"Wind chill factor" - almost meaningless, except for people who want to proclaim how cold it is. It's not a matter of being that cold - it's a matter of being inappropriately dressed. If you don't have bare skin exposed, the wind chill factor is pretty irrelevant.
Well, it does also affect how quickly a bucket of water will freeze. I hate when it's this cold - it adds at least an hour to how long it takes to do chores (giving all the goats water). And, it does take a couple minutes longer getting dressed to go outside for an extended period of time (1 1/2 hours lately). But, except for my gloves being momentarily wet last night (followed by frozen, followed by *very* cold fingers - half an hour later, the 35 degree water from my faucet felt warm), I almost never come back into the house saying, "wow, I'm cold." I'm generally quite comfortable outside the entire time, regardless of how cold it gets. Same cannot be said for very hot & humid days.