Why does it often rain when Hengdian Studios go to May Day?

As the temperature rises, the atmospheric humidity increases, and affected by seasonal storms, coupled with the continuous evaporation and rising of water vapor, it is easy to form clouds and cause rainfall. At the same time, the May Day period is also the peak period of national tourism. A large number of tourists flood into various places, and human activities will also have a certain impact on the weather, which may affect the stability of the weather and lead to rainfall. From the end of April to the beginning of May, this period is in the transition period from spring to summer. The climate change is relatively large, the weather is unstable, and the intersection of north and south air quality also makes the rain increase at this time.