December in Sandy averages a daily high of 4.1°C with nights around -4.5°C. Expect roughly 9.1 wet days totalling 58.4mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Sandy is May–June.
Based on COTTONWOOD WEIR, UT US (9km), 1995–2024. 30 years of December data.