December in Grand Island averages a daily high of 3.9°C with nights around -7.7°C. Expect roughly 5.2 wet days totalling 19.9mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Grand Island is September–October.
Based on GRAND ISLAND CENTRAL NE REGIONAL AIRPORT, NE US (4.7km), 1995–2024. 30 years of December data.