This bird, and several others like it, were at the feeder during this morning's feeding frenzy. I believe it is a dark-eyed junco (Junco hyemalis). They were quite competitive and were constantly chasing each other from the feeder even when unoccupied perches were available. At some point, a male and a female cardinal joined them.
The juncos that were not at the feeder often sat in the snow covering the railing of the adjacent deck. Here is one that was all puffed up. It was indeed cold and windy.