Annual totals of pan evaporation and rainfall are shown to be inversely correlated over much of inland Australia. The slope of the regression line is most negative in the interior of the continent and becomes less negative or zero near the coast. Over much of inland Australia the year to year variation in pan evaporation is greater than the corresponding rainfall variation. The relationships found may be used to determine the annual pan evaporation associated with annual rainfall totals.
R. D. Hoy (Thu,) studied this question.