Dew point calculator
This dew point calculator helps you determine the dew point temperature. You can calculate the dew point temperature by inputting the air temperature and relative humidity.
Additionally, this calculator accommodates the dew point temperature as an input, allowing you to calculate either the air temperature or relative humidity.
Simply provide two out of the three variables to calculate the third. Please note that if you input all three values, the calculator will use the air temperature and relative humidity to compute the dew point temperature.
| Air temperature (°F): | |
| Air temperature (°C): | |
| Air temperature (K): |
| Relative humidity: |
| Dew point (°F): | |
| Dew point (°C): | |
| Dew point (K): |
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What is the dew point temperature?
The dew point temperature is the temperature at which air becomes saturated with moisture and water vapor begins to condense into liquid water, forming dew. In other words, it’s the temperature at which the air can no longer hold all the moisture it contains, and some of that moisture begins to change from a gas (water vapor) into a liquid (water droplets).
When the air temperature falls to the dew point temperature, you’ll often see dew forming on surfaces like grass, leaves, and car windshields in the morning. If the temperature falls below the dew point, you can also get frost forming on surfaces.
Dew point temperature is a useful metric in weather forecasting because it provides information about the moisture content in the air. When the air temperature is close to the dew point, it can indicate that the air is nearly saturated with moisture, which might lead to the possibility of fog, dew, or other weather conditions. It’s also used in various fields like agriculture, aviation, and meteorology to assess humidity and potential weather-related issues.
What is humidity?
Humidity refers to the amount of water vapor or moisture present in the air. It is an essential component of the Earth’s atmosphere and plays a crucial role in weather and climate. Humidity is typically expressed as a percentage, known as relative humidity, and it indicates how close the air is to being saturated with moisture.
When the relative humidity is 100%, the air is holding the maximum amount of water vapor it can at a given temperature, and this often leads to the formation of clouds and precipitation. Lower relative humidity values indicate drier air, while higher values suggest that the air is closer to being fully saturated with moisture. Humidity levels can affect our comfort, as high humidity can make the air feel warmer and more uncomfortable, while low humidity can make the air feel dry and cooler.
There is also absolute humidity.
Absolute humidity refers to the actual amount of water vapor or moisture present in a unit volume of air, typically expressed in grams of water vapor per cubic meter (g/m³) or grains of water vapor per cubic foot. It is a measure of the mass of water vapor in a given volume of air and is not dependent on the air’s temperature or pressure.
Absolute humidity is different from relative humidity, which is a ratio of the current absolute humidity to the maximum amount of water vapor that the air can hold at a particular temperature and pressure. Absolute humidity provides a more precise and direct measurement of the moisture content in the air, while relative humidity is a percentage that describes how close the air is to being saturated with moisture.
Scientists and meteorologists use absolute humidity in various applications, such as studying weather patterns, indoor air quality assessment, and industrial processes where precise control of moisture content is necessary.
Relative humidity vs. dew point temperature
Relative humidity and dew point temperature are both meteorological parameters related to moisture in the air, but they serve different purposes. Relative humidity is expressed as a percentage and indicates how close the air is to being saturated with moisture at a given temperature. It measures the ratio of the actual amount of water vapor in the air to the maximum amount the air can hold at that temperature.
Dew point temperature, on the other hand, represents the temperature at which the air becomes saturated with moisture, leading to condensation or dew formation. It signifies the point at which the air can no longer hold all the water vapor, and any excess vapor begins to condense into liquid water. Relative humidity is often used in weather forecasts and for assessing comfort levels, while the dew point temperature is crucial in various applications such as aviation, agriculture, and HVAC to predict condensation and prevent moisture-related issues.