A start would be the Global Precipitation Climatology Centre's monthly precipitation dataset (1901-present), available at NOAA http://www.esrl.noaa.gov/psd/data/gridded/data.gpcc.html#detail or from the Deutscher Wetterdienst http://www.dwd.de/DE/Home/home_node.html . Check NASA for satellite data; http://www.nasa.gov/content/earth-missions-list . 

Some starting points:

http://tinyurl.com/zvuj3dr

http://tinyurl.com/j55cam4

Hi fellow researchers, I need a research partner in drought research that uses drought indices, I have some data that can be used in drought analysis for research articles, Anyone out there?

see the ECMWF reanalysis archive, all the data are freely available:

http://apps.ecmwf.int/datasets/

Hey,

For precipitation look at GPCC dataset and ERA-Interim Reanalysis:

- http://www.esrl.noaa.gov/psd/data/gridded/data.gpcc.html

- ftp://ftp-anon.dwd.de/pub/data/gpcc/html/download_gate.html

- http://apps.ecmwf.int/datasets/

Other precipitation datasets can be found here:

- http://cdiac.ornl.gov/climate/precip/precip_table.html

- http://nsidc.org/data/search/#keywords=precipitation

- http://waterportal.ceos.org/

For NDVI, check the following :

http://eos-earthdata.sr.unh.edu/data/data34.jsp  (for USA)

https://earthdata.nasa.gov/earth-observation-data/near-real-time/rapid-response/modis-subsets (... require processing from surface reflectance)

If you are interested also in soil moisture data, these are some useful links :

- http://www.esa-soilmoisture-cci.org/node/145

- http://nsidc.org/data/search/#keywords=soil+moisture/sortKeys=score,,desc/facetFilters=%257B%257D/pageNumber=1/itemsPerPage=25

- Basin-Scale Water-Balance Dataset (BSWB) of ETHZ

especially for precipitation, you can use TRMM data NASA

Thanks to all for such a valuable information....

To B. Hlalele:

Recently I added 4 centennial-long global gridded Data-sets of the SPI-1, SPI-3, SPI-6 and SPI-12 obtained from the GPCC, ERA-20C, "Terrestrial Precipitation: 1900-2010 Gridded Monthly Time Series of the Department of Geography of the University of Delaware" and NOAA-CIRES 20CR at ftp://xeo.cfd.meteo.bg/SPI/ for free download. See the readme for details.

Best wishes, Hristo

Dear Muhammand

You may take a look to this NOAA dataset

http://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis.surfaceflux.html

There you will find what your looking for.

Best wishes

What about Senamhi in Bolivia