December in Spokane Valley averages a daily high of 2.6°C with nights around -3.2°C. Expect roughly 14.5 wet days totalling 58.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Spokane Valley is August–September.
Based on SPOKANE FELTS FIELD, WA US (6.3km), 1995–2024. 27 years of December data.