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you can lock this thread up after this response. nailed all of it.There are literally hundreds of threads on this topic.
In a nutshell:
Provide a large area that is protected from snow/wind for the chickens to use during winter if you are in the north with regularly freezing temperatures. I think the often quoted 10 sq ft per bird in the run is too small and prefer a minimum of 15 sq ft.
Having adequate ventilation in the coop during freezing weather is something most new chicken keepers severely underestimate the importance of. You need to think in terms of square feet of ventilation oriented in such a way to allow/promote air flow through the coop to remove moisture laden, stale air to prevent frostbite and keep the air quality good.
I wouldn't bother drying a wet chicken coming in to roost for the night. They generate enough body heat that they will be dry and fluffy by morning if the coop is properly ventilated.
Something else to consider is that chickens generate body heat throughout the night by slowly digesting the contents of their crops. That is why it is important that they go to roost with crops full of a balanced feed and why it is so important that they be able to eat very soon after coming off the roost with empty crops in cold weather.
Lots of fluffy dry bedding to hunker down in on brutally cold days is always appreciated.
Keeping thawed water available during waking hours and preferably outside of the coop if the water source is open is very important as well.
The key is to keep things DRY and keep drafts off the birds that are strong enough to blow open their feathers. When it's cold they fluff up their feathers to trap their body heat. As long as there is no moisture to condense on their exposed skin (combs/wattles) and no air to open their feathers and blow away their heat, they do quite well in very cold weather.