Live up in Northern Alberta, Canada. First winter with chickens, at least 2 of my hens have just started laying. Had to go to town yesterday around 2:45 p.m. and before I left, I checked the coop, and collected 1 egg. I was back home at 6:30 p.m. and went to check on my chickens and in the first laying box right by the door was another egg! Frozen and cracked. It was not there when I left earlier. Only have an 60 watt light on during the day and really don't want to supplement with an heat lamp. We up here can get mighty cold during the winters and if the weather at the moment is mild (only around -12), what is going to happen to the eggs at -30!!!! Help, what am I doing wrong!!