Weather is probably a major factor when you plan your trip to Mandarfen, 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 49°F, while the coldest months are January and February with an average of 20°F. The snowiest months in Mandarfen are April, May, November, and January, with each month seeing an average of 5 inches of snowfall.