December in Welwyn Garden City averages a daily high of 7.7°C with nights around 2°C. Expect roughly 16.3 wet days totalling 67.6mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Welwyn Garden City is June–September.
Based on ROTHAMSTED, UK (38.9km), 1995–2024. 30 years of December data.