I have two hens, rearing 3 chicks now, they're almost 3 weeks old. I have a hen gone broody on eggs, right now. Someone tell them they're not supposed to do that. They're not hearing me, or you apparently.
Wait two hens on eggs... A serama and a Barred Rock. The ones with babies are in the banty coop that has three heated areas, since I am also brooding/raising everything that hatched here in Oct/Nov. The barred rock is in the unheated, layer coop and the serama in a cage. Yes, they can brood a group of chicks in winter. No, the survival rate is often not as good as spring, summer, early fall. If they get chilled in a sudden storm when they're outside you often lose them if you don't find them quickly. But some do survive.
I have three, six, eight and ten and twelve week old chicks out there with access to heat. It's been in the teens for days. Not counting wind chill. I have to take out hot water every few hours so the smaller waterers don't freeze solid. Still the chicks are running around like madmen, and when they get cold, they run in to the heat. Voila, surviving smart chickens. Chickens that get cold and don't go back to the heat... die of stupid. A fitting end. The smart and tough make it, the dim don't. It works for me, they free range on nine acres and stupid never survives a year in any case.
Even the outdoor seramas are taking the weather well with access to the heated areas. As are the sizzles, silkies and bantam cochins. The Delawares don't care any more than the Rocks do about weather, they're adults.