Saint-Clair is among the driest of mainland French towns: 584 mm of rain a year
Nights in January average 2.1°C. About 51 nights a year bring a frost, more than in 72% of mainland French towns. From frosty January to warm July, readings climb 25°C. Wet days, with 1 mm of rain or more, come about 106 times a year.
These are the figures of Météo-France’s Martaizé station, 4.8 km north-west.
A year in Saint-Clair at a glance
Each month’s typical high and low in °C, at the Martaizé station.
What a year in Saint-Clair feels like
Typical highs and lows by season and by month, from Météo-France’s 1991–2020 normals at Martaizé.
About 584 mm of rain a year
October is the wettest month and August the driest. About 16 days a year bring 10 mm or more. 38th wettest of 37 towns of 2,500+ in Vienne.
Rain by month
Millimeters
Sunshine by month
Hours of sunshine at Loudun
A frosty town: 51 frosts and 69 days of 25°C a year
On about 51 nights a year the air drops to 0°C or below, and on about 3 days it stays below freezing all day. About 69 days a year reach 25°C, and 19 reach 30°C.
Day counts are Météo-France’s 1991–2020 normals at Martaizé: 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 Martaizé
Martaizé is 4.8 km north-west of Saint-Clair. Every figure on this page is the station’s, not a measurement in Saint-Clair itself.
| Station (Météo-France number) | Martaizé (86149001) |
| Distance from the town | 4.8 km north-west |
| Station altitude | 61 m |
| Town altitude (its center) | 78 m |
| Period | 1993–2016 (the station’s own record) |
| Sunshine measured at | Loudun, 17 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 Saint-Clair 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 Vienne.
Nearby towns’ climate
The nearest towns of 2,500+ within 29 km, each with its own matched station.
| Town | Station | July high | January low | Rain a year |
|---|---|---|---|---|
| Saint-Clair | Martaizé | 26.8°C | 2.1°C | 584 mm |
| Loudun 14 km | Loudun | 26.0°C 0.8°C cooler | 2.7°C 0.6°C milder | 632 mm |
| Airvault 17 km | Glénay | 27.1°C about the same | 2.5°C about the same | 648 mm |
| Saint-Martin-la-Pallu 25 km | Neuville de Poi | 27.2°C about the same | 2.2°C about the same | 705 mm |
| Thouars 25 km | Thouars-Stna | 27.5°C 0.7°C warmer | 2.9°C 0.8°C milder | 576 mm |
| Neuville-de-Poitou 26 km | Neuville de Poi | 27.2°C about the same | 2.2°C about the same | 705 mm |
| Vouillé 28 km | Vouillé | 26.9°C about the same | 2.0°C about the same | 657 mm |
Saint-Clair weather by month
Average daily high and low, mean temperature and rain, 1991–2020, at the Martaizé station; sunshine at Loudun.
| Month | High | Low | Mean | Rain | Sun (hours) |
|---|---|---|---|---|---|
| January | 8.6°C | 2.1°C | 5.3°C | 51 mm | 70 |
| February | 10.1°C | 1.6°C | 5.9°C | 40 mm | 105 |
| March | 14.0°C | 2.6°C | 8.3°C | 40 mm | 156 |
| April | 17.0°C | 4.6°C | 10.8°C | 47 mm | 198 |
| May | 20.8°C | 8.3°C | 14.5°C | 49 mm | 229 |
| June | 24.8°C | 11.3°C | 18.0°C | 50 mm | 247 |
| July | 26.8°C | 12.9°C | 19.8°C | 42 mm | 260 |
| August | 26.7°C | 12.7°C | 19.7°C | 38 mm | 237 |
| September | 23.0°C | 9.6°C | 16.3°C | 45 mm | 206 |
| October | 18.3°C | 8.3°C | 13.3°C | 64 mm | 130 |
| November | 12.4°C | 4.6°C | 8.5°C | 60 mm | 87 |
| December | 9.0°C | 2.4°C | 5.7°C | 59 mm | 78 |
| Year | 17.6°C | 6.8°C | 12.2°C | 584 mm | 2,003 |
Where Saint-Clair’s numbers come from
Averages over 30 years, not a forecast.
- Temperature, rain and day counts: Météo-France’s fiche climatologique for Martaizé, 4.8 km away: statistics for 1991–2020 (the station’s own years, 1993–2016, where its record is shorter).
- 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, Loudun, 17 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 Vienne.
Météo-France fiches climatologiques · IGN RGE ALTI®. Licence Ouverte 2.0.
Questions about Saint-Clair’s climate
How warm does Saint-Clair get in summer?
July is the warmest month, with average highs of 26.8°C. About 69 days a year reach 25°C, more than 61% of mainland French towns, and about 19 reach 30°C.
How cold does Saint-Clair get in winter?
February nights average 1.6°C. The air drops to 0°C or below on about 51 nights a year, and about 3 days a year stay below freezing all day.
How much rain does Saint-Clair get?
About 584 mm a year, less than 97% of mainland French towns. October is the wettest month (64 mm) and August the driest (38 mm).
How sunny is it?
The nearest Météo-France station that records sunshine, Loudun (17 km away), averages 2,003 hours of sunshine a year.
Are these figures for Saint-Clair itself?
No: they are the normals of the Météo-France station matched to Saint-Clair, Martaizé, 4.8 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 MARTAIZE, edited 15/10/2026); altitude: IGN, RGE ALTI®. Licence Ouverte 2.0. Today’s forecast for Saint-Clair →
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.