Aida, stage 1: Susa → Turin
On stage 1 (Susa → Turin, 114 km) the best month is September: 60% of days were dry with highs of 10–30 °C, and riding Turin → Susa meant an average tailwind of 2.0 km/h (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 | 8% | 18% | 72 | 1 °C | 0% | 92% | 9.1 † |
| February | 16% | 19% | 66 | 3 °C | 0% | 83% | 10.3 † |
| March | 29% | 25% | 103 | 6 °C | 0% | 68% | 11.8 |
| April | 36% | 34% | 119 | 10 °C | 0% | 51% | 13.4 |
| May | 39% | 47% | 159 | 14 °C | 0% | 32% | 14.8 |
| June | 41% | 54% | 142 | 19 °C | 4% | 7% | 15.6 |
| July | 44% | 47% | 123 | 22 °C | 9% | 1% | 15.3 |
| August | 49% | 43% | 112 | 21 °C | 8% | 2% | 14.1 |
| September | 60% | 35% | 101 | 17 °C | 1% | 11% | 12.4 |
| October | 54% | 24% | 100 | 12 °C | 0% | 36% | 10.9 † |
| November | 26% | 23% | 134 | 6 °C | 0% | 71% | 9.5 † |
| December | 9% | 18% | 83 | 2 °C | 0% | 91% | 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 Susa → Turin, km/h | Headwind > 15 km/h, Susa → Turin | Headwind > 15 km/h, Turin → Susa | Better way |
|---|---|---|---|---|
| January | +1.9 | 0% | 0% | either |
| February | +0.5 | 0% | 0% | either |
| March | −0.5 | 0% | 0% | either |
| April | −1.8 | 0% | 0% | either |
| May | −1.8 | 0% | 0% | either |
| June | −2.0 | 0% | 0% | Turin → Susa |
| July | −1.5 | 0% | 0% | either |
| August | −1.8 | 0% | 0% | either |
| September | −2.0 | 0% | 0% | Turin → Susa |
| October | −1.4 | 0% | 0% | either |
| November | +0.5 | 0% | 0% | either |
| December | +2.3 | 0% | 0% | Susa → Turin |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–26 | SE | −0.7 |
| 26–51 | SE | −0.4 |
| 51–76 | SE | −3.7 |
| 76–101 | E | −3.5 |
| 101–114 | NE | −1.7 |
Other stages
- Susa → Turin 114 km
- Turin → Novara 122 km
- Novara → Treviglio 123 km
- Treviglio → Verona 148 km
- Verona → Padua 124 km
- Padua → Oderzo 122 km
- Oderzo → Udine 114 km
- Udine → Cormons 80 km
- Cormons → Treviso 7 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.