The Summer I Turned Pretty by Jenny Han

Belly measures her life in summers. Everything good, everything magical happens between the months of June and August. Winters are simply a time to count the weeks until the next summer, a place away from the beach house, away from Susannah, and most importantly, away from Jeremiah and Conrad. They are the boys that Belly has known since her very first summer—they have been her brother figures, her crushes, and everything in between. But one summer, one terrible and wonderful summer, the more everything changes, the more it all ends up just the way it should have been all along.

The summer I turned pretty part one

It’s not summer without you part two 

We’ll always have summer part three