humidity index

humidity index

[hyü′mid·əd·ē ‚in‚deks]
(climatology)
An index of the degree of water surplus over water need at any given station; it is calculated as humidity index = 100 s/n, where s (the water surplus) is the sum of the monthly differences between precipitation and potential evapotranspiration for those months when the normal precipitation exceeds the latter, and where n (the water need) is the sum of monthly potential evapotranspiration for those months of surplus.
References in periodicals archive ?
Least squares means of 1st parity pregnancy rate across temperature humidity index (THI) subclasses.
A number of temperature humidity index (THI) models are used to measure the degree of heat stress affecting fertility traits of cattle by using temperature and RH.
To test her observation, she checked the New York heat and humidity index for every day from January 1993 to February 1994 and compared it to the number of women who entered preterm labor.
Climate temperature, relative humidity, and the temperature humidity index
Maximum CT and minimum CT were selected, and the RH at the corresponding CT was selected to calculate maximum and minimum temperature humidity index (THI), respectively.
Dry bulb temperature and relative humidity were measured using a hygrometer at 08:00, 14:00, and 20:00 hrs, and the average daily temperature and humidity index (THI) were calculated using the following formula: THI = db ([degrees]C)-(0.
Cattle utilize evaporative cooling in the form of both sweating and panting in an effort to rid themselves of excess body heat when environmental temperatures begin to temperature and humidity index (THI) of 90 (Koatdoke, 2008).
With summer in full swing in the northern hemisphere, heat stress generally begins to affect a cow's performance when the Temperature Humidity Index (THI) reaches 68, and can significantly reduce their appetite, fertility and milk production levels.
This statistical interpolation used to be called the "temperature humidity index," but its simpler moniker has raised its stature to match its wintery cousin: the wind chill factor.
Ta = dry bulb temperature ([degrees]C), HR = relative air humidity (%), WS = wind speed (m/s), THI = temperature and humidity index, BGHI = Black globe-humidity index, TCI = Thermal Comfort Index, precipitation (mm).