In December, Keflavik typically sees daytime highs of 2.9°C and overnight lows around -1.4°C. Compared to the annual average high of 6.8°C, December runs -4.0°C.
December in Keflavik averages a daytime high of 2.9°C and an overnight low of -1.4°C.
December runs -4.0°C compared to Keflavik's annual average high of 6.8°C, ranking #11 of 12 months by warmth.
Plan for daytime highs near 2.9°C and cooler evenings around -1.4°C.