Avenue Verte London ↔ Paris: which way and when to ride
The best month for Avenue Verte London ↔ Paris is September: 79% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 0.9 km/h along the route (ERA5 2006–2025, daytime 9:00–18:00).
Also passes through France
Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 13% | 25% | 74 | 7 °C | 0% | 77% | 8.4 † |
| February | 20% | 25% | 62 | 8 °C | 0% | 71% | 10.0 † |
| March | 43% | 24% | 57 | 10 °C | 0% | 47% | 11.7 |
| April | 68% | 21% | 46 | 13 °C | 0% | 16% | 13.7 |
| May | 74% | 25% | 62 | 16 °C | 0% | 2% | 15.5 |
| June | 78% | 21% | 59 | 19 °C | 0% | 0% | 16.4 |
| July | 77% | 21% | 60 | 21 °C | 1% | 0% | 16.0 |
| August | 75% | 24% | 70 | 21 °C | 1% | 0% | 14.5 |
| September | 79% | 21% | 60 | 19 °C | 0% | 0% | 12.5 |
| October | 73% | 25% | 83 | 15 °C | 0% | 3% | 10.6 † |
| November | 45% | 29% | 89 | 11 °C | 0% | 34% | 8.9 † |
| December | 22% | 27% | 85 | 8 °C | 0% | 64% | 8.0 † |
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 London → Dieppe, km/h | Headwind > 15 km/h, London → Dieppe | Headwind > 15 km/h, Dieppe → London | Better way |
|---|---|---|---|---|
| January | −1.1 | 17% | 13% | either |
| February | −0.8 | 17% | 13% | either |
| March | +0.7 | 13% | 14% | either |
| April | +1.6 | 10% | 11% | either |
| May | +2.6 | 8% | 14% | London → Dieppe |
| June | +2.0 | 8% | 10% | London → Dieppe |
| July | +1.8 | 9% | 11% | either |
| August | +1.6 | 10% | 11% | either |
| September | +0.9 | 10% | 11% | either |
| October | −1.9 | 17% | 10% | either |
| November | −1.6 | 18% | 13% | either |
| December | −2.1 | 19% | 12% | Dieppe → London |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | S | −3.0 |
| 25–50 | S | −2.1 |
| 50–76 | SE | +2.4 |
| 76–101 | SE | +3.1 |
| 101–126 | S | −2.1 |
| 126–152 | SW | −5.8 |
| 152–273 | SE | +3.6 |
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.