Why is foggy in the morning necessarily good weather?

Most of the fog we usually see is on a clear and cloudless night. The ground cools down strongly, and the water vapor in the air near the ground condenses into small water droplets suspended in the air to produce fog, that is, radiation fog. Ten fogs and nine sunny days refer to this kind of fog. The conditions needed to produce this fog are sufficient water vapor, strong radiation and breeze in the lower air. Areas that meet these three conditions are generally under the control of cold high pressure or weak high pressure after rain, and the weather under the control of these two weather systems is mostly sunny. This kind of fog also mostly appears at night or in the morning. After the sun rises, due to the intense warming of the ground and the destruction of the near-surface inversion layer, the fog dissipates and the sky remains clear. Foggy and sunny, that's what it means. But when there is advection fog, steam fog, etc. It's not always sunny.