Sandwiched between two of the world's most famous deserts - the Namib and the Kalahari - Namibia is the driest country in sub-Saharan Africa, with less than 370mm ofrainfall on average each year.
This assumes that population growth continues its pace, that people keep flushing toilets and filling pools, and that California rainfall doesn't rise much above its averageof 24 inches per year.
India's weather department defines normal monsoon as seasonal rainfall between 96% and 104% of the long-term, or 50-year, average, which is 89 centimeters currently.