In December, Shiojiri typically sees daytime highs of 4.1°C and overnight lows around -5.7°C. Compared to the annual average high of 14.4°C, December runs -10.3°C.
December in Shiojiri averages a daytime high of 4.1°C and an overnight low of -5.7°C.
December runs -10.3°C compared to Shiojiri's annual average high of 14.4°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 4.1°C and cooler evenings around -5.7°C.