If you're looking forward to lots of outings with your partner, take a look at these details about year-round temperatures in Watson Lake: The hottest months are usually July and June, with an average temperature of 13°C, while the coldest months are December and January, with an average of -15°C. The snowiest months in Watson Lake are January, November, December and February, with each month seeing an average of 33 cm of snowfall.