ViaRhôna, stage 4: Vienne → Le Pouzin
On stage 4 (Vienne → Le Pouzin, 128 km) the best month is October: 77% of days were dry with highs of 10–30 °C; the wind barely favours either direction (0.9 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 | 21% | 21% | 66 | 7 °C | 0% | 74% | 9.1 † |
| February | 41% | 19% | 57 | 9 °C | 0% | 51% | 10.3 † |
| March | 62% | 22% | 71 | 13 °C | 0% | 23% | 11.8 |
| April | 72% | 25% | 72 | 17 °C | 0% | 5% | 13.4 |
| May | 69% | 30% | 98 | 20 °C | 1% | 1% | 14.8 |
| June | 62% | 24% | 69 | 25 °C | 15% | 0% | 15.6 |
| July | 50% | 20% | 67 | 28 °C | 35% | 0% | 15.3 |
| August | 54% | 17% | 61 | 27 °C | 32% | 0% | 14.1 |
| September | 77% | 18% | 83 | 23 °C | 5% | 0% | 12.4 |
| October | 77% | 20% | 99 | 18 °C | 0% | 4% | 10.9 † |
| November | 48% | 26% | 110 | 12 °C | 0% | 35% | 9.5 † |
| December | 26% | 24% | 73 | 8 °C | 0% | 66% | 8.8 † |
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 Vienne → Le Pouzin, km/h | Headwind > 15 km/h, Vienne → Le Pouzin | Headwind > 15 km/h, Le Pouzin → Vienne | Better way |
|---|---|---|---|---|
| January | +3.7 | 7% | 20% | Vienne → Le Pouzin |
| February | +3.3 | 10% | 23% | Vienne → Le Pouzin |
| March | +3.2 | 12% | 22% | Vienne → Le Pouzin |
| April | +2.7 | 14% | 22% | Vienne → Le Pouzin |
| May | +3.3 | 12% | 24% | Vienne → Le Pouzin |
| June | +2.9 | 10% | 20% | Vienne → Le Pouzin |
| July | +5.0 | 8% | 21% | Vienne → Le Pouzin |
| August | +4.2 | 8% | 21% | Vienne → Le Pouzin |
| September | +3.4 | 8% | 19% | Vienne → Le Pouzin |
| October | +0.9 | 14% | 17% | either |
| November | +1.5 | 11% | 16% | either |
| December | +1.9 | 8% | 15% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in October, km/h |
|---|---|---|
| 360–386 | S | −0.8 |
| 386–412 | S | −0.3 |
| 412–437 | S | +1.1 |
| 437–462 | S | +1.7 |
| 462–488 | SW | +2.6 |
Other stages
- Saint-Gingolph → Valleiry 106 km
- Valleiry → Montalieu 132 km
- Montalieu → Vienne 122 km
- Vienne → Le Pouzin 128 km
- Le Pouzin → Avignon 123 km
- Avignon → Sète 154 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.