The world precipitation rate is the average amount of water (rain, snow, sleet, or hail) that falls from the atmosphere back to Earth, measured across the planet over a given time (per year, per day, or per hour). It can be expressed as: Total volume of water (in km³ per year) Depth equivalent (in mm/year over Earth’s surface) Rate (e.g., mm/day or mm/hour when averaged) 1. Global Average Annual Rainfall On average, about 505,000 km³ of water falls as precipitation each year: 398,000 km³ over oceans 107,000 km³ over land (Wikipedia – Precipitation) This translates to an average global precipitation of: ~990 mm per year across Earth’s surface ~715 mm/year over land only Alternative estimates put the figure slightly lower at ~954 mm/year (~486,000 km³ total precipitation) (Wikipedia – Earth Rainfall Climatology) Converting to a Rate 990 mm/year ≈ 2.71 mm/day ≈ 0.11 mm/hour 954...
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