In December, Koga typically sees daytime highs of 11.9°C and overnight lows around 4.5°C. Compared to the annual average high of 19.7°C, December runs -7.8°C.
December in Koga averages a daytime high of 11.9°C and an overnight low of 4.5°C.
December runs -7.8°C compared to Koga's annual average high of 19.7°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 11.9°C and cooler evenings around 4.5°C.