In Posadas, Argentina, winters are mild with temperatures ranging from 2-16°C, while summers are hot and humid with temperatures often reaching up to 38°C. Spring and autumn seasons have moderate temperatures, typically between 10-30°C, with April and September being the coolest months of these periods. The summer season starts in December and ends in February, with January and February being the hottest months, averaging around 27°C. Autumn begins in March, bringing slightly cooler temperatures, while spring returns in September, marking a gradual increase in temperature.