EuroVelo 4 - Central Europe Route - part Germany, stage 2: Köln → Koblenz
On stage 2 (Köln → Koblenz, 109 km) the best month is September: 80% of days were dry with highs of 10–30 °C; the wind barely favours either direction (0.1 km/h on average; ERA5 2006–2025, 9:00–18:00).
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Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 6% | 27% | 69 | 5 °C | 0% | 89% | 8.4 † |
| February | 14% | 25% | 54 | 6 °C | 0% | 80% | 10.0 † |
| March | 39% | 26% | 58 | 10 °C | 0% | 53% | 11.7 |
| April | 65% | 22% | 46 | 14 °C | 0% | 21% | 13.7 |
| May | 69% | 30% | 75 | 18 °C | 0% | 3% | 15.5 |
| June | 68% | 29% | 75 | 22 °C | 4% | 0% | 16.4 |
| July | 63% | 28% | 79 | 24 °C | 10% | 0% | 16.0 |
| August | 64% | 29% | 83 | 23 °C | 8% | 0% | 14.5 |
| September | 80% | 19% | 60 | 19 °C | 1% | 0% | 12.5 |
| October | 67% | 23% | 65 | 14 °C | 0% | 14% | 10.6 † |
| November | 28% | 27% | 64 | 9 °C | 0% | 61% | 8.9 † |
| December | 8% | 27% | 75 | 6 °C | 0% | 85% | 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 Köln → Koblenz, km/h | Headwind > 15 km/h, Köln → Koblenz | Headwind > 15 km/h, Koblenz → Köln | Better way |
|---|---|---|---|---|
| January | −1.6 | 9% | 5% | either |
| February | −2.1 | 9% | 4% | Koblenz → Köln |
| March | +0.3 | 7% | 7% | either |
| April | +1.6 | 4% | 6% | either |
| May | +2.1 | 2% | 6% | Köln → Koblenz |
| June | +2.8 | 1% | 5% | Köln → Koblenz |
| July | +2.9 | 1% | 4% | Köln → Koblenz |
| August | +1.2 | 2% | 3% | either |
| September | +0.1 | 3% | 3% | either |
| October | −2.7 | 9% | 3% | Koblenz → Köln |
| November | −3.6 | 10% | 4% | Koblenz → Köln |
| December | −3.1 | 10% | 4% | Koblenz → Köln |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 104–129 | S | −0.4 |
| 129–154 | SE | +0.5 |
| 154–180 | SE | −0.2 |
| 180–205 | SE | +1.3 |
| 205–213 | S | −1.9 |
Other stages
- Venlo → Köln 104 km
- Köln → Koblenz 109 km
- Koblenz → Frankfurt am Main 133 km
- Frankfurt am Main → Wertheim 126 km
- Wertheim → Würzburg 104 km
- Würzburg → Haßfurt 114 km
- Haßfurt → Kulmbach 112 km
- Kulmbach → Hohenberg an der Eger 107 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.