Kamariny Track, Kenya. This is where the fastest runners in the world train.
You don’t need any kind of special equipment, you just need to be consistent.
Alright, although I don’t live in the USA so that’s a little unusual temperatures for me
Obviously the US is huge, it depends on where you are. On average though I’d say most of the US population gets above 80 deg in the summer.
I don’t know much about temperatures but that sounds about right