Østkystruten, stage 6: Haderslev → Sønderborg
On stage 6 (Haderslev → Sønderborg, 68 km) the best month is September: 75% of days were dry with highs of 10–30 °C; the wind barely favours either direction (0.5 km/h on average; ERA5 2006–2025, 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 | 1% | 24% | 65 | 4 °C | 0% | 98% | 7.7 † |
| February | 3% | 21% | 51 | 4 °C | 0% | 96% | 9.6 † |
| March | 17% | 19% | 44 | 7 °C | 0% | 81% | 11.7 |
| April | 53% | 22% | 45 | 11 °C | 0% | 39% | 14.0 |
| May | 74% | 23% | 61 | 16 °C | 0% | 5% | 16.1 |
| June | 75% | 25% | 70 | 19 °C | 0% | 0% | 17.3 |
| July | 68% | 31% | 81 | 21 °C | 1% | 0% | 16.8 |
| August | 69% | 31% | 80 | 21 °C | 0% | 0% | 14.9 |
| September | 75% | 25% | 64 | 18 °C | 0% | 0% | 12.6 |
| October | 64% | 26% | 73 | 13 °C | 0% | 12% | 10.3 † |
| November | 22% | 23% | 58 | 8 °C | 0% | 69% | 8.3 † |
| December | 4% | 23% | 66 | 5 °C | 0% | 93% | 7.2 † |
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 Haderslev → Sønderborg, km/h | Headwind > 15 km/h, Haderslev → Sønderborg | Headwind > 15 km/h, Sønderborg → Haderslev | Better way |
|---|---|---|---|---|
| January | −0.6 | 16% | 12% | either |
| February | −0.9 | 16% | 13% | either |
| March | +0.6 | 14% | 14% | either |
| April | +0.9 | 11% | 14% | either |
| May | +1.1 | 12% | 15% | either |
| June | +2.1 | 9% | 16% | Haderslev → Sønderborg |
| July | +2.0 | 8% | 15% | Haderslev → Sønderborg |
| August | +0.3 | 10% | 11% | either |
| September | −0.5 | 13% | 12% | either |
| October | −2.0 | 16% | 11% | Sønderborg → Haderslev |
| November | −2.2 | 16% | 10% | Sønderborg → Haderslev |
| December | −1.3 | 15% | 10% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 594–619 | S | −3.9 |
| 619–644 | SE | +2.2 |
| 644–662 | SE | +0.5 |
Other stages
- near Skagen → Hals 96 km
- Hals → Grenaa 139 km
- Grenaa → Horsens 148 km
- Horsens → Fredericia 117 km
- Fredericia → Haderslev 100 km
- Haderslev → Sønderborg 68 km
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.