Mittelland-Route (Aachen – Zittau), stage 3: Siegen → Stadtallendorf
On stage 3 (Siegen → Stadtallendorf, 110 km) the best month is September: 76% of days were dry with highs of 10–30 °C, and riding Siegen → Stadtallendorf meant an average tailwind of 2.9 km/h (ERA5 2006–2025, 9:00–18:00).
← Mittelland-Route (Aachen – Zittau) (Whole route)
Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 2% | 29% | 87 | 3 °C | 0% | 96% | 8.4 † |
| February | 7% | 26% | 68 | 4 °C | 0% | 91% | 9.9 † |
| March | 30% | 29% | 66 | 8 °C | 0% | 64% | 11.7 |
| April | 58% | 27% | 56 | 13 °C | 0% | 29% | 13.8 |
| May | 65% | 32% | 78 | 17 °C | 0% | 6% | 15.5 |
| June | 69% | 29% | 79 | 21 °C | 2% | 0% | 16.5 |
| July | 62% | 32% | 85 | 22 °C | 7% | 0% | 16.1 |
| August | 65% | 31% | 86 | 22 °C | 5% | 0% | 14.5 |
| September | 76% | 24% | 68 | 18 °C | 0% | 1% | 12.5 |
| October | 57% | 26% | 69 | 13 °C | 0% | 25% | 10.6 † |
| November | 18% | 28% | 71 | 7 °C | 0% | 76% | 8.8 † |
| December | 3% | 31% | 85 | 4 °C | 0% | 94% | 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 Siegen → Stadtallendorf, km/h | Headwind > 15 km/h, Siegen → Stadtallendorf | Headwind > 15 km/h, Stadtallendorf → Siegen | Better way |
|---|---|---|---|---|
| January | +4.8 | 2% | 18% | Siegen → Stadtallendorf |
| February | +3.0 | 3% | 15% | Siegen → Stadtallendorf |
| March | +2.6 | 5% | 14% | Siegen → Stadtallendorf |
| April | +1.3 | 5% | 9% | either |
| May | +2.0 | 3% | 11% | either |
| June | +3.3 | 1% | 10% | Siegen → Stadtallendorf |
| July | +5.6 | 0% | 13% | Siegen → Stadtallendorf |
| August | +4.6 | 0% | 10% | Siegen → Stadtallendorf |
| September | +2.9 | 2% | 9% | Siegen → Stadtallendorf |
| October | +2.9 | 1% | 11% | Siegen → Stadtallendorf |
| November | +3.3 | 1% | 12% | Siegen → Stadtallendorf |
| December | +4.3 | 2% | 14% | Siegen → Stadtallendorf |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 266–291 | NE | +4.2 |
| 291–317 | E | +3.5 |
| 317–343 | SE | +1.6 |
| 343–369 | E | +2.1 |
| 369–376 | E | +3.2 |
Other stages
- Aachen → Bonn 137 km
- Bonn → Siegen 131 km
- Siegen → Stadtallendorf 110 km
- Stadtallendorf → Heringen 116 km
- Heringen → Erfurt 118 km
- Erfurt → Gera 115 km
- Gera → Freiberg 124 km
- Freiberg → Neustadt in Sachsen 115 km
- Neustadt in Sachsen → Zittau 72 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.