Fontana's winters are mild, with temperatures rarely dropping below freezing and occasionally rising into the mid-20s. Spring arrives in March, but temperatures remain relatively cool until April, when they start to rise steadily, reaching averages of around 17°C by May. Summer is hot, with July being the warmest month, averaging highs above 26°C, although temperatures can soar above 40°C on occasion. Autumn brings a gradual cooling trend, with temperatures dropping back into the mid-teens by November and December.