Weather is probably a major factor when you plan your trip to Watson Lake, but bear in mind that cheaper options are usually available when the weather isn't as good. 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.