What Is It?

It keeps going going going and then gone
It keeps coming and going
When it leaves one place it go's to another
and its always happing
at least in one spot in every country
its doing its job
Dropping leaves like in a
Battle Feild
making it colder were ever it go's
wandering the world 24/7
It never stops
Its always somewhere
bring joy or sadness
Its always a Friend or Foe
What is it?
Its the _____
you will never know
because it blew away