Why do some places get fog much more often than others?
Quick Answer
Fog forms when air cools to its dew point, and some regions reach that point more easily because of moisture, temperature patterns, and terrain. Coastal upwelling, valleys, and calm nights are especially fog-friendly.
The Full Story
Fog is essentially a cloud at ground level, created when air becomes saturated and tiny water droplets form. Coastal regions often get fog when cold ocean currents cool moist air from above, a classic example being the fog along California’s coast. Valleys can trap cool air overnight, while calm conditions let temperatures fall to the dew point near the ground. The local combination of moisture supply, cooling, and topography makes fog much more frequent in some places than in others.
Key Facts
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"Why does one town wake up in fog while another stays clear?"
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