Green Velo - 03 Północne Mazury: which way and when to ride
The best month for Green Velo - 03 Północne Mazury is September: 80% of days were dry with highs of 10–30 °C. In September, riding Sępopol → Wiżajny 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 | 0% | 24% | 54 | 0 °C | 0% | 99% | 7.9 † |
| February | 1% | 19% | 41 | 1 °C | 0% | 99% | 9.7 † |
| March | 18% | 20% | 39 | 6 °C | 0% | 79% | 11.7 |
| April | 55% | 21% | 39 | 12 °C | 0% | 36% | 14.0 |
| May | 70% | 27% | 63 | 17 °C | 0% | 5% | 16.0 |
| June | 70% | 28% | 71 | 21 °C | 2% | 0% | 17.2 |
| July | 63% | 34% | 100 | 23 °C | 4% | 0% | 16.7 |
| August | 67% | 30% | 82 | 23 °C | 4% | 0% | 14.9 |
| September | 80% | 19% | 50 | 18 °C | 0% | 2% | 12.6 |
| October | 51% | 23% | 55 | 11 °C | 0% | 37% | 10.4 † |
| November | 9% | 20% | 47 | 6 °C | 0% | 88% | 8.4 † |
| December | 1% | 20% | 49 | 2 °C | 0% | 99% | 7.3 † |
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 Sępopol → Wiżajny, km/h | Headwind > 15 km/h, Sępopol → Wiżajny | Headwind > 15 km/h, Wiżajny → Sępopol | Better way |
|---|---|---|---|---|
| January | +4.2 | 5% | 18% | Sępopol → Wiżajny |
| February | +3.5 | 4% | 17% | Sępopol → Wiżajny |
| March | +3.7 | 6% | 16% | Sępopol → Wiżajny |
| April | +3.1 | 4% | 15% | Sępopol → Wiżajny |
| May | +1.4 | 5% | 9% | either |
| June | +3.4 | 3% | 12% | Sępopol → Wiżajny |
| July | +4.3 | 2% | 13% | Sępopol → Wiżajny |
| August | +3.4 | 1% | 11% | Sępopol → Wiżajny |
| September | +2.6 | 4% | 14% | Sępopol → Wiżajny |
| October | +3.8 | 5% | 18% | Sępopol → Wiżajny |
| November | +3.6 | 4% | 16% | Sępopol → Wiżajny |
| December | +5.1 | 3% | 19% | Sępopol → Wiżajny |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | E | +2.1 |
| 25–50 | E | +2.4 |
| 50–76 | E | +2.6 |
| 76–101 | NE | +2.9 |
| 101–126 | E | +2.2 |
| 126–151 | NE | +3.1 |
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.