this song is amazing. they are comparing phases of a relationship to seasons. summer is usually associated with fun and sunshine, which is like the first few phases of a typical relationship (going on dates, enjoying each other's company) but then when it all goes to shit.... and the weather gets colder (autumn comes) . Autumn is beautiful because of the scenery and the hint of colder weather, but at the same time the beauty and sadness of summer turning into autumn is similiar to the end of a relationship where you reflect on how amazing it was, but come to terms with the end of it.
this song is amazing. they are comparing phases of a relationship to seasons. summer is usually associated with fun and sunshine, which is like the first few phases of a typical relationship (going on dates, enjoying each other's company) but then when it all goes to shit.... and the weather gets colder (autumn comes) . Autumn is beautiful because of the scenery and the hint of colder weather, but at the same time the beauty and sadness of summer turning into autumn is similiar to the end of a relationship where you reflect on how amazing it was, but come to terms with the end of it.