MTN News

MTN News- In Montana we have dry air and often strong winds that make it a bit harder for us to see that vapor cloud when we breathe.

Most of us know why our breath fogs up when we step outside on a cold night, but many of us do not know how cold it actually has to be for this phenomenon to happen.  The truth is, there is no perfect temperature that transforms your breath into a cloud.   In fact, the transformation is dependent on quite a few different variables: outside air temperature, humidity, and wind speeds.

It is important to know that cold air physically cannot hold as much water or moisture than warm air, because it cannot hold as much moisture, a simple breath of hot humid air from our bodies can provide enough moisture for condensation to occur and create fog cloud.

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Most of the time when we exhale on a warm night, the moisture is immediately evaporated and therefore we do not see a cloud.  The quicker the wind speeds the less likely you will see your breath fog up in front of you as it quickly mixes with the surrounding air.

On the flip side, the more humid it is the more likely you will see your breath fog up and that is because there is already so much moisture present in the air.


Reported by: Mikenzie Frost