The paper describes the results of estimations of potential evapotranspiration (Ep) in Iceland using Penman's equation. The calculations are based on distribution maps for global radiation for the period 1958-1967 previously developed by the author, and meteorological data from 28 weather stations for the same period. The distribution of Ep for the year and for the summer (April-September) are mapped. Further, the difference between precipitation and potential evapotranspiration (P-Ep) is calculated and mapped for the year as a whole and for the two periods April-September and May-August according to the values of Ep and precipitation normals (P) for the years 1931-1960.
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