ताप सूचकांक कैलकुलेटर
The detailed guide below is currently available in English.
Why humidity makes heat dangerous
Your body cools itself by sweating, and sweat only works if it evaporates. When the air is already loaded with moisture, evaporation slows and the same thermometer reading feels far hotter — 90°F in dry air is manageable, while 90°F at 70% humidity strains the body like 105°F heat. The heat index combines temperature and relative humidity into that apparent temperature.
Reading the risk bands
A heat index of 80–90°F brings fatigue with prolonged exposure; 90–103°F is extreme caution territory, where heat cramps and heatstroke become possible; 103–124°F is dangerous, and sunstroke is likely with continued activity. At 125°F and above the conditions are extreme. During the hottest stretch of the day, shift exercise and outdoor work to the morning and drink before you feel thirsty.
अक्सर पूछे जाने वाले प्रश्न
What is the difference between heat index and the "feels like" temperature in a weather app?
They are closely related. Most apps show the heat index in warm weather and switch to wind chill in cold weather; some blend in sunshine and wind effects as well.
Why is the heat index not defined below 80°F?
The regression was fitted to hot, humid conditions. In cooler air the body sheds heat easily and humidity has little effect on perceived temperature, so the index is simply reported as the air temperature.
Does sunshine change the heat index?
Yes. The published values assume shade with a light breeze; full sun can push the apparent temperature up by as much as 15°F.