In December, Karatsu typically sees daytime highs of 11.0°C and overnight lows around 4.7°C. Compared to the annual average high of 19.4°C, December runs -8.4°C.
December in Karatsu averages a daytime high of 11.0°C and an overnight low of 4.7°C.
December runs -8.4°C compared to Karatsu's annual average high of 19.4°C, ranking #10 of 12 months by warmth.
Plan for daytime highs near 11.0°C and cooler evenings around 4.7°C.