Tateyama's winters are cool and unpredictable, with temperatures fluctuating between -4°C and 18°C in January. As the season progresses into February and March, temperatures rise steadily, reaching averages of 9°C and 13°C respectively. Spring arrives in April, bringing mild temperatures ranging from 7°C to 24°C, while summer months of June to August are hot and humid, with averages between 22°C and 27°C. Autumn sees a return to more moderate temperatures, similar to those experienced during the spring, before dipping into cooler winter conditions again by December.