December in Karlskrona averages a daily high of 4.7°C with nights around 1.3°C. Expect roughly 13.3 wet days totalling 30.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Karlskrona is June–September.
Based on KARLSKRONA SODERSTJ., SW (1.3km), 1995–2024. 15 years of December data.