[RegulatorCountry]

Tanning evolved for humans so that when ultraviolet B radiation increases in early spring, the skin gradually darkens. As the sun becomes stronger, the tan deepens. During the winter, as ultraviolet B wanes, so does the tan,

One of the worst sunburns I've ever gotten on my face occurred in the dead of winter, on a ski slope. This is not uncommon. "Tanning" also occurs due to wind and cold.

Either someone is not very good at explaining themselves, or the theory needs work.

[allmendream]

Wind and cold?

LOL!

Try “the reflection of the sun off the snow” and you will be closing in on the truth.