Meteorological indices

measurement of strength of sunburn-producing ultraviolet (UV) radiation

lowering of body temperature due to the passing-flow of lower-temperature air

measure of heating or cooling used in agriculture

thumb|upright=2|Plot of humidex depending on temperature and relative humidity The humidex (short for humidity index) is an index number used by Canadian meteorologists to describe how hot the weather feels to the average person, by combining the effect of heat and humidity. The term humidex was coined in 1965. The humidex is a nominally dimensionless quantity (though generally recognized by the public as equivalent to the degree Celsius) based on the dew point.

temperature index that accounts for the effects of humidity

heuristic tool in phenology

measurement of dryness

apparent temperature used to estimate the effect of temperature, humidity, wind speed, etc.; weighted average of wet-bulb temperature (weight 7), globe thermometer temperature (weight 2), and dry-bulb temperature (weight 1)

cold weather requirement in agriculture

Estimate of the soil moisture deficit

estimation of the risk of wildfire

estimation of the risk of wildfire