Kumamoto's climate is characterized by mild winters and hot summers. January marks the chilliest period, with temperatures ranging from -3°C to 19°C, averaging around 7°C. As spring approaches, temperatures gradually rise, reaching an average of 13°C in March and 16°C in April. Summer months bring sweltering heat, with July being the hottest, but temperatures start to drop again in autumn, returning to a moderate range by November. Winters are relatively mild, with December averaging around 8°C.