December in Bletchley averages a daily high of 8.5°C with nights around 2.5°C. Expect roughly 15.4 wet days totalling 68.5mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Bletchley is June–September.
Based on OXFORD, UK (44.4km), 1995–2024. 30 years of December data.