December in Arvada averages a daily high of 8.3°C with nights around -8°C. Expect roughly 4.9 wet days totalling 17.7mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Arvada is May–June.
Based on WHEAT RIDGE 2, CO US (3.9km), 1995–2024. 29 years of December data.