Hi,

Here the webpage of the European Drought Observatory from the EUropean Commision

http://edo.jrc.ec.europa.eu

The drought is calculated in a severity index, for that exist a lot of programs or software that calculate the index if you have a data base of precipitation, temperature, evaporation or evapotranspiration of one area specifically. Some names are SPEI (Standardized Precipitation-Evapotranspiration Index), SPI (Standardized Precipitation Index) or the PDSI (Palmer Drought Severity Index). For the above, that's programs are other options to generate you own data base of drought but before you need validate the weather data base to calculate the index of your interest.

Hi

You can use DMAP software for calculation PDSI for any point or region all over the world based on CRU dataset. DMAP has a database with 0.5deg*0.5deg scale. The user of DMAP can use inner database or user database by using excel, text, csv, Netcdf files.

http://www.agrimetsoft.com/Drought%20Monitoring%20And%20Prediction.aspx

Cheers

http://www.cru.uea.ac.uk/cru/data/drought/