What Causes the ‘Fog’ in Winter?

When the air is cold, it can hold less moisture than warm air. If you breathe out on a chilly day, your warm breath meets the cold air and turns into tiny water droplets, that’s fog! It's like when you blow on a window in winter and see your breath as mist.

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Examples

Your breath turns into little clouds when it hits the cold outside.
The park looks like it's covered in a soft blanket of mist on chilly mornings.
Steam rises from your coffee cup as you sip it outside.

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Categories: Environment · weather,science,winter