Velomarshrut - Podbalkanskiyat pat, stage 4: Karnobat → Burgas
On stage 4 (Karnobat → Burgas, 70 km) the best month is September: 84% of days were dry with highs of 10–30 °C; the wind barely favours either direction (0.7 km/h on average; ERA5 2006–2025, 9:00–18:00).
← Velomarshrut - Podbalkanskiyat pat (Whole route)
Weather by month
| Month | Good days | Rain days ≥ 1 mm | Rain, mm | Avg high | Days ≥ 30 °C | Days < 10 °C | Daylight, h |
|---|---|---|---|---|---|---|---|
| January | 22% | 17% | 60 | 6 °C | 0% | 74% | 9.4 † |
| February | 32% | 15% | 48 | 8 °C | 0% | 64% | 10.5 † |
| March | 52% | 19% | 51 | 12 °C | 0% | 39% | 11.8 |
| April | 74% | 24% | 52 | 16 °C | 0% | 5% | 13.3 |
| May | 72% | 28% | 64 | 21 °C | 0% | 0% | 14.6 |
| June | 65% | 29% | 66 | 26 °C | 7% | 0% | 15.3 |
| July | 58% | 17% | 41 | 29 °C | 28% | 0% | 15.0 |
| August | 59% | 10% | 25 | 29 °C | 33% | 0% | 13.9 |
| September | 84% | 12% | 38 | 24 °C | 4% | 0% | 12.4 |
| October | 83% | 15% | 62 | 18 °C | 0% | 4% | 11.0 † |
| November | 66% | 13% | 48 | 13 °C | 0% | 25% | 9.7 † |
| December | 28% | 15% | 62 | 8 °C | 0% | 67% | 9.1 † |
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 Karnobat → Burgas, km/h | Headwind > 15 km/h, Karnobat → Burgas | Headwind > 15 km/h, Burgas → Karnobat | Better way |
|---|---|---|---|---|
| January | +3.5 | 2% | 9% | Karnobat → Burgas |
| February | +2.4 | 3% | 9% | Karnobat → Burgas |
| March | +1.3 | 4% | 8% | either |
| April | −0.4 | 5% | 6% | either |
| May | −1.2 | 3% | 3% | either |
| June | −1.1 | 2% | 2% | either |
| July | −1.7 | 3% | 3% | either |
| August | −2.8 | 5% | 4% | Burgas → Karnobat |
| September | −0.7 | 5% | 6% | either |
| October | +0.7 | 2% | 6% | either |
| November | +1.6 | 3% | 7% | either |
| December | +3.3 | 2% | 7% | Karnobat → Burgas |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 358–383 | E | −3.7 |
| 383–408 | E | −2.2 |
| 408–428 | S | +5.0 |
Other stages
- near Sofia → Karlovo 140 km
- Karlovo → Nikolaevo 110 km
- Nikolaevo → Karnobat 111 km
- Karnobat → Burgas 70 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.