Chico's winters are mild, with temperatures ranging from around freezing to the mid-20s Celsius, averaging around 10°C in January and December. As spring approaches, temperatures gradually rise, reaching an average high of 18°C in April and May. Summer months bring warm days, often reaching highs above 40°C, while nights remain relatively cool. Autumn is characterized by a return to mild temperatures, with averages dipping back down to around 10-12°C by November.