Determined by weighing a special type of wooden stick that has been exposed in the woods, its weight being proportional to its contained water.

Anemometer whicb measures wind speed by measuring the degree of cooling of a metal wire heated by an electric current. A type of cooling power anemometer.

A hygrometer in which the sensitive element is a strand or strands of human hair, the length of which is a function of the relative humidity of the air.

Same as fogbow.

Water vapor content of the air. See absolute humidity, dew point, mixing ratio, relative humidity, specific humidity.

A rain gauge which indicates but does not record the amount of precipitation captured.