Weather forecast for the Vía Gebennensis in December

The first part, from Geneva to Col du Mont-Sion, is quite cold with temperatures usually between -1°C to -3°C at night and around 5°C during the day. There's moderate rain, some clouds, and sometimes snow.

As you move towards Serrières-en-Chautagne and Yenne, it gets a bit warmer, with temperatures between 6°C and 7°C. Rainfall is similar to before, but you'll see more sunny and cloudy days, and occasional rain or snow showers.

Further south, from Saint-Genix-sur-Guiers to La Côte-Saint-André, temperatures rise to highs of 7°C to 8°C and lows near 0°C. There's less rain, with more sunny or partly cloudy days, and some light rain or rare snow showers.

In the last sections, from Bourg-Argental to Le Puy-en-Velay, temperatures range from 5°C to 8°C during the day and 0°C to -1°C at night. There’s even less rain, with more cloudy days and some sunny intervals. You might still see rain and sometimes freezing rain.

Overall, expect cold weather, some rain and snow, and gradually warmer conditions as you travel south.