December in Des Moines averages a daily high of 2.5°C with nights around -6.5°C. Expect roughly 7.5 wet days totalling 39mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Des Moines is September.
Based on DES MOINES INTERNATIONAL AIRPORT, IA US (8.3km), 1995–2024. 30 years of December data.