EuroVelo 13 - Iron Curtain Trail - part Bulgaria South, stage 4: Dzhebel → near Ivaylovgrad
On stage 4 (Dzhebel → near Ivaylovgrad, 114 km) the best month is October: 83% of days were dry with highs of 10–30 °C; the wind barely favours either direction (1.7 km/h on average; ERA5 2006–2025, 9:00–18:00).
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Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 23% | 19% | 79 | 6 °C | 0% | 71% | 9.5 † |
| February | 36% | 19% | 64 | 8 °C | 0% | 58% | 10.6 † |
| March | 57% | 23% | 76 | 12 °C | 0% | 30% | 11.8 |
| April | 73% | 25% | 62 | 17 °C | 0% | 4% | 13.3 |
| May | 71% | 29% | 68 | 22 °C | 0% | 0% | 14.5 |
| June | 53% | 26% | 65 | 27 °C | 22% | 0% | 15.2 |
| July | 37% | 13% | 28 | 30 °C | 52% | 0% | 14.9 |
| August | 30% | 7% | 18 | 31 °C | 64% | 0% | 13.8 |
| September | 75% | 11% | 35 | 26 °C | 15% | 0% | 12.4 |
| October | 83% | 15% | 78 | 19 °C | 0% | 4% | 11.0 |
| November | 65% | 17% | 62 | 13 °C | 0% | 22% | 9.8 † |
| December | 30% | 18% | 82 | 8 °C | 0% | 63% | 9.2 † |
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 Dzhebel → near Ivaylovgrad, km/h | Headwind > 15 km/h, Dzhebel → near Ivaylovgrad | Headwind > 15 km/h, near Ivaylovgrad → Dzhebel | Better way |
|---|---|---|---|---|
| January | +0.8 | 0% | 2% | either |
| February | +0.2 | 1% | 3% | either |
| March | +0.2 | 2% | 4% | either |
| April | −1.0 | 2% | 2% | either |
| May | −1.4 | 2% | 1% | either |
| June | −2.9 | 2% | 0% | near Ivaylovgrad → Dzhebel |
| July | −4.5 | 3% | 0% | near Ivaylovgrad → Dzhebel |
| August | −6.0 | 7% | 0% | near Ivaylovgrad → Dzhebel |
| September | −3.3 | 4% | 1% | near Ivaylovgrad → Dzhebel |
| October | −1.7 | 1% | 1% | either |
| November | +0.2 | 0% | 3% | either |
| December | +0.5 | 1% | 2% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in October, km/h |
|---|---|---|
| 342–367 | E | −2.4 |
| 367–392 | E | −1.2 |
| 392–418 | NE | −2.9 |
| 418–443 | E | −0.3 |
| 443–456 | E | −1.8 |
Other stages
- near Novo Selo → Hadzhidimovo 112 km
- Hadzhidimovo → Smolyan 116 km
- Smolyan → Dzhebel 114 km
- Dzhebel → near Ivaylovgrad 114 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.