[bspn]

The humidity amplifies the effects of the heat. I remember the first time I travelled to Arizona and was expecting to suffer when I saw the forecast temperatures were 100+, but the dry heat was - I hesitate to say comfortable - but very different from a 90 degree day on the East Coast with high humidity. An extended period of extreme heat + humidity can be brutal on the body, particularly those already vulnerable or without adequate air conditioning.

[nickjj]

Yeah humidity is no joke.

I'm in NY and when it's ~90f degrees out with high humidity, it's an unescapable heat unless you have an A/C.

I'm in ok shape I guess. I walk 3-5 miles a day in all types of weather ranging from about 10f to 100f degrees but when high temps hit with high humidity my skin immediately glazes over and I know to take it easy. My arms will be dripping wet in less than a minute just standing outside doing nothing with a ~60 BPM heart rate.

[Kye]

The reaction of someone who moved from a desert to Georgia is always interesting. Everyone has a unique way of processing the huge puddles of water under their car. Sometimes it's "oh yeah, humidity." Sometimes it's panic.

[erobbins]

It's deceptively comfortable :) You can very quickly find yourself dehydrated and in a bad state.