Jura Route: which way and when to ride
The best month for Jura Route is September: 68% of days were dry with highs of 10–30 °C. In September 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 | 4% | 29% | 116 | 4 °C | 0% | 94% | 8.9 † |
| February | 15% | 29% | 91 | 5 °C | 0% | 83% | 10.2 † |
| March | 36% | 32% | 107 | 9 °C | 0% | 55% | 11.8 |
| April | 53% | 37% | 106 | 14 °C | 0% | 25% | 13.5 |
| May | 51% | 48% | 158 | 17 °C | 0% | 7% | 15.0 |
| June | 53% | 45% | 151 | 21 °C | 3% | 0% | 15.9 |
| July | 56% | 39% | 152 | 23 °C | 7% | 0% | 15.5 |
| August | 58% | 37% | 149 | 23 °C | 6% | 0% | 14.2 |
| September | 68% | 32% | 119 | 19 °C | 0% | 2% | 12.5 |
| October | 63% | 28% | 111 | 14 °C | 0% | 16% | 10.8 † |
| November | 25% | 31% | 120 | 8 °C | 0% | 68% | 9.3 † |
| December | 4% | 34% | 135 | 4 °C | 0% | 93% | 8.5 † |
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 Basel → Nyon, km/h | Headwind > 15 km/h, Basel → Nyon | Headwind > 15 km/h, Nyon → Basel | Better way |
|---|---|---|---|---|
| January | −2.9 | 10% | 2% | Nyon → Basel |
| February | −2.0 | 9% | 3% | either |
| March | −0.8 | 9% | 4% | either |
| April | +1.0 | 4% | 3% | either |
| May | +0.3 | 4% | 4% | either |
| June | +0.7 | 2% | 3% | either |
| July | −0.3 | 2% | 1% | either |
| August | −0.7 | 2% | 0% | either |
| September | +0.2 | 3% | 2% | either |
| October | −1.1 | 4% | 2% | either |
| November | −2.5 | 7% | 1% | Nyon → Basel |
| December | −3.7 | 9% | 1% | Nyon → Basel |
Along the route (sections of about 25 km)
| km | Heading | Tailwind in September, km/h |
|---|---|---|
| 0–25 | SW | +0.1 |
| 25–50 | W | −0.2 |
| 50–75 | S | +0.7 |
| 75–101 | SW | +0.3 |
| 101–126 | SW | +0.3 |
| 126–151 | SW | −0.1 |
| 151–177 | SW | −0.3 |
| 177–202 | S | +0.5 |
| 202–227 | SW | −0.3 |
| 227–253 | S | +0.5 |
| 253–273 | S | +0.6 |
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.