This quiz had me scratching my head, because there are parts of some countries that get enormous amounts of rainfall, whereas other parts of the same country get very little. For example, the USA has some spots in Hawaii and in Washington State that have staggering amounts of precipitation, but the USA also has places such as the Great Basin that get very little. Chile has the Atacama Desert, but the far south of Chile is a very wet place indeed. I suppose the people who figure these things out must perform some sort of calculation whereby the rainfall is distributed across the whole of each country, and then divided by the total area, or something like that.