Excuse me, when rainy weather comes, can it be said that cold air is coming? Didn't the cold air just come from the north? Thank you for your answers.

No, but the summer monsoon is moving north.

Meiyu front: The stationary front in Meiyu period is called Meiyu front. It is the convergence line of summer monsoon airflow and polar air mass or metamorphic polar continental air mass, and it has intertropical convergence zone property. Features: the horizontal temperature gradient on both sides of the front is small and the humidity gradient is large.