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 66°F, while the coldest months are February and January with an average of 26°F. The snowiest months in Stanwood are January, March, December, and November, with each month seeing an average of 12 inches of snowfall.