December in Chelmsford averages a daily high of 8.3°C with nights around 2°C. Expect roughly 15.1 wet days totalling 57mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Chelmsford is June–September.
Based on WRITTLE, UK (2.7km), 1995–2024. 29 years of December data.