Dew Point Example: in the chart below, if the room temperature (Tdb) is 43 degC and the relative humidity (RH) is 20% (the curved line reading up from 43 degC) then the dew point is 15 degC (reading horizontally across to the left-most curved line and noting the dew point temperature scale set along that curve). A sample of a station model with dew point (46 degrees Fahrenheit) annotated. For another example, in the summertime, if the cooling system chills ducts, air diffusers, or nearby walls and ceilings below the indoor dew point, you can expect condensation on those cool surfaces. As long as the actual temperature drops to below the dew point temperature with enough water vapor in … For example, you can have a temperature and dew point both at 30°F, and the air will have a 100% relative humidity, but it won’t feel humid outside. For example, it may only be 90 F, but it … The number located in the lower-left corner of the model is the station dew point in degrees Fahrenheit (or Celsius depending on the country of origin). Finding the dew point on a station model is also pretty easy. For example, if a facility’s indoor dew point is above 60 o F, it is possible that moisture will begin to condense on cool surfaces like ductwork, chilled water supply lines, windows, or refrigeration systems. Please Note: The scenario above is just a hypothetical example. Unlike relative humidity, dew point temperature is not dependent on temperature. Readings from measuring instruments: temperature = 20.0 °C : Relative Humidity = 50%: This information has been sourced, reviewed and adapted from materials provided by Innovative Sensor Technology. Example: Read the air temperature in the left hand column and the humidity at the top of the chart. When you have a high temperature and a high humidity level or dew point, you have a higher heat index as well. Example Calculation of Dew Point. This collection of moisture can cause damage to the building, as well as to merchandise. Dew Point Temperature at which moisture will condense on surface. Example If the air temperature is 70 degrees F and relative humidity is 65%, the dew point is 57º F. No coating should be applied unless surface temperature is 62º F minimum. How to use dew point in a sentence. Credit: David Babb. Relative humidity DO NOT need to reach 100% in order for condensation and rain to take place. For more information on this source, please visit Innovative Sensor Technology. If the temperature of the storage unit is 75°F (24° C) and the relative humidity is 35%, the intersection of the two shows the dew point of the area to be 45°F (7°C). Dew point definition is - the temperature at which a vapor (such as water) begins or would begin to condense. 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