In December, Skien typically sees daytime highs of 1.0°C and overnight lows around -3.8°C. Compared to the annual average high of 9.6°C, December runs -8.6°C.
December in Skien averages a daytime high of 1.0°C and an overnight low of -3.8°C.
December runs -8.6°C compared to Skien's annual average high of 9.6°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 1.0°C and cooler evenings around -3.8°C.