It's cold in Xiamen recently. On rainy days, some people say that it is "a spring rain and a warmth". Why?

In spring, due to the gradual strengthening of the sun in the northern hemisphere, the warm air in the Pacific Ocean extends to the northwest. When the warm air mass pushes northward and slides upward at the boundary of the cold air in the north, rain is produced. In the process of sliding upward, cold air is pushed to the north at the same time. In this way, warm air often occupies the ground originally occupied by cold air, so before the arrival of warm air, there will often be a spring rain in these places.

After the rain, controlled by warm air, the weather turns warmer, and it will rain again if the cold air rebounds south in the future. When the cold air front passed, it was controlled by cold air, and there was a cold weather for a day or two. But in a few days, this cold air absorbs a lot of solar heat. Due to the influence of ground warming, its temperature rises and it will gradually become warm air. So people always think that it is always warm after the rain in spring, as long as the weather is good. The feeling of "a spring rain and a warmth" is this truth.