December in Caltanissetta averages a daily high of 10.4°C. Expect roughly 8.6 wet days totalling 52.4mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Caltanissetta is May–September.
Based on ENNA, IT (21.3km), 1995–2024. 12 years of December data.