If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Haines Junction: The hottest months are usually July and August, with an average temperature of 9°C, while the coldest months are January and December, with an average of -16°C. The snowiest months in Haines Junction are February, April, December and March, with each month seeing an average of 62 cm of snowfall.