Winters in Coulsdon are typically cold and unpredictable, with temperatures often dropping below freezing point but occasionally rising above average. As spring arrives, temperatures gradually warm up, reaching averages of around 6-11°C by May, allowing for mild days to emerge from chilly mornings. Summer is generally warm, with July being the hottest month on average, while autumn brings a return to more variable and cooler conditions, often dipping below 4°C by November.