Why did the temperature suddenly rise here?

1, which is a precursor to the arrival of cold air. Because of the power of cold air, warm air is constantly pushed to the south, but when the warm air is pushed back, the wind direction is not the north wind. I don't know where you are, and it's not easy to be sure, because every place will have its own unique climate characteristics, but what is certain is that warmth is only an illusion, and cold air will come at lightning speed soon.

2. If you are in the north, it is likely that after the cold air passes through the border, the weather turns fine and the temperature rises, but the temperature difference between day and night is large.