Weather is probably a major factor when you plan your trip to La Grave, 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 54°F, while the coldest months are January and February with an average of 24°F. The rainiest months in La Grave are December, May, June, and November, with each month seeing an average of 7 inches of rainfall.