Winters in Willich are cold and unpredictable, with temperatures often below freezing. As the season progresses, temperatures gradually warm up, but remain quite chilly throughout January and February. Spring arrives in March, bringing rapidly rising temperatures that can fluctuate wildly from day to night, sometimes reaching as high as 26°C. Summer is mild and pleasant, with July typically being the warmest month, although temperatures rarely exceed 28°C. Autumn brings a return to cooler temperatures, gradually decreasing throughout September and October before winter's chill sets in once again.