In December, Oyama typically sees daytime highs of 11.2°C and overnight lows around -0.1°C. Compared to the annual average high of 19.1°C, December runs -7.9°C.
December in Oyama averages a daytime high of 11.2°C and an overnight low of -0.1°C.
December runs -7.9°C compared to Oyama's annual average high of 19.1°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 11.2°C and cooler evenings around -0.1°C.