BiH Trebinje, stage 2: Foča → Sokolac
On stage 2 (Foča → Sokolac, 102 km) the best month is October: 71% of days were dry with highs of 10–30 °C; the wind barely favours either direction (0.1 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 | 8% | 23% | 75 | 3 °C | 0% | 91% | 9.3 † |
| February | 22% | 27% | 74 | 6 °C | 0% | 75% | 10.4 † |
| March | 39% | 31% | 91 | 9 °C | 0% | 52% | 11.8 |
| April | 58% | 35% | 83 | 15 °C | 0% | 19% | 13.4 |
| May | 56% | 44% | 105 | 18 °C | 0% | 5% | 14.7 |
| June | 51% | 44% | 92 | 23 °C | 6% | 1% | 15.4 |
| July | 49% | 34% | 75 | 25 °C | 19% | 0% | 15.1 |
| August | 54% | 27% | 56 | 26 °C | 20% | 0% | 14.0 |
| September | 70% | 26% | 72 | 21 °C | 4% | 3% | 12.4 |
| October | 71% | 19% | 68 | 16 °C | 0% | 16% | 10.9 † |
| November | 46% | 21% | 88 | 10 °C | 0% | 47% | 9.6 † |
| December | 9% | 21% | 80 | 4 °C | 0% | 89% | 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 Foča → Sokolac, km/h | Headwind > 15 km/h, Foča → Sokolac | Headwind > 15 km/h, Sokolac → Foča | Better way |
|---|---|---|---|---|
| January | +0.1 | 1% | 1% | either |
| February | −0.1 | 2% | 2% | either |
| March | −0.3 | 2% | 4% | either |
| April | −0.3 | 1% | 3% | either |
| May | −0.2 | 1% | 2% | either |
| June | −1.1 | 1% | 1% | either |
| July | −1.8 | 1% | 1% | either |
| August | −1.3 | 0% | 0% | either |
| September | −0.8 | 1% | 1% | either |
| October | −0.1 | 1% | 1% | either |
| November | +1.3 | 0% | 2% | either |
| December | +0.3 | 1% | 2% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in October, km/h |
|---|---|---|
| 144–150 | W | +0.1 |
| 150–175 | NE | 0.0 |
| 175–201 | NE | −0.1 |
| 201–226 | NW | 0.0 |
| 226–245 | NW | −0.1 |
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.