Dear Wojciech,

The Joint Research Centre of the European Commission maintains the European Drought Observatory here:

http://edo.jrc.ec.europa.eu/edov2/php/index.php?id=1000

The same group also keeps track of drought in Africa here:

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

In the USA, multiple organizations and universities are actively monitoring drought on a continuing basis, including

https://www.ncdc.noaa.gov/temp-and-precip/

https://www.drought.gov/drought/

http://droughtmonitor.unl.edu

I hope these examples (among many others) may be stimulating. Cheers, Michel.

Thank you for linking some interesting pages on this topic.

Some of them I didn' know.

Regards, Wojciech

Here are two projects from Spain. 

http://spei.csic.es/map/maps.html#months=1#month=6#year=2017

http://www.globalclimatemonitor.org/

Thank you for interesting example. Monitoring drought in Spain is important because of the fire risk of forests.

http://www.trockenheit.ch (from Switzerland, WSL)