ELi5: Why does the weather feel much colder when the sun is out with a high UV index in the winter?

Question

ELi5: Why does the weather feel much colder when the sun is out with a high UV index in the winter?

In: 7

Answer 1

Cloudless nights let heat escape into space, so the temperature plummets in the winter when it’s clear at night. Then it’ll be really cold the next day even though it’s sunny.

Then you get into a vicious cycle where cold temperatures suck out all the moisture and stop cloud formation, cooling you further.