Porterville's winters are mild, with temperatures rarely dropping below freezing and averaging around 9°C in January. As spring approaches, temperatures rise steadily, reaching an average of 28°C by June. Summer months bring warm days, often above 40°C, but nights can still be cool, especially in July when temperatures dip to around 17°C. Autumn is similar to winter, with mild temperatures and occasional cooler spells, while the coldest months are December and January, averaging around 8°C and 9°C respectively. Spring and autumn are characterized by a more moderate climate, with average temperatures ranging from 12°C to 18°C.