?
January nights average 0.8°C. The air drops to 0°C or below on about 50 nights a year, and about 8 days a year stay below freezing all day.
How much rain does Cilly get?
About 826 mm a year, more than 67% of mainland French towns. December is the wettest month (92 mm) and April the driest (50 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Saint-Quentin (46 km away), averages 1,696 hours of sunshine a year.
Are these figures for Cilly itself?
No: they are the normals of the Météo-France station matched to Cilly, Fontaine-lès-Vv, 11 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 FONTAINE-LES-VV, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Cilly →
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.