Helpful - I was just going off the weather report which said 100% humidity and my little probe in the Chicken Palace that said 95% humidity.I don't think you can get 100% humidity when it is cold enough for the moisture in the air to become snow crystals. Maybe with a weather inversion (cold air above warm air). The temperature would have to be very, very cold and the environment the chickens are in fairly air-tight. Then the humid air of their breath and moisture from their skin could be a problem. Your Palace doesn't look poorly-ventilated, and it's not a very cold storm. Your roosting area so large (holds 40 birds, doesn't it?) , there must be gently moving air through there. That room would have to be really air-tight to collect enough moist air from their body heat to be a problem, and the temperature would have to be very cold.

For sure there was air flow - enough to bring some snow in!
I am reassured that you all think it will be fine. Hope so!