Time of year absolutely. When mine “molt” their egg production goes down like 75%. Also things like thunderstorms, random events like predators(dogs) disturbing them affects egg production. Basically, happy chickens give the best results. Now I’m in Tennessee, so my chicken coop is more designed for warm months. If you’re up north, you would need to invest in a more cold design. Chickens don’t need much tho. They can handle cold weather a lot better than warm weather. And in most situations, heat kills chickens much more than cold weather. Their basic body temperature is like 105 degrees. But if you’re in sub degree temperatures, might need some covered insulated designs, wind blocking openings, etc, and anything that can keep their water from freezing. Low 30’s is fantastic for winter temperatures. They love it. Keeping a chicken acclimated to its environment is important. You don’t want a 50 degree coop, in a 2 degree outside weather. They won’t come out. So if your those kinds temperatures on a regular basis, even 30 degrees may be to high. Go with low 20’s maybe. But keep a fish tank heater in the water. Windows and openings are ok, but be mindful of location. If they are around the egg nest, seeing leaves drop or bugs flying around will disturb them and could hurt production. That’s their alone time. 😁