Winters in Hanover are cold, with temperatures often dropping below freezing and averaging around 0°C. Spring arrives slowly, with temperatures gradually warming up throughout March and April, eventually reaching averages of 8-12°C by late April. Summer is mild to warm, with temperatures rarely exceeding 35°C, and averages ranging from 23-24°C from June to August. Autumn brings a slight cooling trend, with temperatures dipping back down to around 6-20°C by September, before finally dropping below freezing again in November.