Like I said earlier - we have absolutely no problem being "freezing" when the AC is set to 72F and sweaty hot when it is 80F. That's only an 8 degree range between extreme levels of comfort - yet we still don't feel a need to introduce half-degrees in order to define our sweet-spot.
Having 35 different degrees to define the difference between freezing and a hot 95F is more than adequate when you are looking at atmospheric conditions. You actually only need 6:
1) Winter parka Weather
2) Sweater Weather
3) Windbreaker/sweats Weather
4) T-shirt weather
5) Shorts Weather
6) As naked as the law allows weather