December in Caldwell averages a daily high of 3.1°C with nights around -5.4°C. Expect roughly 5.3 wet days totalling 24.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Caldwell is May–June.
Based on HOMEDALE 1 SE, ID US (19.9km), 1995–2024. 16 years of December data.