La Véloscénie, stage 3: Mortagne-au-Perche → Chartres
On stage 3 (Mortagne-au-Perche → Chartres, 114 km) the best month is September: 80% of days were dry with highs of 10–30 °C; the wind barely favours either direction (2.0 km/h on average; ERA5 2006–2025, 9:00–18:00).
Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 14% | 22% | 61 | 7 °C | 0% | 78% | 8.7 † |
| February | 27% | 22% | 52 | 8 °C | 0% | 63% | 10.1 † |
| March | 49% | 27% | 59 | 12 °C | 0% | 36% | 11.7 |
| April | 72% | 24% | 47 | 15 °C | 0% | 8% | 13.6 |
| May | 71% | 29% | 70 | 18 °C | 0% | 1% | 15.2 |
| June | 72% | 24% | 61 | 22 °C | 4% | 0% | 16.1 |
| July | 73% | 19% | 44 | 24 °C | 10% | 0% | 15.7 |
| August | 75% | 17% | 47 | 24 °C | 9% | 0% | 14.3 |
| September | 80% | 17% | 45 | 21 °C | 3% | 0% | 12.5 |
| October | 74% | 23% | 73 | 16 °C | 0% | 3% | 10.7 † |
| November | 47% | 23% | 63 | 11 °C | 0% | 38% | 9.1 † |
| December | 19% | 23% | 66 | 8 °C | 0% | 69% | 8.3 † |
Best months are all months within 3 percentage points of the best one. † less than 11 hours of daylight — long stages get tight.
Wind by month
| Month | Wind Mortagne-au-Perche → Chartres, km/h | Headwind > 15 km/h, Mortagne-au-Perche → Chartres | Headwind > 15 km/h, Chartres → Mortagne-au-Perche | Better way |
|---|---|---|---|---|
| January | +3.7 | 5% | 18% | Mortagne-au-Perche → Chartres |
| February | +3.2 | 7% | 18% | Mortagne-au-Perche → Chartres |
| March | +2.0 | 7% | 16% | either |
| April | +0.3 | 8% | 10% | either |
| May | +2.1 | 5% | 13% | Mortagne-au-Perche → Chartres |
| June | +1.9 | 5% | 10% | either |
| July | +4.6 | 2% | 15% | Mortagne-au-Perche → Chartres |
| August | +4.6 | 2% | 13% | Mortagne-au-Perche → Chartres |
| September | +2.0 | 5% | 11% | either |
| October | +1.5 | 6% | 12% | either |
| November | +3.0 | 4% | 16% | Mortagne-au-Perche → Chartres |
| December | +3.8 | 5% | 18% | Mortagne-au-Perche → Chartres |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 228–253 | SE | +2.1 |
| 253–278 | SE | +1.1 |
| 278–304 | E | +2.4 |
| 304–330 | NE | +2.2 |
| 330–342 | NE | +2.1 |
Other stages
- near Pontorson → Domfront 98 km
- Domfront → Mortagne-au-Perche 113 km
- Mortagne-au-Perche → Chartres 114 km
- Chartres → Antony 112 km
- Antony → Paris 72 km
How to read the numbers
Wind is the 10 m wind of a 25-km grid cell, daytime hours 9:00–18:00 local solar time; at saddle height in a sheltered valley it is weaker, on a coast or ridge stronger. A positive value is a tailwind. ERA5 slightly over-counts days with ≥ 1 mm of rain (by about 5–7 percentage points) and underestimates daily highs by 1–2 °C. Good day = less than 1 mm of rain between 9:00 and 18:00 (riding hours, local solar time) and a high between 10 and 30 °C; rain at night or in the evening does not spoil it.