Weather will likely play an important role when you plan your trip to Vaughan, but bear in mind that cheaper options are usually available when the weather isn't as good. The hottest months are usually July and August, with an average temperature of 19°C, while the coldest months are February and January, with an average of -3°C. The snowiest months in Vaughan are January, March, February and December, with each month seeing an average of 18 cm of snowfall.