For me, ever since my own childhood, lilacs in bloom (and that scent in the air) is very much associated with the beginning of summer. This week in June is also the end of the school year in Sweden; and the beginning of the summer holidays (for the children lasting from now until mid August or so).
Summer gathered in the weather, the wind had the proper touch, the breathing of the world was long and warm and slow. You had only to rise, lean from your window, and know that this indeed was the first real time of freedom and living, this was the first morning of summer.
~Ray Bradbury, Dandelion Wine~