How's the weather?

I read a book whose title was "How's the weather?".
This book told us how complicated the weather is! There are many types of weather.
what is it that causes the weather changes? Weather is the temporary state of the earth's
atmosphere. It can be different from place to place. This is because the weather depends on
the complex relationship between the air, water and heat from the sun.
The weather also depends on the movement of the earth. The cool air from the poles drops
down and flows toward the equator. The warm air near the equator rises and flows toward
the poles. Air moves quickly across the earth's surface.
I think good understanding of the weather will help us to decide our plan!!