Created By : Naaz Fatima

Reviewed By : Phani Ponnapalli

Last Updated : May 08, 2023

Dew Point Calculator is a helpful tool that provides answers to any of your inquiries about the idea of dew point. In the blink of an eye, find Dew Point given inputs such as temperature and relative humidity.

Choose a Calculation
Temperature:
Relative Humidity:

What is Dew Point?

The temperature at which water vapour begins to condense into water is known as the dew point. For instance, if the relative humidity in your room is high, dew will collect on the glass surface. The reason for this is that the temperature outside the window has dropped below the dew point.

What is Relative Humidity?

The ratio of current absolute humidity to maximal absolute humidity for that temperature is known as relative humidity. To put it another way, the amount of moisture in the air in comparison to the maximum amount of air that the temperature can contain.

Relative Humidity = current absolute humidity / maximum absolute humidity at current temperature * 100 %

The ratio of water vapour pressure Pw to saturation water vapour pressure Pws is known as relative humidity. Relative humidity = 100% * Pw / Pws.

Absolute humidity must be understood before relative humidity can be understood. Absolute humidity refers to the amount of water in the air and is measured in grammes per cubic metre. Absolute humidity is calculated using the formula Absolute Humidity = m / V

• Where, m = mass of water vapour
• V = volume of air and water vapour mixture.

What is the best way to determine the dew point?

The link between dew point and relative humidity is described by a number of equations. We've developed a Magnus-Tetens Formula from all of them that gives you accurate results for temperatures ranging from -45°C to 60°C.

Ts = (bα(T,RH)) / (a - α(T,RH)) is the Dew Point Formula

• Where, Ts = Dew point
• T = Temperature
• RH = relative humidity of air
• a, b are coefficients, and for Sonntag90 constant set, a = 17.62 and b = 243.12°C
• α(T,RH) = ln(RH/100) + aT/(b+T)

Humidity vs. Dew Point

It's tough to tell the difference between Dew Point and Relative Humidity because they're so closely related. Now that we've covered the dew point and relative humidity calculations, let's take a closer look at the notion. The precise measurement of moisture in the air is known as the dew point. on the other hand, Relative Humidity is a quantity that is affected by both temperature and atmospheric pressure.

The closer the dew point is to the present air temperature, the higher the relative humidity. When the air is saturated to the maximum with water, the dew point is equal to the present temperature.

Dew Point Applications

There are a number of uses for dew point, which are described below.

• Meteorology is the science of expressing the amount of moisture in the air.
• Dew Point Temperature is used in the aviation industry to determine the likelihood of carburettor icing or fog formation.
• Dew Point Meters are used in electronics, optics, and the production of technical gases such as H2, N2, O2, Ar, and others.
• Dew point is used in agriculture to maintain ideal humidity in greenhouses and avoid water condensation on plants.
• It's used in medicine to keep track of the sterilising procedure.

What does it mean to have a Comfortable Dew Point?

The presence of a high dew point might cause pain. Because the air is already saturated with water, our bodies take longer to evaporate sweat in high temperatures.

Dew point Comfort levels
<50°F (<10°C) a bit dry for some
50 - 60°F
(10 - 16°C)
dry and comfortable
60 - 65°F
(16 - 18°C)
getting sticky
65 - 70°F
(18 - 21°C)
unpleasant, lots of moisture in the air
>70°F
(>21°C)
uncomfortable, oppressive, even dangerous above 75°F

FAQs on Dew Point Calculator

1. What is the dew point?

The greatest temperature at which water vapour may condense and create dew is known as the dew point.

2. What happens when the temperature exceeds the dew point?

The amount of moisture in the air increases as the dew point rises, causing discomfort.

3. What is dew point 70?

A dew point of 70 or higher will suffocate you and drastically raise the feel-like temperature. Comfort Level Scale Higher quantities of water vapour can be sustained in warmer air.

4. What does the dew point represent when it comes to rain?

If the dew point is 60 degrees and the air temperature is 60 degrees, it's most likely raining (or, in the case of Friday morning, creating fog and/or dew), because the atmosphere can't store any of that moisture as a gas, so it must condense as dew or precipitation.