December in Shimodate averages a daily high of 11°C. Expect roughly 5.1 wet days totalling 48.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Shimodate is April–June.
Based on UTSUNOMIYA, JA (29.7km), 1995–2024. 25 years of December data.