December in Orem averages a daily high of 5.4°C with nights around -3.9°C. Expect roughly 9.6 wet days totalling 48.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Orem is September–October.
Based on PROVO BYU, UT US (6.8km), 1995–2024. 30 years of December data.