It was about that here too. I biked to work. The thing is, it was 103 at 8am, when I biked to work. I definitely got sweaty on the way home, but that's pretty much fine.

Cool! Does your grandma bike to work too? Heat stroke is real, and it is deadly.

No. She doesn't get around much these days. Thanks for your concern.

I wasn't concerned! I was asking because you seem to be sure that humans won't die in the heat while riding bikes.

Not universally. But in some circumstances.

I don’t know where you live, but 103F in even moderate humidity can kill or injure even fit athletes surprisingly quickly.

Always check the wet bulb temperature before going out in conditions like that.

Greater Sacramento region. I don't know how to check the wet bulb temperature at the moment. Humidity is relatively low here. It would be different in Florida or something.

It isn’t just inferior here, it is legitimately dangerous to human life. We regularly get black flag weather here in the southern U.S., where the wet bulb temp is so high that the human body can no longer shed heat via perspiration.

I love being outdoors, but I am very careful in conditions like we’ve had recently with 100+ temperatures and high humidity. Even fit persons can get heat stroke very easily. The UV index has also been incredibly high lately, I have to soak sunscreen on or I burn and my skin type is normally easily tans rarely burns.

> where the wet bulb temp is so high that the human body can no longer shed heat via perspiration.

What the parent poster just described is a very serious and real affliction that is capable of extinguishing human life. Believe it or not.