Planning for the weather is an important factor for making your trip to Valle di Casies a success, especially when you’re splurging. The hottest months are usually July and August with an average temp of 54°F, while the coldest months are January and December with an average of 24°F. The snowiest months in Valle di Casies are February, January, April, and December, with each month seeing an average of 142 inches of snowfall.