My mother, who lived in PA most of my life, called these birds snowbirds. I've noticed that even here, when the weather is cold, I see a junco or two around the feeders. Be safe with more snow and keep warm.
Gorgeous! For the first time, I have these little darlings on my patio and front porch (our neighborhood is ice/snowed in, so I'm just pitching the food out the doors) I'm not familiar with the Juncos and looked it up this morning - then talked with my neighbor who confirmed them. Hope to get at least one photo soon.