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    Heat Index Chart

    How to read the chart: Find the temperature on the left hand side, then move to the right until you find the column for the approximate relative humidity. That number will be the temperature that it will "feel" like. For example, a temperature of 95°F and relative humidity of 50% will "feel" like 107°. Add up to 15° if in the direct sun.

    Heat Index Chart
    Temperature (°F) vs. Relative Humidity
      10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80%
    115 111 115 120 127 135 143 151
    110 105 108 112 117 123 130 137 143 151
    105 100 102 105 109 113 118 123 129 135 142 149
    100 95 97 99 101 104 107 110 115 120 126 132 136 144
    95 90 91 93 94 96 98 101 104 107 110 114 119 124 130 136
    90 85 86 87 88 90 91 93 95 96 98 100 102 106 109 113
    85 80 81 82 83 84 85 86 87 88 89 90 91 93 95 97
    80 75 76 77 77 78 79 79 80 81 81 82 83 85 86 86
    75 70 71 72 72 73 73 74 74 75 75 76 76 77 77 78
    Heat Index/Heat Disorders
    Heat Index Possible heat disorders for people in higher risk groups
    130 or higher Heatstroke/sunstroke highly likely with continued exposure.
    105-130 Sunstroke, heat cramps or heat exhaustion likely, and heat stroke possible with prolonged exposure and/or physical activity.
    90-105 Sunstroke, heat cramps and heat exhaustion possible with prolonged exposure and/or physical activity.
    80-90 Fatigue possible with prolonged exposure and/or physical activity.
    Source: National Weather Service

     

    Related Links
    The Assessment of Sultriness. Part I: A Temperature-Humidity Index Based on Human Physiology and Clothing Science – R.G. Steadman
    The Assessment of Sultriness. Part II: Effects of Wind, Extra Radiation, and Barometric Pressure on Apparent Temperature – R.G. Steadman
    Heat Index "Equation” (or, More Than You Ever Wanted to Know About Heat Index) – Lans P. Rothfusz, NWS Technical Attachment SR 90-23 (PDF)
    Heat Index Calculator – National Weather Service
    Thermal Comfort Observations – Australia Bureau of Meteorology

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    Reference
    Catalog: Temperature and Relative Humidity
    Catalog: Main Table of Contents
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