Not a single moment, but there is a temperature and humidity level, usually in the mid-to-late Autumn that I love. It is the point at which I can, but don't necessarily have to, wear a light sweatshirt/jacket and where I want nothing more than to be stretched out in a hammock in the mountains. Usually, the humidity is low from a recent rain that left the sky and everything brighter and almost like you're viewing the changing leaves in HD.