The study looked at summer monsoon rainfall on the northern slopes of the Tanggula Range in Tibet. Data from 1998 showed that the monsoon started around June 7 and lasted for 104 days, with 81 days of rain totaling 279.2 mm. The heaviest rainfall occurred in August, with a 5-day cycle of active and break phases. Local convection clouds were important for both the amount and frequency of rain at the observation site.