The last couple days have seen low temperatures in the high 60°s. I was actually chilly on the first part of my bike ride to school today. There's a definite undertone of a chill in the warm, moist air. It's interesting how just a little hint of relief makes all the heat seem so substantially reduced.
I'm not sure what causes this barely perceptible difference in the air. You just know that the chill is there. I think of it as scattered pockets of molecules with lower kinetic energy..maybe it's actually a smell that triggers the colder feeling. Who knows? Anyway, I'm not looking forward to the day I have to put on boots and a jacket to ride to school.