December in West Valley City averages a daily high of 4.1°C with nights around -4.3°C. Expect roughly 10 wet days totalling 37.8mm. A hard month to visit for comfort alone.
Across the year, the best time to visit West Valley City is May–June.
Based on SALT LAKE CITY INTERNATIONAL AIRPORT, UT US (9.3km), 1995–2024. 30 years of December data.