Chichibu's winters are chilly, with temperatures often dropping below freezing in January and December, averaging around 4°C and 6°C respectively. Spring brings a gradual warming trend, with temperatures rising to an average of 14°C by April and peaking at 26°C in May. Summer months see scorching highs, with July and August often reaching over 35°C, but also experience some cooler days. Autumn is mild, with temperatures dropping back down to around 10-15°C by November, before the chill of winter returns.