Why is it not warm? What if it does this every year?

Due to the recent frequent southward cold air, there has been a large area of cooling, rainfall and snowfall in the country. However, after the 20th, the national temperature will obviously rise, and it will exceed the annual temperature. The temperature rise and drop these days is only temporary, and the weather is still slowly rising. . . The reason is caused by unreasonable exploitation and utilization of human beings. . .