I have a theory.

Its raining outside my house, therefore, its raining everywhere.  You may not think that this makes much sense, since the world is a a pretty large space and all that, but, the REAL world is in front of my own eyes.  Since all 3 of you who are reading this are online and in contact with me, I can see you. From this, I can safely assume that it is raining where you are too.  You are in plain site, after all.