Troisdorf's winters are typically cold and variable, with temperatures fluctuating between freezing and mild days. Spring arrives in late March and April, bringing moderate temperatures that gradually warm up, often reaching up to 20°C during the day. Summer months from June to August are warm and pleasant, with average highs around 18-19°C, although occasional heatwaves can push temperatures into the mid-20s. Autumn is similar to spring, with mild temperatures in September and October giving way to cooler days in November and December, ushering in a chilly winter once again.