1920.] THE RAINFALL OF GUERNSEY. 277 



The whole of January, February 8th to the loth inclu- 

 sive ; March 4th to the 16th, and from the 24th of March to 

 the 3rd of April ; April the 10th to the 17th ; July 1st to the 

 12th and from the 24th to the 31st ; September loth to the 

 21st ; September the 29th to October the oth ; November the 

 27th to December the 8th ; from December 16th to the 31st. 

 The wettest interval was from September the 15th to the 

 23rd, which totalled a fall of 4'24in., which is a higher total 

 for any month except January and December. 



September itself only added in the other 24 days an 

 additional 0*49in. to the fall of the nine days. 



There was no drought (that is a period of 14 days without 

 rain), but the driest nearly approached it, for it reached 12 

 days. This was in September. Another peculiarity of the 

 year is the absence of very large or small monthly totals, for 

 no fall reached o in. and none fell below 1 in. 



The heavy fall of the 19th of September fell in greater 

 amount over the centre of the island than over the coasts, and 

 although the town received \\ in. the falls diminished towards 

 the north until at Fort Doyle only half an inch was reported. 

 The next day, the 20th of September, there was a much more 

 equal fall, for at the States station the fall was 0*59 in. and 

 ranged between 0*75 in. and 0*25 in. over the rest of the 

 island. Fort Doyle reported 0*48 in. On that day, however, 

 two of the stations, Mont Saint and Rocquaine, reported only 

 0*25 in. each that day, therefore the rain was only half as 

 heavy on the west coast as over the island generally. 



Taking the days 18th-22nd inclusive, the wettest period 

 of September, we find the following distribution over the 

 island : — 



St. Martin's stations had a mean fall of 3*76 in. ; the 

 town stations a mean of 3*70 ; the central stations have a mean 

 of 3*72 ; the west coast stations gave 3*40 and the north 

 stations 2*72, with Fort Doyle as the lowest with 2*03 inches. 



These falls, therefore, fairly balanced each other, but the 

 influence of position is still evident. On these days the wind 

 directions were from practically all points of the compass, 

 and therefore each part of the island became the lee side, 

 hence the rule that the greatest fall is on the lee side is 

 confirmed by the comparatively equal totals. Taking the 

 percentages as found in the tables the rule is confirmed by the 

 annual totals, but there are points to notice. 



The excess of the total of Queen's Road is an indication 

 that the area of greatest rainfall is influenced by the topo- 

 graphy of the Ruettes Braye Valley, and in the case of the 



