338 



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



November. 



December. 



31 

 31 

 31 

 31 



124 



As they stand, the numbers indicating the probability of precipita- 

 tion (p. c.) for each even hour in the various months, do not show any 

 regular daily period. The pei'iod of 4 years' observations seems to be 

 too short to obtain a definite result for a single month. By taking the 

 means for the seasons and for the year, we seem to be better off, as 

 the following Table shows. 



The seasons show a double diurnal wave, maxima in the forenoon 

 and evening, and minima at midnight or in the early morning hours, 

 and a few hours after noon. The means for the year, particularly the 

 smoothed means, indicate maxima at 8 a. m. and 6 p. m., and minima 

 at midnight and at 1 p. m. The range for the year is 1.2 p. c. 



