Aida: which way and when to ride
The best month for Aida is October: 76% of days were dry with highs of 10–30 °C. In October the wind barely favours either direction — on average 1.5 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 | 16% | 15% | 70 | 7 °C | 0% | 82% | 9.1 † |
| February | 41% | 19% | 80 | 9 °C | 0% | 55% | 10.3 † |
| March | 65% | 22% | 93 | 13 °C | 0% | 23% | 11.8 |
| April | 68% | 28% | 100 | 17 °C | 0% | 8% | 13.5 |
| May | 62% | 35% | 141 | 21 °C | 2% | 4% | 14.9 |
| June | 50% | 32% | 104 | 26 °C | 19% | 1% | 15.7 |
| July | 41% | 26% | 93 | 28 °C | 37% | 0% | 15.3 |
| August | 45% | 26% | 105 | 28 °C | 32% | 0% | 14.1 |
| September | 73% | 24% | 119 | 23 °C | 2% | 1% | 12.5 |
| October | 76% | 21% | 116 | 18 °C | 0% | 5% | 10.8 † |
| November | 57% | 22% | 138 | 12 °C | 0% | 27% | 9.4 † |
| December | 20% | 16% | 82 | 7 °C | 0% | 77% | 8.7 † |
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 → Treviso, km/h | Headwind > 15 km/h, Susa → Treviso | Headwind > 15 km/h, Treviso → Susa | Better way |
|---|---|---|---|---|
| January | −0.3 | 1% | 0% | either |
| February | −0.8 | 1% | 0% | either |
| March | −1.0 | 2% | 0% | either |
| April | −1.3 | 2% | 0% | either |
| May | −0.7 | 1% | 0% | either |
| June | −0.3 | 0% | 0% | either |
| July | −0.7 | 0% | 0% | either |
| August | −1.2 | 0% | 0% | either |
| September | −1.6 | 1% | 0% | either |
| October | −1.5 | 1% | 0% | either |
| November | −1.0 | 1% | 0% | either |
| December | −0.1 | 1% | 0% | either |
Stages
The route is split into 9 stages of about 100–150 km between towns; each stage has its own page.
| Stage | km | Best month | Tailwind Susa → Treviso in October, km/h |
|---|---|---|---|
| 1. Susa → Turin | 114 | September | −1.4 |
| 2. Turin → Novara | 122 | October | −2.7 |
| 3. Novara → Treviglio | 123 | October | −1.5 |
| 4. Treviglio → Verona | 148 | October | −0.4 |
| 5. Verona → Padua | 124 | October | −1.4 |
| 6. Padua → Oderzo | 122 | October | −2.0 |
| 7. Oderzo → Udine | 114 | October | −1.4 |
| 8. Udine → Cormons | 80 | October | −1.6 |
| 9. Cormons → Treviso | 7 | October | +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.