December in Grand Prairie averages a daily high of 14.2°C with nights around 2.8°C. Expect roughly 5.4 wet days totalling 68.3mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Grand Prairie is March–May.
Based on ARLINGTON SIX FLAGS, TX US (7.2km), 1995–2024. 22 years of December data.