330 



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



The numbers in the last row for each month indicate the daily period 

 of the amount of cloud. It will be seen, that the months October to 

 March have a well-defined regular daily period with a maximum about 

 2 p. m. and a minimum in the night. The months April to September 

 do not show any appreciable or regular period. Taking the means for 

 the meteorological seasons, we get the following results: 



By smoothing these numbers, we have. 



The winter months, with the relatively clear sky, have the greatest 

 daily range, and the summer months, with the heavier amount of cloud, 

 have a very small daily range. In all seasons the sky is more cloudy 

 during the day than during the night. The maximum for the year falls 

 at noon, the minimum at midnight. 



