December in Chichibu averages a daily high of 11.3°C. Expect roughly 4.1 wet days totalling 34.5mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Chichibu is September–November.
Based on CHICHIBU, JA (1.2km), 1995–2024. 27 years of December data.