Weather without surprises: Troo keeps close to the norm for mainland French towns
January nights average 1.6°C, July afternoons 26.0°C, and a year brings 769 mm of rain. Winter and summer sit 25°C apart. By frosts alone, it ranks colder than 69% of mainland French towns. Waterproofs come out on about 120 days a year, each with 1 mm of rain or more.
Figures from Météo-France’s Saint-Laurent-en-G station, 23 km south.
A year in Troo at a glance
Each month’s typical high and low in °C, at the Saint-Laurent-en-G station.
What a year in Troo feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Saint-Laurent-en-G.
About 769 mm of rain a year
December is the wettest month and August the driest. About 23 days a year bring 10 mm or more. The wettest of 26 towns of 2,500+ in Loir-et-Cher.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Blois
49 frosts and 57 days of 25°C a year
On about 49 nights a year the air drops to 0°C or below, and on about 5 days it stays below freezing all day. About 57 days a year reach 25°C, and 16 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Saint-Laurent-en-G: 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 Saint-Laurent-en-G
Saint-Laurent-en-G is 23 km south of Troo. Every figure on this page is the station’s, not a measurement in Troo itself.
| Station (Météo-France number) | Saint-Laurent-en-G (37224001) |
| Distance from the town | 23 km south |
| Station altitude | 155 m |
| Town altitude (its center) | 79 m |
| Period | 1991–2020 |
| Sunshine measured at | Blois, 34 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 Troo 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 Loir-et-Cher.
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 |
|---|---|---|---|---|
| Troo | Saint-Laurent-en-G | 26.0°C | 1.6°C | 769 mm |
| Montoire-sur-le-Loir 6.4 km | same station | 26.0°C about the same | 1.6°C about the same | 769 mm |
| Saint-Calais 16 km | Cormes | 25.8°C about the same | 1.7°C about the same | 759 mm |
| Vendôme 21 km | Blois | 26.2°C about the same | 1.8°C about the same | 641 mm |
| Saint-Ouen 22 km | Blois | 26.2°C about the same | 1.8°C about the same | 641 mm |
| Château-Renault 22 km | same station | 26.0°C about the same | 1.6°C about the same | 769 mm |
| Montval-sur-Loir 29 km | Saint-Christophe-sur-Nais | 25.9°C about the same | 2.5°C 0.9°C milder | 682 mm |
Troo weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Saint-Laurent-en-G station; sunshine at Blois.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 7.3°C | 1.6°C | 4.5°C | 76 mm | 63 |
| February | 8.6°C | 1.4°C | 5.0°C | 61 mm | 93 |
| March | 12.6°C | 3.3°C | 7.9°C | 57 mm | 148 |
| April | 15.9°C | 4.8°C | 10.4°C | 61 mm | 187 |
| May | 19.5°C | 8.3°C | 13.9°C | 63 mm | 211 |
| June | 23.5°C | 11.4°C | 17.4°C | 53 mm | 210 |
| July | 26.0°C | 13.3°C | 19.7°C | 53 mm | 231 |
| August | 26.0°C | 13.3°C | 19.6°C | 52 mm | 228 |
| September | 21.9°C | 10.2°C | 16.1°C | 56 mm | 187 |
| October | 16.6°C | 8.0°C | 12.3°C | 73 mm | 122 |
| November | 11.0°C | 4.5°C | 7.8°C | 80 mm | 75 |
| December | 7.8°C | 2.1°C | 5.0°C | 86 mm | 59 |
| Year | 16.4°C | 6.8°C | 11.6°C | 769 mm | 1,813 |
Where Troo’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Saint-Laurent-en-G, 23 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, Blois, 34 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 Loir-et-Cher.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Troo’s climate
How warm does Troo get in summer?
July is the warmest month, with average highs of 26.0°C. About 57 days a year reach 25°C, fewer than 57% of mainland French towns, and about 16 reach 30°C.
How cold does Troo get in winter?
February nights average 1.4°C. The air drops to 0°C or below on about 49 nights a year, and about 5 days a year stay below freezing all day.
How much rain does Troo get?
About 769 mm a year, more than 53% of mainland French towns. December is the wettest month (86 mm) and August the driest (52 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Blois (34 km away), averages 1,813 hours of sunshine a year.
Are these figures for Troo itself?
No: they are the normals of the Météo-France station matched to Troo, Saint-Laurent-en-G, 23 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 ST-LAURENT-EN-G, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Troo →
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.