Winters in Grevenbroich are chilly, with temperatures often below freezing point, but can occasionally rise to around 20°C in February. Spring is marked by rising temperatures, reaching an average of 10°C in May and a high of 26°C in March. Summers are mild, with temperatures rarely exceeding 28°C, while autumns see a gradual cooling trend. The coldest months are January and December, with averages around 1-4°C, and the warmest month is June, averaging 18°C.