Reston's winters are generally cold, with temperatures often dropping below freezing and averaging around 2°C. Spring brings gradual warming, with March marking a significant increase in temperature, averaging 9°C, while April and May continue to rise, peaking at an average of 17°C. Summer months, June to August, experience warm temperatures, with July and August averaging around 25°C, while September's warmth begins to wane. Autumn sees a return to cooler temperatures, November and December averaging around 7°C, with occasional warmer periods.