Frontroute 14-18: which way and when to ride
The best month for Frontroute 14-18 is September: 79% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 0.5 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 | 12% | 24% | 63 | 7 °C | 0% | 79% | 8.4 † |
| February | 23% | 25% | 53 | 8 °C | 0% | 67% | 9.9 † |
| March | 49% | 22% | 56 | 11 °C | 0% | 41% | 11.7 |
| April | 69% | 21% | 41 | 14 °C | 0% | 14% | 13.8 |
| May | 75% | 24% | 61 | 17 °C | 0% | 2% | 15.5 |
| June | 77% | 21% | 58 | 20 °C | 1% | 0% | 16.5 |
| July | 75% | 22% | 60 | 22 °C | 3% | 0% | 16.1 |
| August | 72% | 24% | 68 | 22 °C | 4% | 0% | 14.5 |
| September | 79% | 20% | 53 | 20 °C | 1% | 0% | 12.5 |
| October | 74% | 23% | 71 | 16 °C | 0% | 4% | 10.6 † |
| November | 44% | 27% | 67 | 11 °C | 0% | 38% | 8.8 † |
| December | 20% | 23% | 69 | 8 °C | 0% | 69% | 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 Nieuwpoort → Mesen, km/h | Headwind > 15 km/h, Nieuwpoort → Mesen | Headwind > 15 km/h, Mesen → Nieuwpoort | Better way |
|---|---|---|---|---|
| January | −3.5 | 18% | 6% | Mesen → Nieuwpoort |
| February | −2.9 | 18% | 7% | Mesen → Nieuwpoort |
| March | −0.1 | 12% | 10% | either |
| April | +1.8 | 9% | 11% | either |
| May | +2.5 | 7% | 13% | Nieuwpoort → Mesen |
| June | +2.1 | 5% | 10% | Nieuwpoort → Mesen |
| July | +0.8 | 6% | 7% | either |
| August | −0.1 | 7% | 7% | either |
| September | −0.5 | 9% | 8% | either |
| October | −3.8 | 17% | 5% | Mesen → Nieuwpoort |
| November | −4.6 | 21% | 6% | Mesen → Nieuwpoort |
| December | −4.9 | 21% | 5% | Mesen → Nieuwpoort |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–2 | N | +1.3 |
| 2–27 | SE | +1.1 |
| 27–53 | SE | +0.8 |
| 53–78 | S | −2.0 |
| 78–101 | S | −2.3 |
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.