Hello there,
I too am kinda new to this site. I have only been doing the chicken thing for a few months and up until a few days ago....before the cold snap came along, I was getting 2-4 eggs our 4 hens. I might do the chalk dusting method to find out which one is slacking.
They all seem to be taking the cold snap in stride. They are out when I get home from work about 3:00 pm and don't act any different. The eggs as you can guess are frozen by the time I get home...been feeding those to the dog...she loves it.
I just put in a coiled rope light under a paper bag to heat the nesting box, we will see this afternoon if they use the box today.
Pictures to come later.