Just as the OP said, these temperatures are deadly.

From https://www.houstontx.gov/health/Epidemiology/e-heat-illness....:

> In the summer of 2000, 26 deaths involving Houston residents were reported. In 2001, 13 deaths were due to heat.

From https://environmenttexas.org/news/txe/global-warming-increas...:

> Thursday, September 6, 2007, HOUSTON – The death toll from extreme heat in Houston each summer will increase from about 24 to nearly 32, resulting in 192 additional heat-related deaths by mid-century

> Just as the OP said, these temperatures are deadly.

> > Thursday, September 6, 2007, HOUSTON – The death toll from extreme heat in Houston each summer will increase from about 24 to nearly 32

The actual number of heat deaths in Houston and Harris County in 2018 was 15; Houston itself sees 4–6 per year. Maybe air conditioning is more common a decade later than was originally predicted, or perhaps medical intervention arrives more quickly or is more effective.

Sources: https://nihhis.cpo.noaa.gov/Urban-Heat-Island-Mapping/Campai... and https://www.houstonpublicmedia.org/articles/news/in-depth/20...

I think the problem with the OP is they said it 'means death'. Can be deadly would be better phrasing, particularly to those who are susceptible.

The reason why I think this distinction is important is because there is some level of heat + humidity where it really does mean death to anyone in some short amount of time.