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TRMM operated from 1997 - 2015 and carried the first on-orbit active/passive instruments to study tropical rainfall. 3B42* data will continue through mid-2017 ...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

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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. 

Mission Updates

Visit this section to get the latest news and updates about the GPM Core Observatory satellite, the constellation partners, and GPM and TRMM data products. Includes critical updates about data availability and new data products and tools.


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.


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.