"Global precipitation" refers to the amount of rain, snow, sleet, or hail that falls all around the world. It includes all the water that comes down from the atmosphere onto the Earth's surface in any form of precipitation. Full definition
Moreover, the latest satellite observations of global precipitation indicate that more precipitation is generated than previously thought. (realclimate.org)
Global precipitation patterns are being moved in new directions by climate change, a new study has found. (scientificamerican.com)
So global precipitation seems to be increasing, and is expected to continue doing so. (realclimate.org)