Weather is probably a major factor when you plan your trip to Lebanon, 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 76°F, while the coldest months are January and February with an average of 34°F. The snowiest months in Lebanon are January, December, March, and October, with each month seeing an average of 7 inches of snowfall.