In December, the weather along the Vía Gebennensis is characterized by varied conditions, including frequent rain, occasional snow, and periods of sunshine. Temperatures fluctuate significantly, often dropping below freezing at night. High temperatures occasionally reach double digits during the day, but lows frequently plummet, especially in the higher altitudes. The region experiences a mix of dry days as well as days with heavy precipitation, leading to diverse walking experiences through different terrains.
The journey from Genève to Col du Mont-Sion begins with temperatures occasionally reaching 12°C, though frequently dropping to -7°C, with significant precipitation including moderate or heavy rain and occasional snow. Upon reaching Frangy, the weather remains unpredictable, with sunny spells interrupted by heavy rain and snow showers, while temperatures vary from -13°C to 11°C.
As travelers continue to Serrières-en-Chautagne, they encounter fluctuating conditions with sunshine and heavy rain interspersed, while highs can reach up to 12°C. Moving on to Yenne, the walkers enjoy sunny days, although heavy showers and snowfall keep conditions varied, with daytime temperatures occasionally rising to 14°C.
At Saint-Genix-sur-Guiers, moderate rain showers and some sunny periods characterize the forecast, with temperatures moderately ranging around 12°C. The route through Le Pin is marked by intermittent heavy rain and snow, alongside breaks of partial sunshine, and temperatures varying from 1°C to 13°C.
As the trail continues towards La Côte-Saint-André, the walkers face a mix of cloudy and rainy days with instances of heavy snowfall and frequent changes in temperature, touching up to 12°C. Revel-Tourdan to Saint-Romain-de-Surieu witnesses overcast and cloudy conditions with occasional sunny periods and rain showers, making for a dynamic weather experience through this stretch.
From Chavanay to Bourg-Argental, the weather transitions with patches of freezing rain and recurring rain showers, while temperatures remain on the lower side, intermittently warming up during sunny breaks. At Les Sétoux, the weather tends to remain overcast with occasional snow showers as the walkers progress through varying temperatures reaching up to 10°C.
Continuing to Montfaucon-en-Velay, the weather remains overcast with a chance of rain which sometimes occurs heavily, alongside clearer and sunny periods, though temperatures drop to 1°C on colder days. As the route progresses to Araules and beyond, frequent heavy rain and snow mark this part of the trail, with significant changes in temperatures.
Finally, crossing Saint-Julien-Chapteuil and leading to Le Puy-en-Velay, the walkers experience freezing conditions with snow showers and rain interspersed with sunny intervals; temperatures continue to waver significantly, contributing to the dynamic weather journey along the Vía Gebennensis.
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