|ACP Humid Heat Stroke Index
||Peak Wet-Bulb Temperature
||Characteristics of the hottest part of the day
||74°F to 80°F
||Uncomfortable. Typical of much of summer in the Southeast.
||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.
||86°F to 96°F
||Extremely dangerous. Comparable to the Midwest during peak days of the 1995 heat wave.
||Extraordinarily dangerous. Exceeds all US historical records. Heat stroke likely for fit individuals undertaking less than one hour of moderate activity in the shade.
Web Bulb Temperature:
Recent Wet Bulb Temperatures
Calculations for wet bulb temperatures from NOAA.