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.
If the interior of the building is kept at 70Â°F and 35% relative humidity, we can use the psychrometric chart to determine the dew point. On the bottom of the chart, find 70Â°F. Follow the vertical line up from 70Â°F at the base until you intersect a curved line corresponding to 35% relative humidity.