December in Rui’an averages a daily high of 15.5°C with nights around 7.9°C. Expect roughly 8.8 wet days totalling 57.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Rui’an is October.
Based on RUIAN, CH (1.1km), 1995–2024. 20 years of December data.