Walking outside into a heat stroke

[NutmegYankee]

61. If it was 90% humidity and 90°F, the Heat index would be 122°F.

The humidity % drops steeply as the day heats up. The 100% humidity point is the dew point, which rarely goes into the 80s in the USA. Dewpoints in the 90s are potentially fatal with a dewpoint of 95 or higher being unsurvivable without escape. No place on earth is that hot and humid - yet.

Dew point Human perception[1] Relative humidity at 32 °C (90 °F)
Over 80 °F Severely high. Even deadly for asthma related illnesses 65% and higher
75–80 °F Extremely uncomfortable, fairly oppressive 62%
70–74 °F Very humid, quite uncomfortable 52–60%
65–69 °F Somewhat uncomfortable for most people at upper edge 44–52%
60–64 °F OK for most, but all perceive the humidity at upper edge 37–46%
55–59 °F Comfortable 38–41%
50–54 °F Very comfortable 31–37%
Under 50 °F A bit dry for some 30%