I made an interesting observation like that this spring.
We had a fire in the Shawnee State forest (burned 3,000 acres). The fire was above me a few miles. Through the day, you couldn't tell the fires were burning. But when I would get up in the morning, you could smell and actually see the smoke in the air.
Moral of the story? In hill country, at night when the air cools it sinks into the hollows and valleys and flows down hill, just like water. That's a good thing to keep in mind when you're choosing set location.
Endeavor to persevere.