You might spend a lot of your vacation inside, but if you want to see more of the area, looking at local weather trends is a good idea. The hottest months are usually July and August with an average temp of 53°F, while the coldest months are December and February with an average of 14°F. The snowiest months in Banff are February, March, December, and November, with each month seeing an average of 8 inches of snowfall.