I grew up in Florida, so wind-chill wasn't something I heard a lot about in my youth. When I moved to Boston to go to college, I found it to be a reasonably useful bit of info. If it's gonna be windy while it's cold, I might want a scarf for my face.
So, we're having a heat wave here in NY. Four days in a row in the high Nineties. Guess what. I don't need your friggin Heat Index or Real Feel temperature. Of what possible use is it to me to know that it's 97º but it feels like 6000º.
This is not helpful...keep it to yourself!