average monthly temperature in buenos aires argentina
1 Average monthly temperatures have a range of 13.5 C (24.3 F) which is a low range. 2  There is a range/ variation of mean diurnal temperatures of 9.3 C (16.7 F). 3  January is the hottest month (fairly hot) with an average temperature of 24.5 degrees Celsius (76.1 degrees Fahrenheit). Average monthly temperatures have a range of 13.5 C (24.3 F) which is a low range. 2  There is a range/ variation of mean diurnal temperatures of 9.3 C (16.7 F). 3  January is the hottest month (fairly hot) with an average temperature of 24.5 degrees Celsius (76.1 degrees Fahrenheit).