Phoenix, Arizona, saw its 100th straight day of 100F (37.7C) heat this week.
The hottest large city in the United States broke its previous record of 76 consecutive 100F days set in 1993. The relentless streak, which started on 27 May and hit its 100th day on Tuesday, is forecast to persist into next week. An excessive heat warning is in effect through Friday, with temperatures expected to reach 110F (43C) tomorrow.
This summer was the hottest one in Phoenix since 1896, when records first began. Latest county data shows that at least 177 people died from heat-related causes so far this year, with 436 under investigation. Last year, Maricopa county saw 645 confirmed heat-related fatalities, enduring 55 days in a row with above 110F temperatures.
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20% at 111°F is a degree or so close to imminent heat stroke (followed by death).
So yes hydrometry counts (90% at 90°F is bad too) but it won’t always save you.
I’m a proponents of using a scale including hyrgrometry and not just only using temperature, especially when hot it’s such a bullshit measure (temp only).
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https://en.m.wikipedia.org/wiki/Wet-bulb_temperature
WBT 35°C or a WBGT of around 31°C represents the threshold where conditions become life-threatening.