December in Jyväskylä averages a daily high of -2.5°C with nights around -8°C. Expect roughly 17.4 wet days totalling 48.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Jyväskylä is June–August.
Based on JYVASKYLA LENTOASEMA, FI (18km), 1995–2024. 30 years of December data.