Chillan's climate is characterized by mild winters and warm summers. The coldest months, June and July, bring temperatures occasionally below freezing, with averages around 7°C in July. Spring and autumn are relatively cool, with April being the chilliest month, while September marks a gradual warming trend. Summer months from December to February offer pleasant temperatures, peaking at 36°C in January, but also experience cooler mornings and evenings. Autumn and winter temperatures often vary widely between day and night.