December in Spokane averages a daily high of 1°C with nights around -4.5°C. Expect roughly 14.4 wet days totalling 63.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Spokane is June–September.
Based on SPOKANE INTERNATIONAL AIRPORT, WA US (8.5km), 1995–2024. 30 years of December data.