Hilden's winters are typically cool and unpredictable, with temperatures fluctuating between freezing cold and mild. January is usually the coldest month, with average temperatures around 3°C, while February can be similarly chilly. As spring approaches, temperatures gradually rise, reaching averages of around 7°C in March and April. Summer months bring warmer days, with June and July often seeing temperatures soar to around 20-25°C, although occasional cooler periods still occur. Autumn brings a gradual return to milder temperatures, but can still experience some chilly mornings, especially in October and November.