Weser-Romantische Straße Teil 4: which way and when to ride
The best month for Weser-Romantische Straße Teil 4 is September: 78% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 1.1 km/h along the route (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 | 3% | 25% | 64 | 3 °C | 0% | 94% | 8.3 † |
| February | 9% | 25% | 53 | 5 °C | 0% | 88% | 9.9 † |
| March | 31% | 27% | 51 | 9 °C | 0% | 62% | 11.7 |
| April | 61% | 23% | 46 | 14 °C | 0% | 26% | 13.8 |
| May | 69% | 29% | 69 | 17 °C | 0% | 5% | 15.6 |
| June | 71% | 27% | 67 | 21 °C | 3% | 0% | 16.6 |
| July | 63% | 29% | 77 | 23 °C | 9% | 0% | 16.1 |
| August | 69% | 26% | 73 | 23 °C | 6% | 0% | 14.6 |
| September | 78% | 21% | 56 | 19 °C | 0% | 0% | 12.6 |
| October | 63% | 22% | 59 | 13 °C | 0% | 20% | 10.6 † |
| November | 23% | 23% | 55 | 8 °C | 0% | 72% | 8.8 † |
| December | 4% | 26% | 62 | 4 °C | 0% | 92% | 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 Beverungen → Rotenburg, km/h | Headwind > 15 km/h, Beverungen → Rotenburg | Headwind > 15 km/h, Rotenburg → Beverungen | Better way |
|---|---|---|---|---|
| January | −3.2 | 11% | 3% | Rotenburg → Beverungen |
| February | −3.1 | 10% | 3% | Rotenburg → Beverungen |
| March | −0.7 | 7% | 4% | either |
| April | +0.5 | 4% | 4% | either |
| May | +0.7 | 3% | 4% | either |
| June | +0.8 | 3% | 4% | either |
| July | +0.2 | 3% | 2% | either |
| August | −1.0 | 3% | 1% | either |
| September | −1.1 | 4% | 2% | either |
| October | −3.5 | 8% | 3% | Rotenburg → Beverungen |
| November | −4.4 | 10% | 2% | Rotenburg → Beverungen |
| December | −4.5 | 12% | 2% | Rotenburg → Beverungen |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | SE | +1.3 |
| 25–50 | S | −2.7 |
| 50–75 | SW | −3.4 |
| 75–101 | S | −1.4 |
| 101–126 | SE | −0.1 |
| 126–137 | SE | +0.8 |
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.