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This study is based on 3 years daily observations of upper air of Tehran (35No) during 1964-66. The author identifies the characteristics of Tehran tropopause and investigates the relationships of Some, of these characteristics with the temperature and pressure of the surface. The altitude of the tropopause changed between 5.7 and 19.2 km; in 57 percent of the cases the tropopause altitude was between 10-13 km. Average daily change of tropopause altitude was about 1 km. The fluctuation of thedoi:10.54302/mausam.v25i3.5250 fatcat:re5qqxhckbg4xpksvibe6ycuwm