Dear Rajat 

You can use IPCC SREX regions as theDomains considered in regional analyses based on the definition used in the IPCC Special Report on Managing the Risks of Extreme Events and Disasters to Advance Climate Change Adaptation:

Seneviratne S I, Corti T, Davin E L, Hirschi M, Jaeger E B, Lehner I, Orlowsky B. Teuling A J. Investigating soil moisture-climate interactions in a changing climate: A review. Earth Sci. Rev. 2010;99(3-4):125–161. and, doi: 10.1016/j.earscirev.2010.02.004.

Thanks sisira for your valuable answer..it will go thru it.

If you are after potential evapotranspiration then CRUT3.21 global dataset is available at .5 deg resolution for 1900-2012 period. See https://climatedataguide.ucar.edu/climate-data/cru-ts321-gridded-precipitation-and-other-meteorological-variables-1901.

For  evapotranspiration data & trends please see new paper in Nature's Scientific Reports - Multi decadal trends in global terrestrial evapotranspiration and its components. http://www.nature.com/articles/srep19124 free download

MODIS derived evapotranspiration data is available from http://www.ntsg.umt.edu/project/mod16

Thanks  Jozef sir, it will help me.

You can use MODIS dataset for evapotranspiration... For potential evapotranspiration data for whole India is available FROM IMD Water Portal...

Thanks Swain..