Weather will likely play an important role when you plan your trip to Imperial, 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 February and January with an average of 16°F. The snowiest months in Imperial are March, January, November, and April, with each month seeing an average of 12 inches of snowfall.