48 



RESULTS OF METEOROLOGICAL OBSERVATIONS 



The greatest number of fair days (every second one), and the least number of 

 cloudy days (every sixth one), occur in July ; the least number of fair days (every 

 third one nearly), and the greatest number of cloudy days (every third one nearly) 

 occur in November ; the variable days in »ach month differ but little from their 

 average value (every third day nearly) throughout the year. 



The dependence of rainy (or cloudy v^^eather on the direction of the wind has 

 already been stated ; the relation of fair weather to the wind has been made out in 

 the same manner from 4085 fair days between 1807 and 1814, and between 1850 

 and 1855. 



Table XVI. — Showing the Dependence of Fair Weather on the Direction of the Wind for the 

 half year April to September inclusive, for the half year October to March inclusive, and for 

 the whole year. 



Season. 



S. 



s. w. 



w. 



N. W. 



N. 



N. E. 



B. 



S. E. 



April — September . 

 October — March 



5 



2 



42 

 20 



8 

 11 



32 



52 



4 

 5 



5 



7 



1 

 1 



3 



2 



Year 



3 



31 



10 



42 



5 



6 



1 



2 



Thus in every hundred fair days, during the half year including winter, there are 

 42 with S. W. wind ; and in every hundred fair days, during the half year includ- 

 ing summer, there are 52 with N. W. wind. There is but one day in a hundred 

 when fair weather is accompanied with E. wind. 



In the above diagram the tabular numbers for the year have been thrown into a 

 curve. Comparing it with the diagram given for the relation of rainy or cloudy 

 weather to the wind, it will be seen to be nearly the converse of it. 



