Got up this morning and decided to check on the chickens. I normally feed and water at night, and then don't see them again until after work. But since it is snowy and blowing I thought I'd look.
I found all their pens and the entire north half of the barn had a pretty good dusting of snow, including on the backs of all the birds on their roosts. Ugh. I realized it was coming in because the wind was blowing from the North and Northeast. My barn has two doors on each side, and I always leave the Northeast door open to let light in the barn (and because the wind never blows in there....or so I thought). So a lot was coming in there, but not enough to reach the pens. The North wind was blowing right against the north side of the barn and blowing snow through the barn slats and in the pop doors of the pens.
Soooo, at 5:30 in the morning (who said chickens weren't all fun and entertainment!), I was screwing plywood onto the north side of the barn next to each set of roosts, and also putting plywood over each pop door. It definitely cut down on the drafts into the pens, and I'm not worried about closing off the pop doors, since the chickens won't go out into the poison white stuff anyway. I'm wondering if this contributed to my frostbite problems during the last cold snap. I'm hoping this helps with the coming freeze. I also closed all the barn doors, which meant I had to leave the lights on, or it stays pretty dark in the barn all day.
Back in BC (before chickens), my biggest worry was if I had clean clothes to wear to work. Now, I'm up half the night hoping they aren't freezing and then doing construction before hurrying to work. And I'm not as worried about clean clothes either.....
You are a good person to worry so much. Glad you figured out where the wind was getting in. Hope it makes a difference!