Cykelspåret (10): which way and when to ride
The best month for Cykelspåret (10) is September: 79% of days were dry with highs of 10–30 °C. In September the wind barely favours either direction — on average 0.5 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 | 0% | 14% | 39 | 0 °C | 0% | 100% | 6.6 † |
| February | 0% | 14% | 30 | 0 °C | 0% | 100% | 9.0 † |
| March | 11% | 13% | 29 | 4 °C | 0% | 89% | 11.6 |
| April | 36% | 15% | 33 | 9 °C | 0% | 61% | 14.5 |
| May | 66% | 20% | 46 | 14 °C | 0% | 19% | 17.2 |
| June | 74% | 24% | 58 | 19 °C | 1% | 1% | 18.9 |
| July | 71% | 26% | 76 | 21 °C | 2% | 0% | 18.1 |
| August | 72% | 28% | 84 | 20 °C | 0% | 0% | 15.6 |
| September | 79% | 19% | 51 | 16 °C | 0% | 2% | 12.7 |
| October | 40% | 18% | 58 | 10 °C | 0% | 50% | 9.9 † |
| November | 6% | 19% | 48 | 5 °C | 0% | 93% | 7.3 † |
| December | 1% | 19% | 44 | 2 °C | 0% | 98% | 5.8 † |
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 Hallstavik → near Karlholmsbruk, km/h | Headwind > 15 km/h, Hallstavik → near Karlholmsbruk | Headwind > 15 km/h, near Karlholmsbruk → Hallstavik | Better way |
|---|---|---|---|---|
| January | −1.6 | 12% | 8% | either |
| February | −1.5 | 10% | 6% | either |
| March | −2.0 | 11% | 5% | near Karlholmsbruk → Hallstavik |
| April | −2.0 | 10% | 4% | either |
| May | +0.6 | 6% | 6% | either |
| June | +0.1 | 6% | 4% | either |
| July | +0.3 | 5% | 4% | either |
| August | +0.5 | 5% | 5% | either |
| September | −0.5 | 8% | 6% | either |
| October | −1.2 | 9% | 7% | either |
| November | −1.0 | 9% | 7% | either |
| December | −1.9 | 11% | 7% | either |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | NW | +0.6 |
| 25–50 | W | −1.9 |
| 50–76 | W | −2.6 |
| 76–101 | N | +1.0 |
| 101–109 | N | +2.5 |
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.