Winters in Round Rock are cool, with temperatures often below freezing, but also experience mild days. Spring is a period of rapid warming, with temperatures rising by an average of 10°C over the first four months. Summer is hot and humid, with temperatures frequently reaching above 30°C, but with little variation throughout the season. Autumn brings a return to cooler temperatures, with some chilly days, but overall mild conditions persist until winter sets in again. The temperature fluctuations are relatively small during the summer and autumn months.