Green Velo - 02 Warmia i okolice: which way and when to ride
The best month for Green Velo - 02 Warmia i okolice is September: 80% of days were dry with highs of 10–30 °C. In September, riding near Braniewo → Sępopol meant an average tailwind of 2.1 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 | 1% | 23% | 54 | 0 °C | 0% | 99% | 7.9 † |
| February | 1% | 19% | 41 | 2 °C | 0% | 98% | 9.7 † |
| March | 19% | 22% | 41 | 7 °C | 0% | 77% | 11.7 |
| April | 57% | 21% | 38 | 13 °C | 0% | 34% | 14.0 |
| May | 71% | 26% | 65 | 17 °C | 0% | 6% | 16.0 |
| June | 71% | 28% | 71 | 21 °C | 2% | 0% | 17.2 |
| July | 64% | 33% | 99 | 23 °C | 4% | 0% | 16.7 |
| August | 68% | 29% | 77 | 23 °C | 4% | 0% | 14.9 |
| September | 80% | 19% | 51 | 18 °C | 0% | 1% | 12.6 |
| October | 56% | 22% | 54 | 12 °C | 0% | 30% | 10.4 † |
| November | 13% | 20% | 48 | 6 °C | 0% | 83% | 8.4 † |
| December | 1% | 20% | 48 | 3 °C | 0% | 98% | 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 near Braniewo → Sępopol, km/h | Headwind > 15 km/h, near Braniewo → Sępopol | Headwind > 15 km/h, Sępopol → near Braniewo | Better way |
|---|---|---|---|---|
| January | +3.7 | 5% | 17% | near Braniewo → Sępopol |
| February | +3.0 | 6% | 16% | near Braniewo → Sępopol |
| March | +3.1 | 6% | 15% | near Braniewo → Sępopol |
| April | +2.3 | 5% | 13% | near Braniewo → Sępopol |
| May | +1.2 | 5% | 9% | either |
| June | +2.7 | 3% | 11% | near Braniewo → Sępopol |
| July | +3.7 | 2% | 11% | near Braniewo → Sępopol |
| August | +2.8 | 2% | 10% | near Braniewo → Sępopol |
| September | +2.1 | 4% | 12% | near Braniewo → Sępopol |
| October | +3.1 | 6% | 15% | near Braniewo → Sępopol |
| November | +2.9 | 5% | 14% | near Braniewo → Sępopol |
| December | +4.4 | 4% | 18% | near Braniewo → Sępopol |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | E | +2.1 |
| 25–51 | NE | +3.1 |
| 51–77 | SE | +0.3 |
| 77–103 | E | +2.9 |
| 103–128 | N | +2.2 |
| 128–148 | E | +2.5 |
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.