Why does cloudy weather affect the mood?

Many people will feel comfortable and happy when they look at sunny days, otherwise they will feel depressed, agitated and sad! Presumably this is related to everyone's ideological character and way of thinking! When the weather is good, the sky is mostly bright, whereas it is dark, and people's feelings about colors are similar! From a macro point of view, people still yearn for light and oppose darkness! From a microscopic point of view, fine weather can do more things, and vice versa!