December in Lāhījān averages a daily high of 13.5°C. Expect roughly 11.6 wet days totalling 158.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Lāhījān is May–June.
Based on ANZALI, IR (56.1km), 1995–2024. 16 years of December data.