Hattingen's climate is characterized by mild winters and warm summers. In winter, temperatures are often below freezing, with January averaging around 3°C and February averaging 5°C. As spring approaches, temperatures rise steadily, reaching averages of 7-12°C in March to May. Summer months bring warmth, with June to August averaging around 17-19°C, but temperatures can still drop to near-freezing on cooler days. Autumn sees a return to milder conditions, with September and October averaging around 16°C before dropping again in November and December.