December in Deer Valley averages a daily high of 18.1°C with nights around 6.2°C. Expect roughly 4.2 wet days totalling 22.2mm. Comfortable conditions for being outdoors all day.
Across the year, the best time to visit Deer Valley is January–April.
Based on PHOENIX DEER VALLEY MUNICIPAL AIRPORT, AZ US (6.4km), 1995–2024. 27 years of December data.