Maybe.with the window being in the opening next to where your arrow is (to the left of it) and the roosts and nest boxes being on the opposite end would it be ok to leave windows open 24/7 in the winter in Mass?
Might depend on the weather, best to have windows that can open just a bit or more.
Only way to know if things are too drafty is to stand in the spot you are concerned with during high winds and see(feel) what it's like there.
Air movement is fine, but if it's strong enough to literally ruffle feathers of a bird on the roost than it's too much.
You're not going to want snow blowing into the coop, best to keep it as dry as possible.
Amount of 'adequate' ventilation can also depend on how you manage your water and manure. I use poop boards cleaned daily and a 'sealed' heated waterer with horizontal nipples, these cut down on the moisture and ammonia in the coop.
Tho the humidity(and temp) inside the coop is rarely lower than what it is outside the coop.