First timer here in Adirondack Mtns, upstate NY.
Got 21 mixed breed chicks in March. Once they started laying, around August for most, we would get 10-14 eggs daily from the 19 that survived. It was actually shocking as about half were chosen for looks and not egg-laying ability. Pets with benefits, more or less.
With the cold weather, many days temps have ranged from teens to high 20s, and we still get 4-7 per day with zero heat, zero added light, and no increase to the amount of food given. In fact, the coop and run are now covered in a metal roof entirely so it is noticeable darker inside during these short northern days, and they are eating less now that I feed them a measured amount daily and don't use the PVC tube feeder system which is meant for times we can't get to them daily (fan of Justin Rhodes here, learned I was overfeeding by a LOT!). They're even molting through this all, as evidenced by the feathers everywhere when I go in to scrape the poop boards each morning. I thought molting would slow them down but doesn't seem so.
I am eating mostly only whites, feeding cooked yolks back with layer crumble and grains and kitchen scraps. This means that every week I use a bit more than two dozen. Wife bakes with some. We give away to family/friends when we can (not as often as hoped, thanks to COVID). And because that leaves us with lots extra I'm water glassing and have 2 full 5 gallon buckets already.
So from our experience I'd say that it depends partly on how happy and healthy your birds are, partly on the science, and partly on luck. I love interacting with my birds, sit and have lunch or coffee in the covered run with them, hold and pet them, talk to them, etc. Compared to others we know who have free range flocks they seem to just "let go", or flocks that get feed and water and not much else, we have better looking, more active, friendlier birds and by all reports more eggs. Will be interesting to see how the second winter compares, since I read that first year layers produce more through winter anyway.