Take one plastic bucket with an opening diameter of 9¾”, leave it outside in a position where it can catch rainwater without being affected by un-natural conditions for the entire month of July, then measure the amount of rainwater it collects.

The result?
1½ Imperial gallons.

I have no idea how to convert this to inches of rainfall, but 1½ gallons is a lot, by anybody’s book.
Whatever happened to global warming?