December in Grimsby averages a daily high of 7.3°C with nights around 1.6°C. Expect roughly 14.2 wet days totalling 53.7mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Grimsby is June–September.
Based on WADDINGTON, UK (59.6km), 1995–2024. 28 years of December data.