December in Chikuma averages a daily high of 7.2°C. Expect roughly 11.1 wet days totalling 53.3mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Chikuma is May–June.
Based on NAGANO, JA (18.4km), 1995–2024. 20 years of December data.