Seasonal weather variations in Khumbu Himal are described on the basis of two full years of data (April 1973 to March 1975) at Lhajung station (4420 m). The data used are mainly the daily record of cloud, precipitation and moisture content, and the 500 mb weather charts. It is suggested that each stage of seasonal weather variation in the high-altitude Himalayas in Nepal is mainly affected by : i) The Tibetan High in the monsoon season and the subtropical jet stream in the other seasons. ii) The moisture supply to this region from the Indian Ocean. There are also strong year to year variations depending on the strength of the subtropical jet stream and the Tibetan High.