Something you only really notice when cycling is localised air temperature changes.
The most common are in the summer as you pass through shady bands of coolness. But I had an odd one this morning. It was cold - just above frost - until I came to the low lying point where I cross a small river that enters the sea. It was suddenly very (relatively) warm and very moist - my glasses steamed up.
Shame the warmth doesn't extend to the point where I came off on ice a couple of years back.