In December, Muroran typically sees daytime highs of 1.9°C and overnight lows around -4.7°C. Compared to the annual average high of 11.4°C, December runs -9.5°C.
December in Muroran averages a daytime high of 1.9°C and an overnight low of -4.7°C.
December runs -9.5°C compared to Muroran's annual average high of 11.4°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 1.9°C and cooler evenings around -4.7°C.