If you start the Via Francigena in Lausanne, Switzerland, the weather on this route changes a lot from the Alps to central Italy.
Around Lausanne, you'll often see cloudy and partly cloudy days in March. Sometimes, it snows or rains. The temperatures are usually around 7°C during the day, and it can get below freezing at night. It often rains, around 3.6 mm daily.
Once you reach northern Italy, the weather still changes a lot. It's often partly cloudy with medium to heavy rain. The temperatures get a little higher to around 14-15°C in the daytime, and around 6°C at night. The rain gets heaver, especially further on.
When you reach central Italy, the weather is usually nicer, with more sunny days. The temperatures are warmer, around 18°C when you get near Rome. There's still some rain but much less, around 1 to 2 mm per day.
So, throughout the route, you should be ready for all kinds of weather. For example, there might be snow in the beginning and nicer weather towards the end.
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