Climate is the statistics of weather, usually over a 30-year interval. It is measured by assessing the patterns of variation in temperature, humidity, atmospheric pressure, wind, precipitation, atmospheric particle count and other meteorological variables in a given region over long periods of time.
Once you have the saturation vapor pressure and the actual vapor pressure, relative humidity can be computed by dividing the actual vapor pressure by the saturation vapor pressure and then multiplying by 100 to convert the quantity to a percent. (7) Relative Humidity(RH) in percent =(E/Es)*100.
The easiest way to measure humidity is to buy a Hygrometer. Hygrometers measure humidity from 0% (dry) to 100% (when any more moisture comes out as precipitation or fog.). 1  Relative Humidity (RH) can change throughout the day. 2  Colder air holds less moisture, so the RH level will normally be higher at night.