User blog comment:Chaotic38/Estimated Choices Timeline/@comment-3452092-20181231034037/@comment-3452092-20190103053236

In addition to the above, apparently Endless Summer, Book 1 starts on June 1st, which being the June baby that I am, I can tell you is, ironically, not in summer, so technically Endless Summer, Book 1 takes place in spring, Endless Summer, Book 2 takes place in winter (as probably does book 3, but I will give you more solid info on that if I get it). So the "endless summer" refers not to actually summer, but instead summer vacation, which in the USA tends to start a month before actual summer does.