> 90/90 would translate to a 87F dew point -- which is not a record, but it's pretty close, and there's a good chance it would be lethal to unprotected humans

> 90/90 would translate to a 87F dew point -- which is not a record, but it's pretty close, and there's a good chance it would be lethal to unprotected humans That would come as a great surprise to the millions of people who live in places like Houston, Texas or Miami, Florida, where 90/90 is common. (And that's only places in the US, since those are what I'm familiar with from doing HVAC testing years ago. Around the world there are many places that are even worse.) > normal in a place like Phoenix Arizona might be 110F but 20% RH. Yes, but Phoenix is a desert climate, not a hot, humid climate. There are many places that have hot, humid climates.