In December, Iwamizawa typically sees daytime highs of 0.5°C and overnight lows around -7.9°C. Compared to the annual average high of 11.4°C, December runs -10.9°C.
December in Iwamizawa averages a daytime high of 0.5°C and an overnight low of -7.9°C.
December runs -10.9°C compared to Iwamizawa's annual average high of 11.4°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 0.5°C and cooler evenings around -7.9°C.