Why is there no sunset and sunrise on cloudy days?

Sometimes you can see the sunrise on cloudy days.

In the weather forecast, cloudy means that there are many clouds in the sky and there is not enough sunshine, but the sun can still be seen through the cracks in the clouds, so there is a chance to see the sunrise and sunset. But when the clouds are thick and dense, most of them will be blocked at sunrise and sunset, and the sun or panorama will not be seen.

The most basic conditions for watching the sunrise

1, less clouds: large temperature difference has the best effect, which can liquefy the moisture in the air to the maximum extent and is not easy to generate clouds.

2, high visibility: the air humidity is low, and the temperature difference is preferably large, so that the air humidity is not easy to approach saturation to produce foggy weather.

3. The contrast of the horizon background is high: the sea should be calm and the transparency of the sky should be high, so it is easier to see the complete sunrise at sea in winter than in summer.