In cold climates a beard is like a sweater for your face, you literally will not feel as much air movement. During the hotter months it doesn't seem to bother me that much to be super noticeable. What does bother me is when it keeps catching food when I'm trying to eat. That is about the time I shave it.
I think it depends on the person. I've had people tell me a beard would really suite me (after a few days of not shaving) but I don't think I could ever let it grow out. After a few days it drives me nuts!! Itchy, scratchy... I just gatta shave it off lol.