January in Hannover averages a daily high of 4.5°C with nights around -0.4°C. Expect roughly 15.5 wet days totalling 51.3mm. A hard month to visit for comfort alone.
Across the year, the best time to visit Hannover is May–September.
Based on HANNOVER, GM (11.2km), 1995–2024. 30 years of January data.