D2 Dolsko-Trbovlje-Brežice-državna meja (Savska kolesarska pot): which way and when to ride
The best month for D2 Dolsko-Trbovlje-Brežice-državna meja (Savska kolesarska pot) is October: 78% of days were dry with highs of 10–30 °C. In October the wind barely favours either direction — on average 0.2 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 | 15% | 16% | 61 | 5 °C | 0% | 83% | 9.0 † |
| February | 32% | 18% | 68 | 7 °C | 0% | 64% | 10.3 † |
| March | 59% | 19% | 68 | 12 °C | 0% | 31% | 11.8 |
| April | 70% | 26% | 71 | 17 °C | 0% | 8% | 13.5 |
| May | 64% | 35% | 112 | 21 °C | 1% | 1% | 14.9 |
| June | 57% | 29% | 92 | 26 °C | 15% | 0% | 15.7 |
| July | 47% | 27% | 88 | 28 °C | 31% | 0% | 15.4 |
| August | 52% | 24% | 98 | 27 °C | 26% | 0% | 14.1 |
| September | 74% | 24% | 117 | 22 °C | 2% | 0% | 12.5 |
| October | 78% | 18% | 88 | 16 °C | 0% | 7% | 10.8 † |
| November | 43% | 20% | 94 | 10 °C | 0% | 48% | 9.4 † |
| December | 12% | 17% | 70 | 6 °C | 0% | 85% | 8.7 † |
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 Dolsko → Bregana, km/h | Headwind > 15 km/h, Dolsko → Bregana | Headwind > 15 km/h, Bregana → Dolsko | Better way |
|---|---|---|---|---|
| January | +0.5 | 0% | 2% | either |
| February | 0.0 | 1% | 3% | either |
| March | −0.3 | 2% | 4% | either |
| April | −0.4 | 1% | 2% | either |
| May | −0.4 | 0% | 2% | either |
| June | −0.7 | 0% | 1% | either |
| July | −1.4 | 0% | 1% | either |
| August | −2.5 | 0% | 0% | Bregana → Dolsko |
| September | −1.8 | 0% | 1% | either |
| October | −0.2 | 0% | 2% | either |
| November | +0.2 | 0% | 2% | either |
| December | +0.6 | 0% | 1% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in October, km/h |
|---|---|---|
| 0–25 | E | −0.5 |
| 25–50 | E | +0.4 |
| 50–75 | SE | −0.2 |
| 75–101 | SE | −0.4 |
| 101–112 | SE | −0.5 |
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.