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T.H.I.

1.
temperature-humidity index.

temperature-humidity index

[tem-per-uh-cher-hyoo-mid-i-tee or, often, -yoo-, -pruh-, -per-cher-, -choo r] /ˈtɛm pər ə tʃər hyuˈmɪd ɪ ti or, often, -yu-, -prə-, -pər tʃər-, -ˌtʃʊər/
noun
1.
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.
Abbreviation: T.H.I.
Compare heat index.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for t.h.i

temperature-humidity index

noun
1.
an index of the effect on human comfort of temperature and humidity levels, 65 being the highest comfortable level
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Encyclopedia Article for t.h.i

temperature-humidity index

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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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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