temperature-humidity index
[tem-per-uh-cher-hyoo-mid-i-tee or, often, -yoo-, -pruh-, -per-cher-, -choor]
tem·per·a·ture-hu·mid·i·ty in·dex
[tem-per-uh-cher-hyoo-mid-i-tee or, often, -yoo-, -pruh-, -per-cher-, -choor] Based on the Random House Dictionary, © Random House, Inc. 2012.
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| a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S. |
| (used as a nonsense word by children to express approval or to represent the longest word in English.) |
| temperature-humidity index | |
| —n | |
| an index of the effect on human comfort of temperature and humidity levels, 65 being the highest comfortable level | |
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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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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