Frosty mornings in Sissonne outnumber those of 81% of mainland French towns
In July the day’s top temperature is typically 25.1°C. Days of 25°C are scarce: about 45 a year, fewer than in 74% of mainland French towns. Expect the heaviest rain in December and the lightest in April. Waterproofs come out on about 122 days a year, each with 1 mm of rain or more.
Figures from Météo-France’s Nizy-le-Comte station, 10 km east.
A year in Sissonne at a glance
Each month’s typical high and low in °C, at the Nizy-le-Comte station.
What a year in Sissonne feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Nizy-le-Comte.
About 711 mm of rain a year
December is the wettest month and April the driest. About 19 days a year bring 10 mm or more. 10th wettest of 24 towns of 2,500+ in Aisne.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Saint-Quentin
A frosty town: 60 frosts and 45 days of 25°C a year
On about 60 nights a year the air drops to 0°C or below, and on about 6 days it stays below freezing all day. About 45 days a year reach 25°C, and 10 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Nizy-le-Comte: 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 Nizy-le-Comte
Nizy-le-Comte is 10 km east of Sissonne. Every figure on this page is the station’s, not a measurement in Sissonne itself.
| Station (Météo-France number) | Nizy-le-Comte (02705001) |
| Distance from the town | 10 km east |
| Station altitude | 90 m |
| Town altitude (its center) | 76 m |
| Period | 1991–2020 |
| Nearest station of any kind | 8.7 km |
| Sunshine measured at | Saint-Quentin, 57 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 Sissonne 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 |
|---|---|---|---|---|
| Sissonne | Nizy-le-Comte | 25.1°C | 0.6°C | 711 mm |
| Athies-sous-Laon 15 km | Aulnois-Ss-Laon | 25.0°C about the same | 1.3°C 0.7°C milder | 686 mm |
| Villeneuve-sur-Aisne 16 km | same station | 25.1°C about the same | 0.6°C about the same | 711 mm |
| Laon 19 km | Aulnois-Ss-Laon | 25.0°C about the same | 1.3°C 0.7°C milder | 686 mm |
Sissonne weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Nizy-le-Comte station; sunshine at Saint-Quentin.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.2°C | 0.6°C | 3.4°C | 60 mm | 62 |
| February | 7.4°C | 0.5°C | 3.9°C | 52 mm | 79 |
| March | 11.7°C | 2.4°C | 7.1°C | 53 mm | 135 |
| April | 15.5°C | 4.3°C | 9.9°C | 47 mm | 183 |
| May | 19.2°C | 7.9°C | 13.6°C | 61 mm | 206 |
| June | 22.4°C | 10.8°C | 16.6°C | 54 mm | 208 |
| July | 25.1°C | 12.7°C | 18.9°C | 64 mm | 214 |
| August | 24.8°C | 12.5°C | 18.7°C | 68 mm | 207 |
| September | 20.7°C | 9.6°C | 15.1°C | 51 mm | 167 |
| October | 15.6°C | 7.0°C | 11.3°C | 63 mm | 116 |
| November | 9.8°C | 3.6°C | 6.7°C | 62 mm | 67 |
| December | 6.5°C | 1.4°C | 3.9°C | 76 mm | 54 |
| Year | 15.4°C | 6.1°C | 10.8°C | 711 mm | 1,696 |
Where Sissonne’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Nizy-le-Comte, 10 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, 57 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 Sissonne’s climate
How warm does Sissonne get in summer?
July is the warmest month, with average highs of 25.1°C. About 45 days a year reach 25°C, fewer than 74% of mainland French towns, and about 10 reach 30°C.
How cold does Sissonne get in winter?
February nights average 0.5°C. The air drops to 0°C or below on about 60 nights a year, and about 6 days a year stay below freezing all day.
How much rain does Sissonne get?
About 711 mm a year, less than 65% of mainland French towns. December is the wettest month (76 mm) and April the driest (47 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Saint-Quentin (57 km away), averages 1,696 hours of sunshine a year.
Are these figures for Sissonne itself?
No: they are the normals of the Météo-France station matched to Sissonne, Nizy-le-Comte, 10 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 NIZY-LE-COMTE, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Sissonne →
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.