The average yearly rainfall on earth is a bit less than a meter. That would be about 80 mm per month. But then, there is the amount of water coming down and how often it happens. Both influence our lifestyle. read more
Rain is measured using a rain gauge (also known as a udometer or a pluviometer [Pluviograph ] which gathers and measures the amount of liquid precipitation over a set period of time. All rain gauges have their limitations. read more