If you’re looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Whitehorse: The hottest months are usually July and June, with an average temperature of 11°C, while the coldest months are January and December, with an average of -14°C. The snowiest months in Whitehorse are January, December, February and November, with each month seeing an average of 62 cm of snowfall.