Meteorological Observations at Hudson^ Ohio. 327 



The Hanover observations embrace but nineteen months, be- 

 ing all which are in my possession. In this register the column 

 headed 'cloudiness' is sometimes entered 'fog.' In taking the 

 average I have called such an entry 10, which probably is some- 

 times too great. This is the reason why the cloudiness at sun- 

 rise in the warm months appears so high. Such entries, how- 

 ever, are not made for either of the other hours. The two sets 

 of observations being made at different hours, are not very well 

 suited for comparison. Those, however, at 1^ and 3 P. M. may 

 be regarded as made about simultaneously. The cloudiness then 

 at Hudson is somewhat more than half greater than at Hanover. 

 Nearly the same ratio exists throughout the entire year, but is 

 somewhat greater in winter, when it is nearly as two to one. 

 This is a very striking result, and exhibits an important feature 

 of this climate. The Lake country in this respect resembles the 

 western coast of Europe, and probably for a like reason. 



The following table exhibits the average number of days for 

 each month in which the sky was perfectly clear at the hours 

 named. When the clouds cover less than one twentieth of the 

 visible heavens, the cloudiness is called 0. 



