Most of my actual learning took place during the summer. The busy work of school finally out of the way, I was free to tinker uninterrupted. I remember one golden summer just out of 5th grade with a C64, 300 baud modem and a stack of books on basic that changed the course of my life.
I read a article somewhere (here?) that most of the difference in educational achievement between low income kids and middle class kids was explained by summer vacation. Middle and upper income parents kept the teaching going in the summer.