December in Carlisle averages a daily high of 7°C with nights around 0.5°C. Expect roughly 18.6 wet days totalling 113.1mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Carlisle is June–September.
Based on NEWTON RIGG, UK (26.9km), 1995–2024. 25 years of December data.