December in Niitsu-honchō averages a daily high of 9°C. Expect roughly 23.6 wet days totalling 246.7mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Niitsu-honchō is May–June.
Based on NIIGATA, JA (14.5km), 1995–2024. 16 years of December data.