It's called intense and total apathy, a little bit of sensory overload into numbness, and a final dash of "my body spends more energy on body heat than usual for arbitrary reasons".
There are some factors at work
40 degrees f. With no wind and sunny, I'm gonna grill in shorts and t shirt.
40 degrees f. With overcast skies and a constant breeze, sweater, jeans and I had better be moving.
40 degrees f. With no wind and sunny, I'm gonna grill in shorts and t shirt.
40 degrees f. With overcast skies and a constant breeze, sweater, jeans and I had better be moving.