Hærvejsruten, stage 1: Frederikshavn → Svenstrup
On stage 1 (Frederikshavn → Svenstrup, 102 km) the best month is September: 77% of days were dry with highs of 10–30 °C, and riding Svenstrup → Frederikshavn meant an average tailwind of 5.7 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 | 4 °C | 0% | 100% | 7.3 † |
| February | 1% | 21% | 50 | 3 °C | 0% | 99% | 9.4 † |
| March | 7% | 20% | 45 | 6 °C | 0% | 93% | 11.6 |
| April | 39% | 19% | 42 | 10 °C | 0% | 56% | 14.2 |
| May | 71% | 23% | 55 | 14 °C | 0% | 9% | 16.5 |
| June | 76% | 24% | 67 | 18 °C | 0% | 0% | 17.9 |
| July | 70% | 30% | 83 | 20 °C | 0% | 0% | 17.3 |
| August | 70% | 30% | 86 | 19 °C | 0% | 0% | 15.2 |
| September | 77% | 23% | 64 | 16 °C | 0% | 0% | 12.7 |
| October | 60% | 27% | 85 | 12 °C | 0% | 17% | 10.2 † |
| November | 16% | 25% | 64 | 8 °C | 0% | 76% | 7.9 † |
| December | 2% | 25% | 66 | 5 °C | 0% | 97% | 6.7 † |
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 Frederikshavn → Svenstrup, km/h | Headwind > 15 km/h, Frederikshavn → Svenstrup | Headwind > 15 km/h, Svenstrup → Frederikshavn | Better way |
|---|---|---|---|---|
| January | −6.4 | 32% | 11% | Svenstrup → Frederikshavn |
| February | −5.2 | 28% | 12% | Svenstrup → Frederikshavn |
| March | −3.7 | 24% | 11% | Svenstrup → Frederikshavn |
| April | −1.9 | 17% | 11% | either |
| May | −2.5 | 18% | 9% | Svenstrup → Frederikshavn |
| June | −5.2 | 22% | 4% | Svenstrup → Frederikshavn |
| July | −6.2 | 23% | 4% | Svenstrup → Frederikshavn |
| August | −6.5 | 25% | 5% | Svenstrup → Frederikshavn |
| September | −5.7 | 28% | 8% | Svenstrup → Frederikshavn |
| October | −6.1 | 31% | 10% | Svenstrup → Frederikshavn |
| November | −5.4 | 30% | 12% | Svenstrup → Frederikshavn |
| December | −7.6 | 35% | 9% | Svenstrup → Frederikshavn |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | SW | −6.2 |
| 25–50 | S | −5.1 |
| 50–76 | SW | −6.5 |
| 76–102 | SW | −5.0 |
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.