December in Skien averages a daily high of 0.6°C with nights around -4.6°C. Expect roughly 14.1 wet days totalling 54mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Skien is June–September.
Based on GVARV NES, NO (30.1km), 1995–2024. 28 years of December data.