Radweg Deutsche Einheit: which way and when to ride
The best month for Radweg Deutsche Einheit is September: 79% of days were dry with highs of 10–30 °C. In September, riding Bonn → Berlin meant an average tailwind of 2.6 km/h (ERA5 2006–2025, daytime 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 | 4% | 25% | 64 | 3 °C | 0% | 93% | 8.3 † |
| February | 10% | 23% | 50 | 5 °C | 0% | 86% | 9.9 † |
| March | 34% | 25% | 51 | 9 °C | 0% | 60% | 11.7 |
| April | 64% | 22% | 43 | 14 °C | 0% | 23% | 13.8 |
| May | 71% | 27% | 67 | 18 °C | 0% | 4% | 15.6 |
| June | 71% | 25% | 66 | 22 °C | 4% | 0% | 16.6 |
| July | 64% | 27% | 76 | 24 °C | 10% | 0% | 16.2 |
| August | 68% | 25% | 71 | 23 °C | 8% | 0% | 14.6 |
| September | 79% | 20% | 57 | 19 °C | 1% | 0% | 12.6 |
| October | 65% | 22% | 58 | 14 °C | 0% | 17% | 10.6 † |
| November | 24% | 22% | 55 | 8 °C | 0% | 69% | 8.8 † |
| December | 6% | 25% | 63 | 5 °C | 0% | 90% | 7.9 † |
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 → Berlin, km/h | Headwind > 15 km/h, Bonn → Berlin | Headwind > 15 km/h, Berlin → Bonn | Better way |
|---|---|---|---|---|
| January | +4.8 | 2% | 18% | Bonn → Berlin |
| February | +3.5 | 4% | 15% | Bonn → Berlin |
| March | +2.5 | 5% | 13% | Bonn → Berlin |
| April | +1.1 | 5% | 9% | either |
| May | +1.3 | 4% | 9% | either |
| June | +2.5 | 2% | 9% | Bonn → Berlin |
| July | +4.0 | 1% | 11% | Bonn → Berlin |
| August | +3.6 | 1% | 9% | Bonn → Berlin |
| September | +2.6 | 3% | 9% | Bonn → Berlin |
| October | +3.4 | 2% | 12% | Bonn → Berlin |
| November | +4.1 | 2% | 13% | Bonn → Berlin |
| December | +5.1 | 2% | 16% | Bonn → Berlin |
Stages
The route is split into 9 stages of about 100–150 km between towns; each stage has its own page.
| Stage | km | Best month | Tailwind Bonn → Berlin in September, km/h |
|---|---|---|---|
| 1. Bonn → Limburg an der Lahn | 136 | September | +1.3 |
| 2. Limburg an der Lahn → Marburg an der Lahn | 120 | September | +2.6 |
| 3. Marburg an der Lahn → Bad Hersfeld | 121 | September | +2.9 |
| 4. Bad Hersfeld → Hannoversch Münden | 116 | September | +1.7 |
| 5. Hannoversch Münden → Einbeck | 122 | September | +1.5 |
| 6. Einbeck → Blankenburg | 120 | September | +4.4 |
| 7. Blankenburg → Köthen | 130 | September | +3.5 |
| 8. Köthen → Bad Belzig | 124 | September | +2.5 |
| 9. Bad Belzig → Berlin | 100 | September | +3.2 |
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.