December in Louisville averages a daily high of 10°C with nights around 0.8°C. Expect roughly 12 wet days totalling 114.6mm. Demanding conditions — pack for it and plan indoor options.
Across the year, the best time to visit Louisville is April–May.
Based on LOUISVILLE MCALPINE, KY US (3.8km), 1995–2024. 14 years of December data.