Winter. Not only to add on to the amazing feelings that Neo already described above, but it's freaking cold! That's honestly the best part for me, because I can tolerate the cold a heck of a lot better than I tolerate the heat in any way. Plus, it's so comfortable to sleep in the cold, because you're all wrapped up in your blanket and you feel warm and all (especially if you turn on a heater) and it feels like heaven, omg. @_@