Hærvejsruten, stage 3: Viborg → Vejen
On stage 3 (Viborg → Vejen, 135 km) the best month is September: 73% of days were dry with highs of 10–30 °C, and riding Vejen → Viborg meant an average tailwind of 3.7 km/h (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 | 0% | 24% | 66 | 3 °C | 0% | 99% | 7.6 † |
| February | 2% | 23% | 52 | 4 °C | 0% | 97% | 9.5 † |
| March | 16% | 22% | 48 | 7 °C | 0% | 83% | 11.6 |
| April | 49% | 25% | 47 | 11 °C | 0% | 41% | 14.1 |
| May | 67% | 29% | 64 | 15 °C | 0% | 7% | 16.3 |
| June | 72% | 28% | 75 | 19 °C | 0% | 0% | 17.6 |
| July | 65% | 35% | 94 | 20 °C | 0% | 0% | 17.0 |
| August | 65% | 35% | 90 | 20 °C | 0% | 0% | 15.1 |
| September | 73% | 27% | 70 | 17 °C | 0% | 0% | 12.6 |
| October | 60% | 28% | 77 | 12 °C | 0% | 16% | 10.3 † |
| November | 18% | 24% | 58 | 8 °C | 0% | 74% | 8.1 † |
| December | 3% | 22% | 67 | 5 °C | 0% | 95% | 7.0 † |
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 Viborg → Vejen, km/h | Headwind > 15 km/h, Viborg → Vejen | Headwind > 15 km/h, Vejen → Viborg | Better way |
|---|---|---|---|---|
| January | −4.7 | 20% | 5% | Vejen → Viborg |
| February | −4.0 | 18% | 6% | Vejen → Viborg |
| March | −2.2 | 15% | 7% | Vejen → Viborg |
| April | −0.6 | 10% | 7% | either |
| May | −1.0 | 10% | 6% | either |
| June | −2.0 | 10% | 3% | Vejen → Viborg |
| July | −3.1 | 10% | 3% | Vejen → Viborg |
| August | −4.3 | 14% | 3% | Vejen → Viborg |
| September | −3.7 | 15% | 4% | Vejen → Viborg |
| October | −4.8 | 19% | 5% | Vejen → Viborg |
| November | −4.6 | 19% | 4% | Vejen → Viborg |
| December | −5.5 | 21% | 4% | Vejen → Viborg |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 204–229 | S | −4.2 |
| 229–255 | SE | −1.1 |
| 255–280 | S | −4.3 |
| 280–305 | S | −3.8 |
| 305–331 | SW | −5.2 |
| 331–339 | S | −3.1 |
Other stages
- Frederikshavn → Svenstrup 102 km
- Svenstrup → Viborg 102 km
- Viborg → Vejen 135 km
- Vejen → Padborg 108 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.