58 



H. MOHN. METEOROLOGY. [2nd. arc. exp. fraM 



The highest observed pressures are 



The means show an annual period with maximum in February and 

 minimum in August. The highest observed pressure is 793.2 mm., on 

 the S*!' February, 1902, 4 and 6 a. m. Temperature —36° and — 35°.2, 

 calm. 



The differences between the mean highest and lowest pressures in 

 each month are 



Jan. Feb. March April May June July Aug. Sept. Oct. Nov. Dec. 

 36.0 38.5 31.9 25.9 17. 1 18.9 15.5 14.2 23.2 22.6 30.5 34.5 



The oscillation of the pressure is greatest in February and least in 

 August, greatest in winter, least in summer. 



