Wilderness Medical Society snowmass 2005 Page 366
Apparent Temperature
Heat-stress risk with physical activity and/or prolonged
exposure.
90º-104º (32-40)
Heat cramps or Heat Exhaustion possible
105º-130º (31-54)
Heat cramps or Heat Exhaustion likely.
Heat Stroke possible.
130º and up (54 and up)
Heat Stroke very likely.
Caution: This chart provides guidelines for assessing the potential severity of heat stress. Individual
reactions to heat will vary. Heat illnesses can occur at lower temperature than indicated on this chart.
Exposure to full sunshine can increase values up to 15º F.
