RAINFALL IN GUERNSEY DURING 1920. 



BY A. COLLENETTE, F.C.S. 



The year 1920 has proved a dry year. The total, 34*1 Gin. , 

 is 2*55 in. below the average. Notwithstanding this fact 

 there have been seven months with totals in excess of their 

 averages. If we exclude three of these months which have 

 surplnsses of less than half an inch each, we reduce the 

 number of really wet months to four. The months March, 

 June and December, together gave a total of 0*70 in. over 

 their average. Of the other wet months January, April, 

 July and September had totals which, combined, have an 

 excess of 4'78 in. The excess of the whole of the seven wet 

 months is 5*48 in. The dry months on the other hand had a 

 combined total of 8*03 in. The deficit of the year's fall is 

 thus 2*55 inches. 



Of the dry months, October and November stand out as 

 very dry, their combined deficit being 5 inches. These two 

 months should yield a quarter of the rainfall of the year 

 (25-4%), but they yielded only 12-4%. 



Although the year has, on the whole, been a dry one, it is 

 to be noted that, considered from the point of view of wet 

 days, it is to be ranked as wet. That is, although there is 

 2tj in. less in the total fall there is an excess of 15 wet days, 

 the inference being that the relative falls have been smaller. 



It often happens that the general character of the year 

 is not consistent with the conclusions derived from the 

 totals of the whole year, and that is the case this year, for 

 some days have added more than their proper share to the 

 total ; two days in particular, the 19th and 21st of September, 

 were of this character. Both these days had falls of over an 

 inch, but if we exclude these falls from September's total the 

 month would rank as a dry month instead of a wet one as it 

 stands on the table. Taking the whole of the detail into 

 consideration, the year is to be looked on as a very dry year 

 modified by a few exceptional very wet periods. 



The wet periods are to be found in the following 

 months : — 



