BiH North-South: which way and when to ride
The best month for BiH North-South is October: 72% of days were dry with highs of 10–30 °C. In October the wind barely favours either direction — on average 1.0 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 | 13% | 25% | 93 | 4 °C | 0% | 85% | 9.2 † |
| February | 25% | 28% | 89 | 7 °C | 0% | 70% | 10.4 † |
| March | 43% | 30% | 102 | 10 °C | 0% | 47% | 11.8 |
| April | 59% | 33% | 95 | 16 °C | 0% | 16% | 13.4 |
| May | 55% | 43% | 127 | 19 °C | 1% | 3% | 14.8 |
| June | 52% | 37% | 98 | 24 °C | 12% | 0% | 15.5 |
| July | 50% | 29% | 78 | 26 °C | 24% | 0% | 15.2 |
| August | 52% | 24% | 67 | 27 °C | 25% | 0% | 14.0 |
| September | 68% | 27% | 89 | 21 °C | 5% | 2% | 12.4 |
| October | 72% | 20% | 88 | 16 °C | 0% | 12% | 10.9 † |
| November | 45% | 24% | 112 | 11 °C | 0% | 45% | 9.5 † |
| December | 14% | 23% | 102 | 6 °C | 0% | 82% | 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 Šamac → near Cista Provo, km/h | Headwind > 15 km/h, Šamac → near Cista Provo | Headwind > 15 km/h, near Cista Provo → Šamac | Better way |
|---|---|---|---|---|
| January | +0.2 | 2% | 3% | either |
| February | +0.9 | 3% | 4% | either |
| March | +1.1 | 4% | 5% | either |
| April | +1.1 | 3% | 4% | either |
| May | +0.7 | 2% | 2% | either |
| June | +1.4 | 1% | 2% | either |
| July | +2.4 | 1% | 2% | Šamac → near Cista Provo |
| August | +2.7 | 1% | 2% | Šamac → near Cista Provo |
| September | +2.0 | 1% | 2% | Šamac → near Cista Provo |
| October | +1.0 | 2% | 2% | either |
| November | −0.5 | 2% | 1% | either |
| December | +0.1 | 3% | 3% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in October, km/h |
|---|---|---|
| 0–25 | SW | +1.4 |
| 25–51 | SW | +1.7 |
| 51–76 | S | +1.5 |
| 76–101 | S | +1.0 |
| 101–126 | SW | +1.5 |
| 126–151 | SW | +0.8 |
| 151–176 | SW | +0.6 |
| 176–202 | W | +0.5 |
| 202–227 | SW | +0.5 |
| 227–252 | SW | +0.4 |
| 252–277 | S | 0.0 |
| 277–303 | SW | +1.4 |
| 303–315 | SW | +1.5 |
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.