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December in Oyama 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 Oyama is April–June.
Based on UTSUNOMIYA, JA (28.4km), 1995–2024. 25 years of December data.
See all twelve months for Oyama →