Why is it raining god?

Why do rains always come when you are about to leave?
It rained wildly when you came as the old watchman
and left me with a handful of candies
Years after you came as the loving lady doctor
You introduced me as one of her children to someone
As you left every window pane was moist
Now you come in as a friend greeting me with a wide smile
Why is it raining again?