THE RAINFALL OF GUERNSEY FOR THE 



YEAR 1910. 



BY MR. A. COLLENETTE, F.C.S. 



A reference to last year's paper on the rainfall will 

 explain my reasons for believing in advance that 1910 would 

 be wet. The event has justified ; the foreeast for 1910 

 has proved to be nearly 10 inches in excess of the average 

 and the largest annual total since 1882. With these figures 

 before us we are justified in anticipating a smaller rainfall 

 for 1911, probably not lower than the average. 



Following the sequence of dry and wet years a little 

 further I have prepared a table (5) in which I have collected 

 the 10 years of lowest rainfall in the 68 years' records, and I 

 find that seven out of the ten were succeeded by two years of 

 successively greater totals. In the three exceptions the first 

 succeeding year is one of greater rainfall. 



It is possible that we have two or more short periods 

 overlapping and confusing each other, which may be dis- 

 entangled later. It is worthy of note that the means of these 

 years vary between the minimum and 1st year about 10 inches, 

 then the difference between the 1st and 2nd year falls to 

 3 inches. If we consider the 7 years which agree we find 

 that the rise from minimum to maximum is roughly 8 inches 

 in each successive year. 



The only very dry month in 1910 was September, which 

 was 2*65 inches below its average. On the other hand, 

 January, February, October and November were very wet, 

 the last month being over 6 inches in excess of its average 

 and proved to be the wettest November we have on record. 



There were several very wet periods, notably one at 

 the end of the year involving the last 83 days, out of which 

 74 were wet. Not only did it rain day after day, but 

 heavy falls were experienced in October and November; 

 three days in October gave 3*8 inches and three days in 

 November gave 3*1 inches (see Table 3). If we exclude the 

 rainfall of these 6 days we remove more than l-7th of the 

 total for the year. 

 [1910.] 



