December in Norman averages a daily high of 11.1°C with nights around -0.9°C. Expect roughly 5.7 wet days totalling 44.7mm. Generally workable, with some weather to plan around.
Across the year, the best time to visit Norman is March–May.
Based on NORMAN 3 SSE, OK US (4.6km), 1995–2024. 23 years of December data.