Weather will likely play an important role when you plan your trip to Andover, and keep 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 temp of 70°F, while the coldest months are January and February with an average of 33°F. The snowiest months in Andover are January, February, March, and April, with each month seeing an average of 6 inches of snowfall.