Weather forecast builder for the Via Francigena: Calais → Lausanne

The Via Francigena between Calais and Lausanne moves through exposed farmland and low hills before rising toward the Jura, where wind and sun influence daily pace. From the provided patterns, April, May, and August align with longer daylight, broadly moderate conditions, and generally open town‑based services along this stretch. Outside these windows, weather varies across regions—from cool, wet spells and occasional snow near Vaud in colder months to hot bursts and intermittent heavy showers during mid‑summer.

• Spring: Variable conditions with frequent rain, alternating sunny intervals, and temperature swings; gradual warming southward, with occasional freezing rain or snow early.
• Summer: Warm to hot spells with sunshine mixed by intermittent heavy showers; variability across regions, with relatively cooler, showery conditions approaching Vaud.
• Autumn: Mixed days with frequent showers and cloudy periods, interspersed with sunny breaks; progressive cooling, heavier rain episodes, and increasing chance of snow toward Vaud.
• Winter: Frequent rain with overcast skies, intermittent sunny spells, episodes of light snow or freezing rain, and lows often below freezing, especially east.