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.
Relative humidity is the amount of moisture in the air compared to what the air can hold at that temperature. When the air can't hold all the moisture, then it condenses as dew. It is possible to produce what appears to be a good fit of the saturated vapor density of water all the way up to the boiling point.