398 SUNSHINE OF GUEKNSEY. 



excesses of November and December. November's excess 

 was 23*31 hours and December 9*51 hours. 



There is such a large difference between these months in 

 1903 compared with 1904, that it is worth while drawing 

 attention to it. 



1903. 1904. Difference. 



November 59*77 hrs 92*67 hrs 32*90 hrs. 



December 30*89 „ 52*66 „ 21-77 „ 



As 1904 is 159 hours in advance of 1903, and the differences 

 shown above amount to more than 54 hours, it will be seen that 

 the excess of sunshine of 1904 over 1903 is one-third due to 

 the surplus of these two months. 



In cloudy days, 1904 gave three more than the average. 

 August has one sunless day only in the averages. This year 

 it gave three. June in the averages has no sunless day. This 

 year it gave two. The excess is therefore chiefly owing to 

 these months. 



I have in previous years drawn attention to the wave-like 

 trace presented by the annual totals. I wish again to show 

 that the years '96, '97, '98 and '99 were ascending years, and 

 1900, '01, '02 and '03 were descending years. 1904 has again 

 begun the ascending curve. 



It is now only necessary for me to draw attention to the 

 tables for two items of interest. First, that 300 hours and 

 over were recorded in the summer months of '95, '96, '97, '98, 

 '99, 1900, that is during the upper part of the curve, before 

 '95 and after 1900 the sunniest month were below 300 hours. 

 Second, that although the mean daily sunshine varies from the 

 averages in most months, yet the annnal value of the daily 

 mean remains uninfluenced. The eleven years show that, so 

 far, we may consider that the daily mean of sunshine is 5*3 

 hours, but this varies in the different months from 1*4 hours in 

 December to 9*1 hours in July. 



The percentage of sunshine yielded by the different 

 months is as follows : — The mean year being taken for 100 

 January gives 2*6°/ , February 4*37 , March 7*3%, April 

 10*2°/ o , May 13*2%, June 13-4°/ , July 14*8%, August 12*8%, 

 September 9*9°/ , October 5*7°/ , November 3*6°/ , December 

 2-2*1 . 



