December in Waco averages a daily high of 15.9°C with nights around 3.1°C. Expect roughly 6.5 wet days totalling 67.9mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Waco is March–April.
Based on WACO DAM, TX US (8.7km), 1995–2024. 16 years of December data.