I think itβs more due to light levels.
Discussion
Yes, daylight is the biggest factor. I've been tracking my egg productivity for a couple years with an app I wrote. Dates are not on this data view, but the peak production is June/July and valleys are Dec/Jan.
Commercial laying chicken life expectancy is 2-3 years. Backyard chicken life expectancy is ~6 years with egg production lasting 3-4 years.