Answer: the cool breeze blowing through as I stood waiting for the train. A sign that, even if the afternoons are still creeping up into the low 90's for the next few weeks, summer is beginning to die, and the coolness of autumn approaches.
Eliot wrote that April is the cruellest month. He's never been through August in Houston.
Bring on the cold...er, cool... uh, mild temperatures!
That's CHANGE i can believe in. (Couldn't resist.)