There isn't a place on Earth that gets cold enough that you can't put on enough clothing to make it surviveable for a few hours.

The human body is endothermic. It regulates it's own temperature by burning energy to create heat, but it doesn't have a mechanism to cool itself in a humid environment.

At high humidity, 95 degrees can be lethal to a hydrated, healthy adult.

Last summer we 45 consecutive days over 100 degrees in a very humid climate.