Sound and light

It's amazing how much the weather impacts what you see and hear when you're out and about, and I mean out and about outside the confines of a vehicle. 

Back in the day, when I still had a job and didn't have the option of walking the dog at noon, and when they still had regular flights to Toronto from Thunder Bay and the Soo, you'd hear this propeller airplane overhead every morning around 7:15. It was a regularly scheduled flight, so I'm sure it went by at about the same altitude every morning, but some days it sounded like it was 100 feet overhead, and other times you couldn't hear it at all. 

Same with the passenger jets. There's not a lot of them anymore either, but, depending on weather conditions, they can be either totally silent, or sound like a B-52 coming in low and slow.

Weather determines what you see as well as what you hear. I come out the Grey Road 1 from Owen Sound almost every day. When you're going by the Kemble look-out, you can see Christian Island, a good fifty miles distant, clear as day. Sometimes.

Other times, you can't see it at all. 

Much depends on weather.