December in Barnsley averages a daily high of 7.6°C with nights around 2.5°C. Expect roughly 17.6 wet days totalling 87.3mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Barnsley is June–September.
Based on SHEFFIELD, UK (18.8km), 1995–2024. 30 years of December data.