Velomarshrut - Podbalkanskiyat pat, stage 2: Karlovo → Nikolaevo
On stage 2 (Karlovo → Nikolaevo, 110 km) the best month is October: 80% of days were dry with highs of 10–30 °C; the wind barely favours either direction (0.0 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 | 14% | 17% | 58 | 4 °C | 0% | 85% | 9.4 † |
| February | 29% | 17% | 49 | 7 °C | 0% | 69% | 10.5 † |
| March | 49% | 24% | 65 | 11 °C | 0% | 41% | 11.8 |
| April | 64% | 33% | 71 | 16 °C | 0% | 9% | 13.3 |
| May | 57% | 43% | 101 | 21 °C | 0% | 0% | 14.6 |
| June | 48% | 42% | 98 | 25 °C | 11% | 0% | 15.3 |
| July | 46% | 26% | 64 | 28 °C | 31% | 0% | 15.0 |
| August | 53% | 17% | 44 | 29 °C | 33% | 0% | 13.9 |
| September | 79% | 15% | 47 | 24 °C | 6% | 0% | 12.4 |
| October | 80% | 16% | 67 | 17 °C | 0% | 8% | 11.0 † |
| November | 53% | 15% | 53 | 11 °C | 0% | 40% | 9.7 † |
| December | 16% | 17% | 61 | 6 °C | 0% | 82% | 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 Karlovo → Nikolaevo, km/h | Headwind > 15 km/h, Karlovo → Nikolaevo | Headwind > 15 km/h, Nikolaevo → Karlovo | Better way |
|---|---|---|---|---|
| January | +0.9 | 0% | 1% | either |
| February | +0.3 | 0% | 1% | either |
| March | +0.5 | 1% | 3% | either |
| April | −0.1 | 1% | 2% | either |
| May | −0.4 | 0% | 1% | either |
| June | −0.2 | 0% | 1% | either |
| July | −0.3 | 0% | 1% | either |
| August | −1.4 | 0% | 1% | either |
| September | −0.4 | 0% | 1% | either |
| October | 0.0 | 0% | 1% | either |
| November | −0.2 | 1% | 1% | either |
| December | +0.6 | 0% | 1% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in October, km/h |
|---|---|---|
| 140–166 | E | −0.2 |
| 166–193 | E | −0.2 |
| 193–218 | SE | +1.5 |
| 218–244 | E | −0.9 |
| 244–250 | NE | −0.6 |
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.