The paper presents results of potential evaporation measured by the use of class A pan evaprimeter for the period 1997-1999 in Ursynów WAU and Wild evaporimeter for period 1961-1963 in Przemyśl. Mean monthly sums daytime and night-time evaporation (state on the base of sunrise and sunset time) of class A pan evaporimeter are presented in table 1. Mean rate of night-time evaporation amounts 7,7% for class A pan evaporimeter and 13,5% for Wild evaporimeter and rate of daytime evaporation for these instruments amounts 92,3% and 86,5% respectively. Conduction of evaporation measurement at noon sharp allows to compare values of forenoon evaporation (AM) to afternoon evaporation (AM). Forenoon evaporation is 50% less than afternoon one for Wild’s evaporimeter and 80% less for class A pan evaporimeter.
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