Why is the weather so strange?

The weather in spring is changeable. Because the warm air mass from the southern ocean began to strengthen northward, the cold air force occupying the mainland in winter did not weaken, and the cold air mass started a tug-of-war in the south, and the strength of the cold air mass often changed, so precipitation (frontal rain) was common. Due to the alternation of cold and warm air masses, the temperature in this season is also high and low. If you don't pay attention, you will catch a cold easily. So it's freezing in spring and autumn, and there's no hurry to take off your clothes in spring.