humidity coefficient

humidity coefficient

[hyü′mid·əd·ē ‚kō·i′fish·ənt] (meteorology) A measure of the precipitation effectiveness of a region; it recognizes the exponential relationship of temperature versus plant growth and is expressed as humidity coefficient = P /(1.07) t , where P is the precipitation in centimeters, and t is the mean temperature in degrees Celsius for the period in question; the denominator approximately doubles with each 10°C rise in temperature.