Odd laying behavior during extreme cold, is this normal?

[RootedTogetherHomestead]

So here in NE Ohio, it has been EXTREMELY cold, like 0 to -1 last night and inside their henhouse stayed about 10-13F. We were outside by 8:30 this morning to give warm mash/oatmeal, water, and check on everyone. Everyone was active, foraging, eating, acting like normal chickens... we noticed an egg (broken and not frozen) in the henhouse underneath the roosting bars by one of the barred rocks.. later today we found 2 more barred rock eggs, so someone laid two eggs today (we only have 2 barred rocks). And, our EE egg looks strange compared to her normal. Should we be concerned or is this normal cold weather/change stress behavior?What should we watch for? TIA.

 

[Bawkbok]

Those eggs look normal. The blue one has some calcium deposits on the shell, not uncommon. You don't mention their ages so if they are pullets new to laying it might take them a bit to regulate so anomalies can occur.

Offer oyster shell and grit on the side in separate containers from the feed. This should be available at all times.

The broken egg might be because someone stepped on it.
Cold doesn't impact egg laying, it's the length of daylight hours that impacts production cycles.