Weather is probably a major factor when you plan your trip to Castile, 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 January and February with an average of 28°F. The snowiest months in Castile are January, March, February, and December, with each month seeing an average of 5 inches of snowfall.