What Köppen climate does Buenos Aires, Argentina have? Buenos Aires has a Cfa climate, classified as humid subtropical.
Cfa describes a temperate climate with hot summers, no dry season, and sufficient summer warmth to meet the classification’s highest temperate-summer category. Buenos Aires has hot, humid summers with frequent thunderstorms and generally mild winters. Rainfall occurs throughout the year, rather than being confined to one sharply defined wet season.
The city’s climate is influenced by the South Atlantic High, which brings moist air toward the Río de la Plata region. In summer, strong heating over northern Argentina helps create the Chaco Low, reinforcing the flow of humid air and supporting thunderstorms. Atlantic influence also moderates both heat and cold compared with more continental locations.
Buenos Aires is often described more broadly as temperate or pampas climate, but those labels do not replace its Köppen-Geiger designation. The city can still experience extremes: its recorded high reached 43.3°C on January 29, 1957, while its record low was −5.4°C on July 9, 1918. These extremes do not change its overall Cfa classification.