December on the Tour du Mont Blanc feels like full winter. Expect frequent snowstorms and long cloudy spells, broken by crisp blue-sky windows after fronts pass. Days stay cold, with valleys near freezing and ridges much colder; nights are very cold. Most precipitation falls as snow, though the lowest villages can see brief sleet or a short thaw in milder pulses. Winds pick up with each system, strongest on high cols and open ridges. Overall it is a snowy, wintry month with short, calm interludes.
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Starting near Les Houches, December often brings overcast skies with recurring snow showers, occasionally clearing to bright, cold spells. Through Les Contamines the pattern holds, with calm periods between systems; in the valleys temperatures hover around freezing while higher ground stays well below. As you arc toward Tré-le-Champ and Refuge La Flégère, the terrain is colder and more exposed, so passing fronts can deliver heavy snow, blowing spindrift, and low visibility. Returning toward Les Houches, the cloud can lift at times and a brief thaw is possible in sheltered valley sections before the next snowfall arrives.
From Les Chapieux toward Rifugio Elisabetta, storms frequently funnel across the high cols, bringing persistent snowfall and biting winds; clear breaks are sharp and very cold. Dropping to Courmayeur, cloud often thins and the valley can feel a touch milder, with sunny intervals between systems. Climbing again toward Rifugio Bonatti, shade and elevation return, and snow showers are common, with occasional heavy bursts when a front passes. Overall, valleys sit near freezing in calmer spells, while the high basins remain much colder and windier.
Crossing into La Fouly, expect repeated snowfalls under thick cloud, with short quiet windows. Toward Champex-Lac, the lower elevation sometimes brings lighter winds and, during brief mild intrusions, a mix of wet snow or sleet before temperatures dip again. The climb toward Col de la Forclaz turns harsher: frequent snowfall, gusty winds on exposed slopes, and cloud that can sit low over the pass, followed by sudden, bright clearances. Lower villages may edge close to freezing in those mild pulses, but the passes usually stay well below it.
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