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 71°F, while the coldest months are January and December with an average of 30°F. The snowiest months in Sandy are April, January, March, and February, with each month seeing an average of 10 inches of snowfall.