The diurnal and seasonal variations of air temperat ure , air pressure , relative humidity , wind speed and wind direction f rom September 1 , 2006 to August 31 , 2007 were analyzed , using the observation data from an automatic weather station at the Lanong Glacier of the Nyainq ntanglha Range.The diurnal temperatures rise rapidly while descend slowly. The mean annual temperature is - 8. 1 ℃. The minimum temperat ure ( - 18. 2 ℃) occurs in December and the maximum one (0.3 ℃) occurs in July. The diurnal variation of relative humidity is characterized by a single peak and valley pattern. The mean annual relative humidity is 53.4 %. The maximum relative humidity occurs in August and the minimum relative humidity occurs in January. However , diurnal variation of air pressure shows a pattern of double peaks and valleys.The mean annual air pressure is 497.1 hPa wit h a maximum (501.9 hPa) in September and a minimum (489.9 hPa) in February. The diurnal variation of wind speed fluctuates more dramatically in the winter and spring than that in t he summer and autumn. The mean annual wind speed is 4.2 m·s^-1 with a maximum (7.5 m·s^-1 ) in J anuary and a minimum (2.5 m·s^-1) in August . The north and sout h winds prevail , which account for 75. 2 % of the year .