686 



H. MOHN. METEOROLOGY. 



[NORW. POL. EXP. 



FOG. 



The probability of Fog has been computed in the same manner as that 

 of precipitation (p. 529). In the winter months, December, January and 

 February, no fog has been observed. As the single months showed no very 

 regular march of the diurnal period of the frequency of fog, I have taken 

 the means for each of the three other seasons in order to find the character 

 of this period. 



DIURNAL PERIOD OF THE PROBABILITY OF FOG. 



Deviations from Mean. Tenthousandths. Smoothed. 



Spring has minima at midnight and at 3 p. m. 



maxima - 10 a. m. - - 9 p. m. Range 0'0070 

 Summer a minimum at 2 p. m. 



- - maximum - midnight. 0-0614 

 Autumn - - minimum - 9 a. m. 



- maximum - 10 p. m. 0-0225 



