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The ‘Heat Index’ is a measure of how hot weather "feels" to the body. This table uses relative humidity and air temperature to produce the "apparent temperature" or the temperature the body "feels".
- Heat Index - National Oceanic and Atmospheric Administration
How to read the chart: Look for the temperature across the...
- Heat Index - National Oceanic and Atmospheric Administration
21 Ιουλ 2016 · Calculate the heat index from the temperature and humidity (either relative humidity or dew point), or use a simple heat-index conversion chart.
National Weather Service Heat Index Chart Temperature (EF)Relative Humidity (%) 80 82 84 86 88 90 92 94 96 98 100 102 104 106 108 110 40 80 81 83 85 88 91 94 97 101 105 109 114 119 124 130 136 45 80 82 84 87 89 93 96 100 104 109 114 119 124 130 137 50 81 83 85 88 91 95 99 103 108 113 118 124 131 137 55 81 84 86 89 93 97 101 106 112 117 124 130 137 60 82 84 88 91 95 100 105 110 116 123 129 137
heat index °f (°c) The heat index is an accurate measure of how hot it really feels when the affects of humidity are added to high temperature. RELATIVE HUMIDITY (%)
Heat illnesses can occur at lower temperature than indicated on this chart. Exposure to full sunshine can increase values up to 15º F.
The Heat Index is a measure of how hot it really feels when relative humidity is factored in with the actual air temperature. To find the Heat Index temperature, look at the Heat Index Chart above or check our Heat Index Calculator .
20 Σεπ 2023 · How to read the chart: Look for the temperature across the top, then find the relative humidity on the left. The point where they intersect on the chart tells you the Heat Index, color-coded by likelihood of a heat disorder. For example, look at an air temperature of 100°F (38°C) and Relative Humidity of 40%.
