Everything affects the way the hens lay. Wind, rain, cold. In the winter, the light, the sunlight. You have shorter days. That affects their laying.
This year we helped my chickens along a little bit. We improved our chicken house. We have an insulated chicken house and I have a little heater that I leave on for them, and I didn't realize that they would take to that heater so well.
They, a lot of times you go in the afternoon when it's 38 degrees outside, and they're nestled around that heater. Yes, the weather affects the laying.