Ok, I was looking for a chart telling me the total hours of daylight per day. Didn't find that, but found a site that tells me sunrise and sunset times for any place in the USA. So I still have to do the math. Anyway looking at their site showed a lot of interesting stuff. They have a small plug-in you can install onto your computer to see it for each day. Or you can print a monthly chart for your town. Way cool, love it, and now I know how much light I may have to add in winter so they continue to lay.