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NOAA Heat Index Measures Risk To Athletes

National Oceanic and Atmospheric Administration
("NOAA") Heat Index

 

Temperature in Degrees F.

Relative Humidity 70 75 80 85 90 95 100 105 110 115 120

0%

64 69 73 78 83 87

91

95

99

103

107

10%

65 70 75 80 85

90

95

100

105

111

116

20%

66 72 77 82 87

93

99

105

112

120

130

30%

67 73 78 84

90

96

104

113

123

135

148

40%

68 74 79 86

93

101

110

123

137

151

 

50%

69 75 81 88

96

107

120

135

150

 

 

60%

70 76 82

90

100

114

132

149

 

 

 

70%

70 77 85

93

106

124

144

 

 

 

 

80%

71 78 86

97

113

136

 

 

 

 

 

90%

71 79 88

102

122

 

 

 

 

 

 

100%

72 80

91

108

 

 

 

 

 

 

 

 

How To Use Heat Index:

  1. Across top locate Temperature
  2. Down left side locate Relative Humidity
  3. Follow across and down to find Apparent Temperature *
  4. Determine Heat Stress Risk on chart below
Apparent Temperature Heat Stress Risk with Physical Activity and/or Prolonged Exposure

90° to 105°

Heat cramps or heat exhaustion possible

105° to 130°

Heat cramps or heat exhaustion likely, Heatstroke possible

130° and up

Heatstroke highly likely

 

* Combined index of heat and humidity. In other words, what it feels like to the body

This heat index chart is designed to provide general guidelines for assessing the potential severity of heat stress. Individual reactions to heat will vary. In addition, studies indicate that the susceptibility to heat disorders tends to increase with age. Exposure to full sunshine can increase Heat Index values by up to 15° F.

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