12F with a "realfeel" of -11f isn't bad.
It isn't quite shorts and a t-shirt weather, but it's not cold enough for me to be uncomfortable with regular shoes, jeans, and a heavy jacket.
Drop the temperature about 20 to 30 more degrees, and then a hat and gloves are mandatory, and drop it another 20 to 30 more degrees, then another layer or two is necessary
Drop it any more below that, however, and to be comfortable it takes thick mittens, long underwear, full snomobile suit, scarf, hat, blablabla ...
I'd prefer for the temperature to stay above -20, or for the "realFeel" to stay above -40. With a few layers on, and a hat and gloves, as well as a decent pair of boots, then I can get pretty comfortable. Any colder than that, and I just don't have the gear to be comfortable.