Véloroute Loing - Loire - Berry: which way and when to ride
The best month for Véloroute Loing - Loire - Berry is September: 77% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 0.2 km/h along the route (ERA5 2006–2025, daytime 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 | 15% | 25% | 70 | 7 °C | 0% | 75% | 8.8 † |
| February | 31% | 25% | 56 | 9 °C | 0% | 57% | 10.2 † |
| March | 54% | 28% | 68 | 12 °C | 0% | 29% | 11.8 |
| April | 74% | 23% | 55 | 16 °C | 0% | 6% | 13.6 |
| May | 70% | 29% | 79 | 19 °C | 1% | 1% | 15.1 |
| June | 69% | 22% | 64 | 24 °C | 10% | 0% | 15.9 |
| July | 66% | 18% | 52 | 26 °C | 18% | 0% | 15.6 |
| August | 68% | 16% | 51 | 25 °C | 17% | 0% | 14.2 |
| September | 77% | 18% | 58 | 22 °C | 5% | 0% | 12.5 |
| October | 74% | 23% | 78 | 17 °C | 0% | 3% | 10.8 † |
| November | 45% | 26% | 68 | 11 °C | 0% | 37% | 9.2 † |
| December | 20% | 25% | 80 | 8 °C | 0% | 66% | 8.4 † |
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 Chalette-sur-Loing → Bourges, km/h | Headwind > 15 km/h, Chalette-sur-Loing → Bourges | Headwind > 15 km/h, Bourges → Chalette-sur-Loing | Better way |
|---|---|---|---|---|
| January | −3.1 | 14% | 4% | Bourges → Chalette-sur-Loing |
| February | −2.3 | 13% | 6% | Bourges → Chalette-sur-Loing |
| March | −0.6 | 10% | 7% | either |
| April | +0.9 | 7% | 7% | either |
| May | +0.9 | 5% | 7% | either |
| June | +0.6 | 4% | 4% | either |
| July | −0.6 | 5% | 2% | either |
| August | −0.9 | 4% | 2% | either |
| September | −0.2 | 6% | 4% | either |
| October | −2.4 | 10% | 3% | Bourges → Chalette-sur-Loing |
| November | −3.9 | 13% | 3% | Bourges → Chalette-sur-Loing |
| December | −4.1 | 14% | 3% | Bourges → Chalette-sur-Loing |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–26 | S | +0.6 |
| 26–51 | S | −0.2 |
| 51–72 | W | −1.9 |
| 72–82 | S | −0.2 |
| 82–108 | S | +0.6 |
| 108–128 | S | −0.5 |
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.