Abstract: In this paper a statistical miethod is devised for the objective monthly rainfall forecasting. From the study of numerical associations between rainfall of the present month and different meteorological elements of the previous month for the same station, we have arrived at a series of critical values which may be used as forecasting tools. The monthly rainfall at Mukden, chosen as an example, is forecasted by the combination of a set of 21 critical values., The accuracy of forecast. exceeds 75%.