The same kind of discussion about color for hulls occurs with motorcycle helmets. I'd get that question a lot when I was teaching riding courses here in Virginia. Some said black full face helmets are hotter, where others argued that color made no difference. To find out, experiments were conducted though the data points were small. I guessed that it would not matter since there is a good bit of insulation
inside the shell that rests between the rider's head
and the outside of the helmet. Outside, sure, the darker one could be hotter (more on that in a bit).
Inside Results: nope. There was no discernible difference on the inside temperature readings. The tests were achieved by placing a black, an arrest me red, and a white helmet in the summer sun and leaving them sit there for hours. We put handy mercury
thermometers inside and closed the full faced lids leaving them pointed towards the shadows. The tests were repeated over the course of a few weekends and the thermometers were swapped between the lids.
It turned out that color didn't matter but leaving the helmets on the parking lot caused them to be a lot hotter than when they sat in the grass
. The official (highly calibrated) blind touch test showed that black helmets were warmer to the touch than white though. We had the students close their eyes and feel both and say which one if either felt warmer. Sometimes we would present them with the same lid just to test their honesty. This was done in full view of the other students so, they knew we were being tricky...
I own black, red, and white helmets but tend to choose the black one most often just because I like the look.