Yonezawa's winters are chilly, with temperatures often below freezing, but occasional warmer days allow for mild periods. Spring brings rapidly increasing warmth, with temperatures rising steadily from March to May. Summer is hot and humid, with temperatures frequently reaching the mid-30s Celsius by July and August. Autumn is a time of cooling, with temperatures gradually decreasing from September to November, although still experiencing some warm days. In winter, cold snaps are common again, but occasional warmer periods allow for relatively mild days amidst the frost.