Why can't I have my hair cut on the solstice in summer?

The reasons why you can't get a haircut during the summer solstice are as follows:

1, by the summer solstice solar term, it is midsummer and the weather is hot, so it is unbearable for most people to ignore their heads. 2, but friends with short hair, especially men, don't shave their heads to avoid ultraviolet rays burning the skin.