The wet bulb temperature of Phoenix still gets very high. Last July, there was an average wet bulb temperature of 73 degrees Fahrenheit. 95 degrees will kill a healthy human, it takes much less to kill a vulnerable person or someone performing manual labor. Climate change is only going to raise that number.

I understand how wet bulb temperature works just fine. You didn't need to write a snarky response to engage in this discussion.

Now include climate change raising the temperature and changing the length and severity of monsoon season, continued development raising the heat island effect.

It doesn't matter what the average wet bulb temperature over the entire coty over a long period of time. It matters what the peak wet bulb temperature is for significant number of vulnerable people. The wet bulb temperature only has to get very high once to kill a large swath of people.

I understand just fine the wet bulb temperature has been within safe levels for the vast majority of people so far. My concern is about the future.