December in Plano averages a daily high of 14.8°C with nights around 3.7°C. Expect roughly 8.2 wet days totalling 80.4mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Plano is March–April.
Based on RICHARDSON, TX US (4.9km), 1995–2024. 19 years of December data.