La Cyclo Bohème: which way and when to ride
The best month for La Cyclo Bohème is September: 75% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 1.6 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 | 21% | 23% | 66 | 7 °C | 0% | 69% | 8.9 † |
| February | 37% | 24% | 53 | 9 °C | 0% | 52% | 10.2 † |
| March | 56% | 28% | 66 | 13 °C | 0% | 26% | 11.8 |
| April | 73% | 25% | 59 | 17 °C | 0% | 5% | 13.5 |
| May | 70% | 29% | 79 | 20 °C | 1% | 1% | 15.0 |
| June | 65% | 25% | 69 | 24 °C | 11% | 0% | 15.8 |
| July | 66% | 17% | 48 | 26 °C | 19% | 0% | 15.5 |
| August | 67% | 15% | 45 | 26 °C | 19% | 0% | 14.2 |
| September | 75% | 18% | 55 | 22 °C | 7% | 0% | 12.5 |
| October | 75% | 23% | 77 | 18 °C | 0% | 3% | 10.8 † |
| November | 49% | 27% | 69 | 12 °C | 0% | 31% | 9.3 † |
| December | 26% | 24% | 71 | 8 °C | 0% | 61% | 8.6 † |
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 Bréhémont → Chambon-sur-Voueize, km/h | Headwind > 15 km/h, Bréhémont → Chambon-sur-Voueize | Headwind > 15 km/h, Chambon-sur-Voueize → Bréhémont | Better way |
|---|---|---|---|---|
| January | +1.3 | 3% | 7% | either |
| February | +1.5 | 3% | 8% | either |
| March | +1.8 | 3% | 9% | either |
| April | +1.2 | 3% | 5% | either |
| May | +2.8 | 2% | 7% | Bréhémont → Chambon-sur-Voueize |
| June | +2.5 | 1% | 4% | Bréhémont → Chambon-sur-Voueize |
| July | +4.0 | 1% | 6% | Bréhémont → Chambon-sur-Voueize |
| August | +3.7 | 1% | 5% | Bréhémont → Chambon-sur-Voueize |
| September | +1.6 | 1% | 4% | either |
| October | −0.2 | 3% | 4% | either |
| November | +0.6 | 3% | 5% | either |
| December | +0.8 | 3% | 7% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | E | +1.8 |
| 25–50 | E | +1.9 |
| 50–76 | SE | +1.3 |
| 76–101 | SE | +1.6 |
| 101–126 | SE | +1.8 |
| 126–151 | SE | +1.9 |
| 151–177 | SE | +1.9 |
| 177–202 | SE | +2.0 |
| 202–227 | S | +1.1 |
| 227–252 | SE | +2.2 |
| 252–277 | S | −0.2 |
| 277–305 | SE | +2.1 |
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.