December in Kastamonu averages a daily high of 5.6°C with nights around -1.9°C. Expect roughly 11.1 wet days totalling 34.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Kastamonu is July–October.
Based on KASTAMONU, TU (1.4km), 1995–2024. 16 years of December data.