Winters in Tsubame are generally mild, with temperatures rarely dropping below freezing and averaging around 3-6°C. As the season transitions into spring, temperatures gradually warm up, reaching averages of 9-11°C by March and April. Summer brings hot and humid weather, with July and August often seeing highs above 30°C and averages of 26°C. Autumn is characterized by a gentle cooling, with temperatures returning to more moderate ranges by October, averaging around 17°C.