[ghaff]

Wind chill is a mostly stupid number that weather reports like to trot out so they have a amped up "wow it's really cold" factor. Yes, a number of factors p[lay into our subjective perceptions of temperature but you're probably not walking around in a bathing suit when it's below freezing with a howling wind.

[bangkoksbest]

Sure, same with heat index. They are tools for communicating the impact of additional axes (wind speed for cold and humidity for heat) on subjective perception. I won't wander out without a scarf, or neck covering, if it's freezing and 40mph winds, but I don't mind to if it's freezing and no wind.

[Sebb767]

I don't think they are aiming for the wow factor. Most people arguably watch the weather report to find out how cold or warm it feels outside, which heat index and wind chill are far better at reporting.