Rosario's climate is characterized by mild winters and hot summers. The coldest months, May to July, have average temperatures around 11°C, with occasional drops below 0°C in May. Spring and autumn are pleasant, with temperatures ranging from 16°C to 29°C, while winter temperatures rarely dip below 10°C. Summer is the hottest season, with December being the warmest month, averaging 25°C, but also experiencing high highs up to 39°C.