Fresno's weather is characterized by mild winters, with temperatures ranging from just below freezing in January and December to a relatively balmy average of around 11°C in February. As spring approaches, temperatures rise steadily, reaching averages above 18°C in April and May, with occasional heatwaves pushing into the mid-30s. Summer months are warm to hot, with July being the hottest month on average at around 30°C, but even then, nighttime temperatures rarely dip below 14°C. Autumn brings a return to milder conditions, with averages dropping back down to around 17°C by October, before cooling further in winter. Overall, Fresno's climate is marked by relatively small seasonal temperature fluctuations, with the biggest differences seen between summer and winter months.