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Difference between Dew and Fog

Difference between Dew and Fog

We often use the words dew and fog interchangeably, but they are actually quite different. Have you ever stopped to think about what the difference between them is? They both appear in similar weather conditions and they can help create picturesque landscapes – but there are several key differences that set them apart. In this blog post, we’ll walk through their distinct characteristics and see how each of these natural phenomena contributes to nature’s beauty. Let’s start by looking at exactly what dew and fog are so that we can truly understand their unique properties!

What is Dew?

  • Dew, no matter how small or unnoticeable, is a form of precipitation in the atmosphere. It is formed when small droplets of water form on plants and naked soil surfaces due to condensation.
  • Dew usually falls at night or in the early morning as temperatures cool and the air can no longer hold onto as much moisture. Dew forms through a process called dew point, which is when water vapor turns into liquid droplets at different air temperatures, and typically require very humid conditions.
  • Dew may be gentle yet vital for sustaining life on Earth, although it often goes unrecognized. Though often overlooked, Dew is an essential part of nature’s balance and we must appreciate its unique properties to fully understand our own environment.

What is Fog?

  • Fog is an atmospheric phenomenon characterized by the presence of cloud droplets suspended in the air at or near the Earth’s surface. It is notorious for obscuring visibility, giving visibility of up to only an estimated 1km and sometimes just a few meters.
  • Fog forms when a large volume of cold air meets an equally dense warm air, the moist air rises and ascends resulting in a reduction in temperature which then causes the water vapor contained within it to condense and develop.
  • Fog can be observed all over the world with forms ranging from patchy fog to freezing fog, varying from light and fluffy as well as thick and below freezing due to altitude differences. Fog grounds airplanes, covers cities, and disrupts transportation networks but also offers an interesting sight for those willing enough to brave weather forecasts.

Difference between Dew and Fog

Dew and fog are both forms of atmospheric moisture that can appear early in the morning yet there are distinct differences between them.

  • Dew is often seen forming on grass, leaves, and other objects with surfaces that have cooled during the night whereas Fog consists of tiny water droplets suspended in the air at a particular location which creates a blurring effect.
  • Dew will also vary depending on the dew point temperature of air but overall it refers to condensation that appears on exterior objects when temperatures drop overnight such as after thunderstorms.
  • In contrast, fog produces an overall misty environment when looking out into a distance due to the suspension of tiny water particles in the air.

Both Dew and Fog can be beautiful occurrences to witness first thing in the morning yet they differ in their formation processes.


Dew and Fog are both forms of water vapor in the air. However, they differ in how they form and their appearance. Dew forms when the air cools down and condenses on objects such as leaves or grass. Fog forms when warm air meets cold air, which can happen either near the ground or high up in the sky. Both dew and fog can create a spectacular sight, but now you know the difference between these two phenomena!

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