system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Is it possible for there to simultaneously be no rain everywhere in the world?

Follow-up question: Is it also possible for it to simultaneously rain everywhere?
gpt
Like most physical problems the funnest way to deal with them is the extremes.

When it comes to not raining yes it is absolutely possible for there to be a moment in which it is not raining anywhere in the world.

However the follow up question is different...  If literally cannot be raining everywhere on the world at any given time because of the north and south poles.  Interestingly the north pole - very occasionally - gets above freezing so you could have rain falling.  The south pole is much colder however.  The highest temperature ever recorded there was negative 12 degrees Celsius.  Thus it couldn't rain... only snow.