Planning for the weather is a good way to make your trip to Haller relaxing and enjoyable, especially when you’re splurging. The hottest months are usually July and August with an average temp of 56°F, while the coldest months are February and January with an average of 28°F. The snowiest months in Haller are April, May, November, and January, with each month seeing an average of 5 inches of snowfall.