December on the Via Francigena begins with wintry conditions in the Alps, where heavy snowfall and biting cold winds dominate. As the route progresses southward, the Swiss regions occasionally break with sunshine amidst periods of rain and snow. Crossing into Italy, temperatures become milder, hovering around highs of 10–14°C, with the ever-present possibility of rain showers. The month concludes in Lazio, where cloud cover and rain are frequent companions, interspersed with sunny intervals. Throughout, temperatures in the lower regions remain cool, with chilling lows reaching down to 0°C overnight.
Beginning in Lausanne, the route is greeted with frequent snow and cold temperatures ranging from -4°C to 9°C. Patchy rain is interspersed with sunny spells, offering brief relief. The path through Vevey and Aigle witnesses similar conditions, with heavy snowfall and chill winds.
As hikers progress to towns like Martigny and Orsières, moderate to heavy snow showers become common. The cold prevails, with highs seldom rising above 5°C and lows plummeting to -27°C in the higher altitudes around Bourg-Saint-Pierre.
Crossing the Great Saint Bernard Pass into Aosta and beyond, temperatures begin to moderate slightly. Here, occasional clear skies are punctuated by snow showers, with highs reaching 10°C in river valleys.
Upon entering the Piedmont region, particularly around Verres and Ivrea, conditions remain moderately cold with frequent periods of rain. High temperatures gradually edge towards 15°C in the sunny intervals.
In Lombardy, around Pavia and Belgioioso, clearer skies alternate with heavy rain. Often overcast, the highs can reach 12°C, but rain showers remain persistent throughout.
Fidenza to Aulla welcomes a sequence of mixed weather, characterized by brief sunny breaks amidst moderate rainfall. Highs range from 10°C to 15°C, with lows often just above freezing.
As the trail descends into Tuscany through Lucca and Siena, the weather calms, though unpredictably. Days can start sunny and end in heavy rains with temperatures hovering between 5°C at night and up to 14°C during the day.
Arriving in Lazio, the journey sees an increase in rain showers. Campagnano di Roma and Viterbo experience moderate rain with temperatures fluctuating between 4°C to 15°C. The final approach to Rome is marked by frequent rain showers but also warms to around 15°C.
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