BiH Trebinje, stage 3: Sokolac → Zvornik
On stage 3 (Sokolac → Zvornik, 102 km) the best month is October: 71% of days were dry with highs of 10–30 °C; the wind barely favours either direction (0.9 km/h on average; ERA5 2006–2025, 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 | 16% | 23% | 75 | 4 °C | 0% | 83% | 9.2 † |
| February | 30% | 27% | 71 | 7 °C | 0% | 66% | 10.4 † |
| March | 45% | 31% | 91 | 11 °C | 0% | 44% | 11.8 |
| April | 60% | 34% | 89 | 16 °C | 0% | 15% | 13.4 |
| May | 55% | 43% | 124 | 20 °C | 1% | 3% | 14.8 |
| June | 47% | 43% | 117 | 24 °C | 12% | 0% | 15.5 |
| July | 48% | 32% | 90 | 26 °C | 23% | 0% | 15.2 |
| August | 52% | 26% | 73 | 26 °C | 23% | 0% | 14.0 |
| September | 68% | 27% | 78 | 22 °C | 5% | 2% | 12.4 |
| October | 71% | 21% | 70 | 17 °C | 0% | 15% | 10.9 † |
| November | 50% | 21% | 78 | 11 °C | 0% | 42% | 9.6 † |
| December | 17% | 22% | 79 | 5 °C | 0% | 80% | 8.9 † |
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 Sokolac → Zvornik, km/h | Headwind > 15 km/h, Sokolac → Zvornik | Headwind > 15 km/h, Zvornik → Sokolac | Better way |
|---|---|---|---|---|
| January | +1.3 | 1% | 2% | either |
| February | +0.1 | 1% | 3% | either |
| March | −0.8 | 1% | 4% | either |
| April | −1.9 | 1% | 3% | either |
| May | −1.9 | 1% | 1% | either |
| June | −2.8 | 0% | 1% | Zvornik → Sokolac |
| July | −3.6 | 0% | 0% | Zvornik → Sokolac |
| August | −3.7 | 0% | 0% | Zvornik → Sokolac |
| September | −2.6 | 0% | 1% | Zvornik → Sokolac |
| October | −0.9 | 0% | 1% | either |
| November | +1.4 | 0% | 2% | either |
| December | +1.6 | 0% | 3% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in October, km/h |
|---|---|---|
| 248–273 | NE | −0.2 |
| 273–298 | N | −1.2 |
| 298–323 | NE | −0.7 |
| 323–350 | N | −1.3 |
Other stages
- Trebinje → Foča 142 km
- Foča → Sokolac 102 km
- Sokolac → Zvornik 102 km
- Zvornik → Bijeljina 69 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.