290 



H. MOHN. METEOROLOGY. 



[NORW. POL. EXP. 



The differences between the means for the hours of observation and 

 the means for the month, give a series of numbers for each hour of obser- 

 vation, expressing the diurnal period of the velocity of the wind for each 

 month. These numbers are given in the following Table for each month 

 of each year. 



