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ACP Humid Heat Stroke Index Peak Wet-Bulb Temperature Characteristics of the hottest part of the day
I 74°F to 80°F Uncomfortable. Typical of much of summer in the Southeast.
II 80°F to 86°F Dangerous. Typical of the most humid parts of Texas and Louisiana in the hottest summer month, and the most humid summer days in Washington and Chicago.
III 86°F to 96°F Extremely dangerous. Comparable to the Midwest during peak days of the 1995 heat wave.
IV > 92°F Extraordinarily dangerous. Exceeds all US historical records. Heat stroke likely for fit individuals undertaking less than one hour of moderate activity in the shade.
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Recent Wet Bulb Temperatures

Calculations for wet bulb temperatures from NOAA.