Although weather is just one factor, it can really affect your travel plans, especially when you are planning a longer stay in La Plata. The hottest months are usually July and August, with an average temperature of 23°C, while the coldest months are January and February, with an average of 0°C. The snowiest months in La Plata are January, November, February and December, with each month seeing an average of 13 cm of snowfall.