Arlington Heights experiences a moderate climate with distinct seasonal variations. Winters are cold, with temperatures often below freezing, and occasional extreme lows around -23°C in February. As spring arrives in March, temperatures gradually rise, reaching averages of 6°C, and by April, they have warmed up to 9°C, marking the beginning of mild spring days. Summer months bring warm temperatures, peaking at an average of 24°C in August, while autumn sees a return to cooler temperatures, averaging around 16°C in October.