December in Kaunas averages a daily high of 0.4°C with nights around -3.8°C. Expect roughly 15.8 wet days totalling 40.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Kaunas is May–September.
Based on KAUNAS, LH (5.3km), 1995–2024. 14 years of December data.