Abstract
The thermal discomfort is very important for meteorosensitive people. There exists a lot of indices for describing thermal comfort/discomfort or thermal load of human body.
A new Universal Thermal Climate Index (UTCI) is among preferred indices for use in CHMI's biometeorological forecast, but isn't the only possible. This paper brings a demonstration of indices' basic theoretical properties and a quick comparison of an UTCI to some other selected indices for some selected extreme weather situations.