It's the 3H's Today

English has a lot of expressions, so I sometimes feel that "English is Greek to me." :)

Do you know this expression?: it's the 3H's today. When I heard that at first, I didn't understand it at all. Therefore, I would like to let you know it.

3H's means "Hot, Humid, and Hazy." Now, you maybe say "Aha." :) If you listen to this expression later, don't think that it is Gibberish to you as I felt at first. :)