The Vía Gebennensis, starting from Geneva in Switzerland and going through parts of France, usually sees cold and changing weather in January. Daytime temperatures are usually between 3°C and 7°C, while nights can get as cold as -3°C to 1°C.
It often rains lightly, but some areas get more rain. You can expect a lot of rain showers and cloudy skies. Sometimes, it might snow, especially in higher places. There can also be light freezing rain and moderate snow. Sunny days with clear or partly cloudy skies are not very common.
As you head south to places like Mont-Sion and Frangy, the temperatures don't change much from Geneva. Going further to areas like Bourg-Argental or Le Puy-en-Velay, you might see more freezing rain, and night temperatures can be even colder.
In summary, be ready for a cold and wet trip, with a mix of cloudy, rainy, and sometimes sunny days.
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