The problem with high humidity is that your sweat does not evaporate, which is what cools you. Then you overheat.
The problem out here where it's very dry is that you don't feel as hot since your sweat evaporates quickly, but you dehydrate quickly. It can sneak up on you too.
The problem out here where it's very dry is that you don't feel as hot since your sweat evaporates quickly, but you dehydrate quickly. It can sneak up on you too.