What is the dew point?

Calculating and interpreting the dew point, how to use

Updated this week

Dew point is a critical factor in agriculture because it directly affects various aspects of crop growth, disease management, and overall farm management.


The dew point corresponds to the value of the temperature at which the air becomes saturated with water.

This threshold is dependent on pressure, humidity, and the surrounding temperature. If the temperature drops below the dew point, then the water condenses, forming dew.

Depending on the wind speed, this water vapor may form dew, fog, or low clouds.

Sencrop - dew point

Harvest and fight frost

This is a useful indicator when dealing with large crops at harvest time, for example.

In fact, water condensation makes harvesting more difficult. Knowing the dew point can therefore help farmers determine the optimum windows of intervention and manage their organization. It also helps them adapt in real time.

The dew point is also a telling indicator for other crops (viticulture, arboriculture, etc.). It is a useful way to keep an eye on the drop in temperature when the sun goes down. During periods of cold weather, the dew point allows users to anticipate the appearance of frost.

The foliage of vines, for example, cools down more quickly than the air, and condensation can be seen forming on it.

Often the air temperature is > 0°C, but the soil and the plants are already ‘white’ (in other words, it is a hoar frost and not a true air frost).

By effectively utilizing dew point data, farmers can make informed decisions that enhance crop health, improve yield, and ensure efficient resource use. This leads to more sustainable and profitable agricultural practices.

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