Radweg D11: Ostsee – Oberbayern: which way and when to ride
The best month for Radweg D11: Ostsee – Oberbayern is September: 78% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 0.5 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 | 4% | 25% | 65 | 3 °C | 0% | 94% | 8.4 † |
| February | 11% | 21% | 48 | 5 °C | 0% | 86% | 9.9 † |
| March | 34% | 24% | 52 | 9 °C | 0% | 60% | 11.7 |
| April | 63% | 24% | 48 | 14 °C | 0% | 24% | 13.8 |
| May | 69% | 29% | 81 | 18 °C | 0% | 5% | 15.5 |
| June | 68% | 28% | 79 | 22 °C | 5% | 0% | 16.5 |
| July | 62% | 29% | 90 | 24 °C | 10% | 0% | 16.1 |
| August | 65% | 27% | 85 | 23 °C | 9% | 0% | 14.5 |
| September | 78% | 21% | 66 | 19 °C | 1% | 1% | 12.5 |
| October | 66% | 21% | 60 | 14 °C | 0% | 20% | 10.6 † |
| November | 25% | 20% | 55 | 8 °C | 0% | 70% | 8.8 † |
| December | 5% | 24% | 63 | 4 °C | 0% | 92% | 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 Warnemünde → Freilassing, km/h | Headwind > 15 km/h, Warnemünde → Freilassing | Headwind > 15 km/h, Freilassing → Warnemünde | Better way |
|---|---|---|---|---|
| January | −2.1 | 11% | 5% | Freilassing → Warnemünde |
| February | −1.5 | 9% | 5% | either |
| March | −0.2 | 8% | 6% | either |
| April | +0.9 | 4% | 6% | either |
| May | +0.9 | 5% | 5% | either |
| June | +0.8 | 4% | 4% | either |
| July | +0.2 | 4% | 3% | either |
| August | −0.6 | 4% | 2% | either |
| September | −0.5 | 5% | 3% | either |
| October | −1.9 | 7% | 3% | either |
| November | −2.6 | 8% | 3% | Freilassing → Warnemünde |
| December | −3.0 | 11% | 3% | Freilassing → Warnemünde |
Stages
The route is split into 13 stages of about 100–150 km between towns; each stage has its own page.
| Stage | km | Best month | Tailwind Warnemünde → Freilassing in September, km/h |
|---|---|---|---|
| 1. Warnemünde → Waren | 142 | September | −0.3 |
| 2. Waren → Zehdenick | 138 | September | +0.5 |
| 3. Zehdenick → Potsdam | 122 | September | −2.1 |
| 4. Potsdam → Gräfenhainichen | 124 | September | −2.4 |
| 5. Gräfenhainichen → Halle (Saale) | 142 | September | −1.8 |
| 6. Halle (Saale) → Jena | 114 | September | −1.9 |
| 7. Jena → Rosenthal | 137 | September | −0.1 |
| 8. Rosenthal → Lichtenfels | 134 | September | −1.5 |
| 9. Lichtenfels → Nuremberg | 117 | September | −0.5 |
| 10. Nuremberg → Kelheim | 128 | September | +1.2 |
| 11. Kelheim → Freising | 127 | September | +0.4 |
| 12. Freising → Rosenheim | 105 | September | +1.1 |
| 13. Rosenheim → Freilassing | 90 | September | +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.