Modesto's winters are cool and mild, with temperatures often below freezing in January and December, but also experiencing warmer days. Spring arrives in March and April, bringing gradual warming to highs around 28-32°C, while summer months of June to August see peak heatwaves, with temperatures frequently reaching above 42°C. Autumn is similarly warm, with October and November temperatures mirroring those of spring, before cooling down again as winter approaches.