What does the weather forecast mean by "sunny and rainy"?

1, sunny to heavy rain;

2, sunny to heavy rain;

3. There is heavy rain between sunny days;

4. There is heavy rain between sunny days;

Sunshine and rain

Why is there sun and rain?

This phenomenon is called solar rain, which is caused by the collision of two high-altitude areas with different charges under the action of solar wind, resulting in excessive water vapor content in some areas and rapid evaporation of water vapor due to solar radiation. The rain that fell from the sky disappeared before it fell to the ground, so the weather looked fine, but it began to rain.

Weather forecast [[tiā n q ù y ù bà o] o]: Weather forecast is to make a qualitative or quantitative forecast of the weather conditions in a certain area or a certain place in the future by applying the principles and methods of meteorology, dynamic meteorology and statistics.