Weather is probably a major factor when you plan your trip to Cranbury, 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 73°F, while the coldest months are January and February with an average of 36°F. The snowiest months in Cranbury are February, January, March, and April, with each month seeing an average of 5 inches of snowfall.