temperature–humidity index
- temperature–humidity index
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▪ meteorological measurement
combination of temperature and humidity that is a measure of the degree of discomfort experienced by an individual in warm weather; it was originally called the discomfort index. The index is essentially an effective temperature based on air temperature and humidity; it equals 15 plus 0.4 times the sum of simultaneous readings of the dry- and wet-bulb temperatures. Thus, if the dry-bulb temperature is 90° F (32° C) and the wet-bulb temperature is 50° F (10° C), the discomfort index is 15 + 0.4 (140), or 71. Most people are quite comfortable when the index is below 70 and very uncomfortable when the index is above 80 to 85. In the U.S. the highest average daily values of the THI, exceeding 80, consistently occur in the southern California deserts and southwestern Arizona in July and August.
Compare windchill.
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Universalium.
2010.
Look at other dictionaries:
temperature-humidity index — /tem peuhr euh cheuhr hyooh mid i tee/ or, often, / yooh , preuh , peuhr cheuhr , choor / a number representing an estimate of the effect of temperature and moisture on humans, computed by multiplying the sum of dry bulb and wet bulb temperature… … Useful english dictionary
Temperature Humidity Index — An index that combines sensible temperature and air humidity to arrive at a number that closely responds to the effective temperature; used to relate temperature and humidity to levels of comfort … Energy terms
temperature-humidity index — A number representing an estimate of the effect of temperature and moisture on humans, computed by multiplying the sum of dry bulb and wet bulb temperature readings by 0.4 and adding 15, with 65 assumed as the highest comfortable index. Actual… … Dictionary of automotive terms
temperature-humidity index — /tem peuhr euh cheuhr hyooh mid i tee/ or, often, / yooh , preuh , peuhr cheuhr , choor / a number representing an estimate of the effect of temperature and moisture on humans, computed by multiplying the sum of dry bulb and wet bulb temperature… … Universalium
temperature — n. 1 the degree or intensity of heat of a body in relation to others, esp. as shown by a thermometer or perceived by touch etc. 2 Med. the degree of internal heat of the body. 3 colloq. a body temperature above the normal (have a temperature). 4… … Useful english dictionary
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index — 1. [NA] SYN: i. finger. 2. A guide, standard, indicator, symbol, or number denoting the relation in respect to size, capacity, or function, of one part or thing to another. SEE ALSO: quotient, r … Medical dictionary
Heat index — The heat index (HI) is an index that combines air temperature and relative humidity in an attempt to determine the human perceived equivalent temperature how hot it feels, termed the felt air temperature. The human body normally cools itself by… … Wikipedia
heat index — a number representing the effect of temperature and humidity on humans by combining the two variables into an apparent temperature, introduced as a replacement for the temperature humidity index: a temperature of 90° and relative humidity of 65… … Universalium
heat index — a number representing the effect of temperature and humidity on humans by combining the two variables into an apparent temperature, introduced as a replacement for the temperature humidity index: a temperature of 90° and relative humidity of 65… … Useful english dictionary
