Here its possible to have a coop with the South-East completely open with hardware cloth and a little overhang if the other 3 sides are closed. No need for any other ventilations openings.Northerly winds are colder but other than that we get weather from every direction here. There might be more wind or rain from a certain direction but you can't just build things with no protection from the weather on one or two sides, for example.
About 100 years ago the commercial chicken keepers build their coops like that.
Plenty of light and ventilation there! 