December on Kungsleden is deep winter: skies are mostly cloudy and snow is frequent, ranging from light flurries to occasional heavy bursts. Sunshine is scarce but appears in short, cold breaks. Temperatures sit well below freezing most of the time, with sharper cold on higher ground and brief milder pulses in lower southern valleys. When it turns milder, the snow grows wetter and can even flip to a touch of drizzle in the valleys. Overall it feels quietly wintry and snowy, with stable cold punctuated by short stormy spells.
Starting in the far north, conditions are mostly overcast with frequent snow. Light flurries are common, but short-lived heavier bursts do roll through, separated by brief, colder clearings. Air temperatures are usually well below freezing, often around -5 to -15°C, with colder snaps on the high ground.
Crossing the high valleys and the main pass, the pattern holds: cloud dominates and snowfall is regular, at times building to heavier periods. Between systems it can turn quiet but grey, and any clearer intervals are crisp and short.
Descending toward the big lakes and river crossings, snowfall continues in waves. Some systems bring heavier, more sustained snow, while occasional near-freezing spells in the lower valleys make the snow wetter and can even produce a touch of drizzle. Lulls bring low, dull cloud with only brief hints of sun.
Through the central forests and uplands, snow arrives in recurring pulses, frequently moderate and sometimes heavy. Dry days do occur, but skies tend to stay overcast, and the air remains seasonally cold.
Farther south toward the higher plateaus and the final valleys, the storm track stays active. Heavy snowfall becomes more likely around the exposed high terrain, yet there are also brief thaws in sheltered valleys that leave slushy, wetter snow or light mixed precipitation before the cold reasserts itself. Between storms, it is mostly grey and quiet, occasionally clearing to sharp, cold stillness.
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