Winters in Itabashi are typically mild, with temperatures rarely dropping below freezing and averaging around 4-7°C. Spring brings a gradual warming trend, with temperatures rising steadily from March to May, eventually reaching an average of 19°C by May. Summer is warm and humid, with temperatures often soaring above 30°C, especially in July and August. Autumn is mild and pleasant, with temperatures cooling down gradually from September to November, before the winter chill returns. The temperature fluctuations throughout the year are relatively moderate, with some months experiencing quite wide temperature ranges.