Velomarshrut - Podbalkanskiyat pat, stage 3: Nikolaevo → Karnobat
On stage 3 (Nikolaevo → Karnobat, 111 km) the best month is September: 81% of days were dry with highs of 10–30 °C; the wind barely favours either direction (1.6 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 | 15% | 18% | 63 | 5 °C | 0% | 83% | 9.4 † |
| February | 26% | 17% | 52 | 7 °C | 0% | 70% | 10.5 † |
| March | 47% | 22% | 59 | 11 °C | 0% | 43% | 11.8 |
| April | 67% | 30% | 64 | 16 °C | 0% | 8% | 13.3 |
| May | 62% | 38% | 94 | 21 °C | 0% | 0% | 14.6 |
| June | 56% | 38% | 91 | 25 °C | 8% | 0% | 15.3 |
| July | 49% | 24% | 58 | 28 °C | 29% | 0% | 15.0 |
| August | 53% | 14% | 36 | 29 °C | 34% | 0% | 13.9 |
| September | 81% | 15% | 44 | 24 °C | 4% | 0% | 12.4 |
| October | 80% | 16% | 68 | 17 °C | 0% | 7% | 11.0 † |
| November | 54% | 16% | 56 | 11 °C | 0% | 37% | 9.7 † |
| December | 18% | 16% | 68 | 6 °C | 0% | 79% | 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 Nikolaevo → Karnobat, km/h | Headwind > 15 km/h, Nikolaevo → Karnobat | Headwind > 15 km/h, Karnobat → Nikolaevo | Better way |
|---|---|---|---|---|
| January | +2.6 | 0% | 2% | Nikolaevo → Karnobat |
| February | +1.6 | 1% | 2% | either |
| March | +1.2 | 1% | 3% | either |
| April | −0.3 | 2% | 3% | either |
| May | −1.0 | 2% | 1% | either |
| June | −1.3 | 1% | 0% | either |
| July | −2.0 | 2% | 1% | either |
| August | −3.9 | 3% | 0% | Karnobat → Nikolaevo |
| September | −1.6 | 3% | 2% | either |
| October | −0.1 | 1% | 2% | either |
| November | +1.0 | 1% | 2% | either |
| December | +2.2 | 0% | 1% | Nikolaevo → Karnobat |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 248–273 | E | −1.6 |
| 273–299 | E | −0.5 |
| 299–325 | E | −1.6 |
| 325–353 | E | −2.5 |
| 353–359 | E | −2.6 |
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.