The annual frequency of western North Pacific (WNP) typhoons and the number of landfall typhoons in China are shown to negatively correlate with the Tibetan Plateau snow cover (TP-SC) during the preceding winter and spring. When TP-SC was above normal, fewer typhoons formed in the WNP and made landfall in China, and vice versa. The observed seasonal lag correlation between the TP-SC and the WNP typhoon activity suggests the existence of a seasonal memory of the East Asia -- West Pacific regional climate system which provides a means for the seasonal prediction of WNP typhoon activity and typhoon landfall frequency in China.