 This paper presents a dataset of drought indices based on precipitation, atmospheric water balance, and soil moisture for 101 ecosystem sites from the Integrated Carbon Observation System, ICOS, with daily temporal resolution from 1950 to 2021. Additionally, it provides simulated soil moisture and evapotranspiration for each site from the mesoscale hydrological model, MHM. The authors validate their dataset with measurements from ICOS and discuss potential research avenues. This article was authored by Felix Pol, Old Rich Rakovec, Karina Rebman, and others.