December in Azumino averages a daily high of 8.2°C. Expect roughly 6.1 wet days totalling 38.7mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Azumino is April–June.
Based on MATSUMOTO, JA (8.3km), 1995–2024. 27 years of December data.