Abstract
The mean relative humidity in the troposphere is expressed as a linear function of the total cloudiness, and the specific humidity as a function of temperature and cloudiness. A formula for the total precipitable water as a function of the cloudiness, the surface temperature, and the 500-mb. temperature is given. Computations of the total precipitable water over the Northern Hemisphere with the derived formula, using monthly averages, show good agreement with the estimates made by Starr, Peixoto, and Crisi.

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