Radweg Deutsche Einheit, stage 1: Bonn → Limburg an der Lahn
On stage 1 (Bonn → Limburg an der Lahn, 136 km) the best month is September: 80% of days were dry with highs of 10–30 °C; the wind barely favours either direction (1.3 km/h on average; ERA5 2006–2025, 9:00–18:00).
← Radweg Deutsche Einheit (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 | 5% | 27% | 71 | 4 °C | 0% | 92% | 8.5 † |
| February | 12% | 24% | 54 | 6 °C | 0% | 84% | 10.0 † |
| March | 36% | 27% | 58 | 10 °C | 0% | 56% | 11.7 |
| April | 63% | 24% | 48 | 14 °C | 0% | 23% | 13.7 |
| May | 68% | 30% | 77 | 18 °C | 0% | 4% | 15.4 |
| June | 68% | 29% | 77 | 22 °C | 4% | 0% | 16.4 |
| July | 64% | 28% | 76 | 23 °C | 10% | 0% | 16.0 |
| August | 66% | 27% | 79 | 23 °C | 7% | 0% | 14.5 |
| September | 80% | 20% | 62 | 19 °C | 1% | 0% | 12.5 |
| October | 65% | 23% | 65 | 14 °C | 0% | 16% | 10.6 † |
| November | 23% | 26% | 63 | 8 °C | 0% | 67% | 8.9 † |
| December | 5% | 28% | 76 | 5 °C | 0% | 89% | 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 Bonn → Limburg an der Lahn, km/h | Headwind > 15 km/h, Bonn → Limburg an der Lahn | Headwind > 15 km/h, Limburg an der Lahn → Bonn | Better way |
|---|---|---|---|---|
| January | +1.5 | 4% | 11% | either |
| February | +0.3 | 6% | 9% | either |
| March | +1.4 | 6% | 11% | either |
| April | +1.3 | 4% | 7% | either |
| May | +2.0 | 2% | 8% | Bonn → Limburg an der Lahn |
| June | +2.9 | 1% | 7% | Bonn → Limburg an der Lahn |
| July | +4.1 | 1% | 8% | Bonn → Limburg an der Lahn |
| August | +2.8 | 1% | 6% | Bonn → Limburg an der Lahn |
| September | +1.3 | 2% | 6% | either |
| October | −0.3 | 5% | 6% | either |
| November | −0.3 | 5% | 7% | either |
| December | +0.5 | 5% | 9% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | S | −0.5 |
| 25–51 | SE | +0.6 |
| 51–76 | SE | +0.8 |
| 76–101 | E | +2.2 |
| 101–126 | E | +2.7 |
| 126–136 | NE | +2.5 |
Other stages
- Bonn → Limburg an der Lahn 136 km
- Limburg an der Lahn → Marburg an der Lahn 120 km
- Marburg an der Lahn → Bad Hersfeld 121 km
- Bad Hersfeld → Hannoversch Münden 116 km
- Hannoversch Münden → Einbeck 122 km
- Einbeck → Blankenburg 120 km
- Blankenburg → Köthen 130 km
- Köthen → Bad Belzig 124 km
- Bad Belzig → Berlin 100 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.