December in Hoorn averages a daily high of 7.1°C with nights around 2.2°C. Expect roughly 18.3 wet days totalling 87.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Hoorn is June–September.
Based on BERKHOUT, NL (5.5km), 1995–2024. 26 years of December data.