Jacob camps a lot, and is for the most part a more outdoorsy type than Dean is, so he’s more likely to tan (in addition to being Mediterranean, which helps his chances in the sun). Dean spends most of his days holed up in a room researching, with a good amount of his waking hours at night hunting spirits. He will burn quick before he tans if he’s not expecting it.

Sam will never let Dean hear the end of it, but he better keep out of the sun himself. All those years in the motel left him even paler than Dean, so he’ll burn faster.

Bowman would be very critical of all of this. People burning just from spending time in the life-giving sun?! It’s such a weird idea. Even knowing that sprites can get themselves dried out and overheated, he will be baffled. Of course, the shedding will have him wondering if they’re sick and need some kind of medicine. Dean would get such a Look for all of this.