If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Cotopaxi: The hottest months are usually July and August, with an average temperature of 16°C, while the coldest months are January and December, with an average of -6°C. The snowiest months in Cotopaxi are March, February, January and November, with each month seeing an average of 29 cm of snowfall.