Avenue Verte London ↔ Paris, part France: which way and when to ride
The best month for Avenue Verte London ↔ Paris, part France is September: 79% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 1.3 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 | 13% | 24% | 65 | 7 °C | 0% | 79% | 8.6 † |
| February | 25% | 24% | 55 | 8 °C | 0% | 65% | 10.1 † |
| March | 49% | 27% | 60 | 11 °C | 0% | 37% | 11.7 |
| April | 69% | 25% | 49 | 15 °C | 0% | 10% | 13.7 |
| May | 70% | 29% | 67 | 18 °C | 0% | 1% | 15.3 |
| June | 73% | 24% | 63 | 22 °C | 3% | 0% | 16.2 |
| July | 73% | 21% | 54 | 24 °C | 8% | 0% | 15.8 |
| August | 71% | 23% | 62 | 23 °C | 7% | 0% | 14.4 |
| September | 79% | 19% | 48 | 20 °C | 2% | 0% | 12.5 |
| October | 74% | 23% | 72 | 16 °C | 0% | 3% | 10.7 † |
| November | 43% | 24% | 68 | 11 °C | 0% | 40% | 9.0 † |
| December | 18% | 25% | 77 | 8 °C | 0% | 70% | 8.2 † |
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 Dieppe → Paris, km/h | Headwind > 15 km/h, Dieppe → Paris | Headwind > 15 km/h, Paris → Dieppe | Better way |
|---|---|---|---|---|
| January | −0.3 | 10% | 9% | either |
| February | +0.1 | 10% | 10% | either |
| March | +1.0 | 8% | 11% | either |
| April | +1.3 | 6% | 8% | either |
| May | +2.9 | 4% | 11% | Dieppe → Paris |
| June | +2.4 | 3% | 7% | Dieppe → Paris |
| July | +3.2 | 3% | 9% | Dieppe → Paris |
| August | +2.7 | 3% | 8% | Dieppe → Paris |
| September | +1.3 | 4% | 7% | either |
| October | −1.2 | 9% | 6% | either |
| November | −1.5 | 11% | 7% | either |
| December | −1.1 | 11% | 8% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | SE | +2.6 |
| 25–50 | SE | +2.3 |
| 50–75 | SE | +1.5 |
| 75–100 | S | −0.4 |
| 100–126 | S | −0.2 |
| 126–151 | S | +0.7 |
| 151–177 | SE | +2.3 |
| 177–203 | S | +0.7 |
| 203–229 | E | +2.4 |
| 229–236 | SW | −1.3 |
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.