Very cold wind here but i think i saw a biker wearing a face mask not a bad idea as that wind freezes ones face, cycling clothes are fine for everything else but how does one keep that wind off your face . . .
I cycle backwards. In all seriousness though on the coldest days if I'm planning/expecting to go slow I'll wear a buff too but I hate having anything cover my mouth or nose if I'm putting the effort in.
There are some properly cracking designs for full on face masks out there. I've been scanning Amazon for a bit. There's one neoprene face mask that makes it look like the skin has been removed from your face. That should be good for a laugh