How does latitude affect fall & winter laying

Today I got 3 eggs out of 4 (possibly) 5 layers. This is a bit unusual; lately I've been averaging 2 a day, but a couple of weeks ago it was 3 a day.

I wonder if I'm beginning to see a reduction in egg production because of the increasingly shorter days. I live in San Francisco so I'm not sure how the shorter winter days will affect laying at this latitude compared to somewhere more far north, let's say in Seattle or Vancouver BC.

Now that we're on regular time, it gets gets light at about 7 AM & dark at around 5 PM. I usually let the girls out around 7 AM; but sometimes I oversleep.

Would shifting the position of the hen house to let more light in make a difference? Right now the window faces west toward a wall and I wonder if turning it towards the east or south to let the girls get a bit more of the morning light would help keep egg production from falling so low.