Weather will likely play an important role when you plan your trip to Quincy, 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 65°F, while the coldest months are December and February with an average of 36°F. The snowiest months in Quincy are March, January, February, and April, with each month seeing an average of 35 inches of snowfall.