Can rainbows predict the weather?

The size of water droplets in the air determines the brightness and width of the rainbow. When the water drops in the air are large, the rainbow is bright and narrow; On the contrary, if the water drops are small, the rainbow will be light and wide. We can't see the rainbow when facing the sun, but only when we are facing the sun, so the rainbow in the morning appears in the west and the rainbow in the evening always appears in the east. But we can't see it. We can only see it by looking down from the sky by plane. The appearance of rainbow is related to the weather change at that time. Generally, we can infer that it will be sunny or rainy at that time from the position where rainbow appears in the sky. When there is a rainbow in the east, it is not easy to rain locally, but when there is a rainbow in the west, it is very likely to rain locally.

The visibility of the rainbow depends on the size of water droplets in the air. The larger the water droplets are, the brighter the rainbow will be, while the smaller the water droplets are, the less obvious the rainbow will be. Generally, the temperature in winter is low, so it is not easy to have small water droplets in the air and there are few opportunities for showers, so there is generally no rainbow in winter.