The main reason is the increasing length of darkness. This increases the time of radiational cooling thus causing the temperature to fall below the dew point. That is how fog is created. Warm air can hold more water vapor than cool air, so as the air cools overnight, the water vapor condenses into small droplets that are suspended in the air. This is what causes fog. You've probably noticed that during fall there is more dew on your vehicle than any other season. The temperature of the surface of your vehicle is normally cooler than the air, so condensation occurs on most mornings. Note that during the winter and spring, fog can be more common along coastal areas because the cool ocean waters cool the air below the dew point. This fog can blow inland on some days.
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