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TRMM operated from 1997 - 2015 and carried the first on-orbit active/passive instruments to study tropical rainfall. 3B42* data production ended on 12/31/2019 ...more

An international satellite mission launched by NASA and JAXA on Feb. 27, 2014, that is setting new standards for precipitation measurements worldwide using a network of satellites united by the GPM Core Observatory. Get data


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IMERG Early Run image of the Earth displaying the last half hour of global precipitation rates

GPM Data

Get GPM Data logo - new users start here.

Precipitation data from the GPM and TRMM missions is made available free to the public in a variety of formats from several sources. This section outlines the different types of data available, the levels of processing, the sources to download the data, and some helpful tips for utilizing precipitation data in your research. 


Example screenshot from a Giovanni training session

Learn how to access and analyze global precipitation data in this series of training sessions. Register for upcoming training sessions and download videos and slides from past training sessions. Topics include: Overview of GPM data and tools, GPM data search and analysis, data import and analysis in GIS, using Python with GPM data, and more.


Screenshot from GPM launch animation

Photos and videos that tell the story of the Precipitation Measurement Missions. Watch the GPM Core Observatory being built and tested at NASA Goddard, learn about the science of measuring precipitation, and more.


Example of TRMM DPR data.

Through an advanced set of instruments, TRMM and GPM provide new information on precipitation characteristics and how rain and snow interact within the Earth system. This section explores how space-borne precipitation measurements are acquired, processed, and utilized.