Nasjonal sykkelrute 4, stage 3: Geilo → near Lærdalsøyri
On stage 3 (Geilo → near Lærdalsøyri, 136 km) the best month is August: 48% of days were dry with highs of 10–30 °C; the wind barely favours either direction (0.2 km/h on average; ERA5 2006–2025, 9:00–18:00).
← Nasjonal sykkelrute 4 (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 | 0% | 37% | 130 | -4 °C | 0% | 100% | 6.5 † |
| February | 0% | 31% | 97 | -4 °C | 0% | 100% | 8.9 † |
| March | 0% | 33% | 102 | -1 °C | 0% | 100% | 11.6 |
| April | 3% | 28% | 72 | 2 °C | 0% | 97% | 14.5 |
| May | 23% | 34% | 79 | 7 °C | 0% | 73% | 17.3 |
| June | 47% | 41% | 104 | 13 °C | 0% | 31% | 19.1 |
| July | 47% | 49% | 127 | 15 °C | 0% | 14% | 18.3 |
| August | 48% | 46% | 128 | 13 °C | 0% | 17% | 15.7 |
| September | 33% | 41% | 132 | 10 °C | 0% | 55% | 12.8 |
| October | 3% | 38% | 138 | 4 °C | 0% | 96% | 9.9 † |
| November | 0% | 34% | 125 | -1 °C | 0% | 100% | 7.2 † |
| December | 0% | 39% | 149 | -3 °C | 0% | 100% | 5.7 † |
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 Geilo → near Lærdalsøyri, km/h | Headwind > 15 km/h, Geilo → near Lærdalsøyri | Headwind > 15 km/h, near Lærdalsøyri → Geilo | Better way |
|---|---|---|---|---|
| January | 0.0 | 6% | 2% | either |
| February | +0.1 | 5% | 1% | either |
| March | −0.4 | 6% | 2% | either |
| April | −0.8 | 5% | 2% | either |
| May | −0.4 | 4% | 2% | either |
| June | −1.0 | 5% | 2% | either |
| July | −0.3 | 5% | 2% | either |
| August | +0.2 | 3% | 2% | either |
| September | +0.1 | 6% | 3% | either |
| October | +0.5 | 4% | 2% | either |
| November | +0.6 | 4% | 1% | either |
| December | −0.1 | 5% | 1% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in August, km/h |
|---|---|---|
| 250–275 | W | −2.2 |
| 275–301 | W | −0.9 |
| 301–326 | NW | +0.2 |
| 326–351 | N | +2.0 |
| 351–376 | NE | +1.8 |
| 376–386 | N | +0.9 |
Other stages
- Asker → Flå 135 km
- Flå → Geilo 115 km
- Geilo → near Lærdalsøyri 136 km
- near Lærdalsøyri → Ål 155 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.