Clare Island Survey — Climatology. 



6 19 



and March have a small rainfall compared with July, August, October, 

 and November, and where August is the month with the greatest average 

 rainfall. 



I conclude my remarks on rainfall by giving Table XII, showing the 

 duration of the rainfall at Clare Island in 1911. The values are based on 

 the daily records made by the self-recording gauge or hyetograph which was 

 fitted up near the hotel in charge of Mr. J. J. M'Cabe. The records were 

 subjected to a very careful analysis by Dr. H. E. Mill, Director of the British 

 Eainfall Organization. They are in Dr. Mill's opinion the only records of 

 the kind available so far for the whole of Ireland, and are of some interest 

 apart from the present subject. The numbers were calculated and supplied 

 by the British Eainfall Organization. For references I give also the monthly 

 totals given by a standard Snowdon gauge, which was placed very near the 

 recording gauge, and also the mean monthly totals for Blacksod Point as 

 given in Appendix III to the Weekly Weather Beport. 



Table XII. 



- 



Jan. 



Feb. 



Mar. 



Apr. 



May. 



Jun. 



Jul. 



Aug. 



Sep. 



Oct. 



Nov. 



Dec. 



Annual. 



No. of hours of Rain- 

 fall at Clare Island, 

 1911, . 



SO-7 



88-4 



67-8 



87-3 



60-7 



51-4 



45-3 



65-1 



52-6 



65-8 



110-8 



131-9 



897-8 



Eainfall by standard 

 gauge at Clare 

 Island, 1911, 



3-25 



4-48 



2-26 



2-94 



2-82 



3-28 



4-02 



4-05 



2-64 



3-73 



6-34 



7-93 



47-74 



Mean Eainfall for 

 Blacksod, 1871- 

 1905, . 



4-94 



3-56 



3-83 



2-89 



2-69 



2-63 



3-02 



4-88 



4-26 



5-13 



5-29 



5-81 



48-93 



Opportunity must here be taken to express my obligation to Mr. J. J. M'Cabe, 

 Mr. P. Duffy, and Mr. McGreal, for their undertaking the daily observations 

 of rainfall for nearly two years. Mr. P. Duffy, the lightkeeper, was also 

 responsible for general meteorological observations. 



6. Sunshine. 



The information available for a report on the duration of sunshine on 

 Clare Island and district is very poor. The nearest station for which 

 sunshine records exist is Markree Castle (Sligo) ; and the conditions there 

 are such as to make a close parallel with Clare Island area quite impossible. 

 In the official publication No. 98 of the Meteorological Office there is given 

 a summary of " Ten Years' Sunshine in the British Isles, 1881-1890." The 



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