Trefcon is drier than 83% of mainland French towns: 648 mm of rain a year
High summer brings afternoon highs near 24.4°C. Only 23°C separates winter nights from summer afternoons. By warm days alone, it ranks cooler than 82% of mainland French towns. An umbrella earns its place on about 124 days a year with 1 mm of rain or more.
These are the figures of Météo-France’s Estrées-Mons-Inrae station, 5 km west.
A year in Trefcon at a glance
Each month’s typical high and low in °C, at the Estrées-Mons-Inrae station.
What a year in Trefcon feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Estrées-Mons-Inrae.
About 648 mm of rain a year
August is the wettest month and April the driest. About 17 days a year bring 10 mm or more. 24th wettest of 24 towns of 2,500+ in Aisne.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Saint-Quentin
46 frosts and 38 days of 25°C a year
On about 46 nights a year the air drops to 0°C or below, and on about 6 days it stays below freezing all day. About 38 days a year reach 25°C, and 8 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Estrées-Mons-Inrae: 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 Estrées-Mons-Inrae
Estrées-Mons-Inrae is 5 km west of Trefcon. Every figure on this page is the station’s, not a measurement in Trefcon itself.
| Station (Météo-France number) | Estrées-Mons-Inrae (80557001) |
| Distance from the town | 5 km west |
| Station altitude | 87 m |
| Town altitude (its center) | 96 m |
| Period | 1991–2020 |
| Sunshine measured at | Saint-Quentin, 9.1 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 Trefcon 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 |
|---|---|---|---|---|
| Trefcon | Estrées-Mons-Inrae | 24.4°C | 1.3°C | 648 mm |
| Ham 12 km | Saint-Quentin | 24.0°C about the same | 1.1°C about the same | 683 mm |
| Gauchy 14 km | Saint-Quentin | 24.0°C about the same | 1.1°C about the same | 683 mm |
| Saint-Quentin 14 km | Saint-Quentin | 24.0°C about the same | 1.1°C about the same | 683 mm |
| Péronne 14 km | same station | 24.4°C about the same | 1.3°C about the same | 648 mm |
| Fresnoy-le-Grand 25 km | Épehy | 23.7°C 0.7°C cooler | 1.1°C about the same | 753 mm |
| Tergnier 26 km | Chauny | 24.9°C 0.5°C warmer | 1.5°C about the same | 710 mm |
Trefcon weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Estrées-Mons-Inrae station; sunshine at Saint-Quentin.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 6.1°C | 1.3°C | 3.7°C | 50 mm | 62 |
| February | 7.2°C | 1.4°C | 4.3°C | 44 mm | 79 |
| March | 11.2°C | 3.3°C | 7.3°C | 46 mm | 135 |
| April | 15.1°C | 5.1°C | 10.1°C | 37 mm | 183 |
| May | 18.6°C | 8.5°C | 13.6°C | 59 mm | 206 |
| June | 21.6°C | 11.2°C | 16.4°C | 60 mm | 208 |
| July | 24.4°C | 13.0°C | 18.7°C | 57 mm | 214 |
| August | 24.3°C | 13.0°C | 18.6°C | 65 mm | 207 |
| September | 20.5°C | 10.4°C | 15.5°C | 51 mm | 167 |
| October | 15.4°C | 7.8°C | 11.6°C | 58 mm | 116 |
| November | 10.1°C | 4.5°C | 7.3°C | 58 mm | 67 |
| December | 6.6°C | 1.9°C | 4.3°C | 63 mm | 54 |
| Year | 15.1°C | 6.8°C | 11.0°C | 648 mm | 1,696 |
Where Trefcon’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Estrées-Mons-Inrae, 5 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, 9.1 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 Trefcon’s climate
How warm does Trefcon get in summer?
July is the warmest month, with average highs of 24.4°C. About 38 days a year reach 25°C, fewer than 82% of mainland French towns, and about 8 reach 30°C.
How cold does Trefcon get in winter?
January nights average 1.3°C. The air drops to 0°C or below on about 46 nights a year, and about 6 days a year stay below freezing all day.
How much rain does Trefcon get?
About 648 mm a year, less than 83% of mainland French towns. August is the wettest month (65 mm) and April the driest (37 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Saint-Quentin (9.1 km away), averages 1,696 hours of sunshine a year.
Are these figures for Trefcon itself?
No: they are the normals of the Météo-France station matched to Trefcon, Estrées-Mons-Inrae, 5 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 ESTREES-MONS-INRAE, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Trefcon →
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.