December on St. Olavsleden is firmly wintry. Most days are overcast, with frequent snowfall across the route and only short, occasional clear spells. Inland and at higher elevations it stays well below freezing, while the Norwegian end nearer the coast hovers closer to freezing with brief thaws. Precipitation varies from light flurries to longer snowfalls, and near the coast it can tilt to sleet or cold rain.
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From the Baltic coast westward, days are mostly grey with regular light to moderate snowfall and occasional heavier bursts. Near lower-lying sections, brief thaws can bring wet snow or a touch of drizzle before temperatures dip again. Readings sit around or a little below freezing, with colder nights. As you move inland, snowfall remains frequent and the snow cover firms up.
Crossing into Jämtland, snow becomes the default, shifting between steady flurries and longer spells, with several stretches prone to heavy falls through the central valleys. Cloud dominates and bright breaks are short-lived. Temperatures are commonly well below freezing, with sharper cold during occasional outbreaks. Toward Åre, Tännforsen, and the high border area, snowfall stays regular and can be intense, leaving a stable, deepening cover.
Descending into Norway, precipitation stays frequent but grows more mixed. The inland approach still sees regular snow, sometimes heavy, before milder air nearer the fjord adds wet snow, sleet, and spells of cold rain. Temperatures hover around freezing with short thaws closer to Trondheim. Overcast skies remain the norm, with only brief clearer interludes.
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