As a family that has a large telescope stored in the garage we define seasons astronomically lol!
No “summer” hot weather yet here in the East Bay of California but it is warming up. The hottest weather will be in September or October but I lived through many of those blazing hot, humid summers in Illinois and Atlanta. Also very hot, dry ones in inland S. Cal. Part of me misses the typical US summer weather and the rest is grateful not to have it as we do not have air conditioning in this new house.
So what makes you think of summer? Swimming, running through sprinklers, playing kick the can at dusk, and picnics at a lake were childhood favorites for my brother and myself. As an adult it is going to the beach, BBQs, fireworks, watermelon and more.