December in Iaşi averages a daily high of 3.1°C with nights around -3°C. Expect roughly 8.4 wet days totalling 32.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Iaşi is May–June.
Based on IASI, RO (2.5km), 1995–2024. 30 years of December data.