474 



H. MOHN. METEOROLOGY. 



[NORW. POL. EXP. 



in March amounts to 16 and in January and February to 13. The mean 

 difference is 7. The mean surplus temperature of the clear (or half-clear) 

 days of July and August is only l'2. 



The following Tables show the diurnal period of the temperature of the 

 air in the form of (smoothed) differences from the diurnal mean, and the 

 minimum, maximum, range, mean ordinate and mean temperature for each 

 month and season, and for the year. 



