Clare Island Survey — Climatology. 



6 7 



records was made for the purpose of determining if strong winds are more 

 or less frequently recorded by night than by day, and if any evidence existed 

 to show a general tendency towards a change in intensity or in direction of 

 the wind in passing from day to night. A definite decision on these points 

 would be of considerable meteorological importance, and would also be of 

 general interest. It seems that popular opinion is inclined to the view that 

 the wind drops in intensity towards the evening, and yet that severe storms 

 are more frequent at night. 



The following tables, which embody the results of our analysis of Clare 

 Island records, would seem slightly to support the latter view, but not to 

 justify the former. It is, moreover, evident that there is no very striking 

 difference between day and night as regards the prevalence of strong winds ; 

 nor is there evidence of any marked tendency of the wind to change in 

 direction or in intensity at nightfall. The results are, however, sufficiently 

 significant to merit consideration. 



Table IV. 



The Percentage-Frequency far each Month and for the Year of Winds of different Intensity 



by Day and by Night. 



- 





Jan. 







Feh. 



Mar. 



Apr. 







May. 







Jim. 





Day, 



11 



35 



4 



16 



30 



4 15 



32 ! 3 



18 



31 



1 



25 



24 



■ 



28 



22 







Night, . 



10 



35 



5 



16 



29 



5 i 16 



31 3 



17 



31 



2 



25 



24 



1 



28 



22 







- 



Jul. 



Aug. 





Sep. 



Oct. 







Nov 







Dec. 





Day, 



26 



24 







21 



28 1 



24 



25 



1 



18 



30 



2 



17 



31 



- 



12 



34 



4 



Night, . 



26 



24 







22 



27 1 



" 



26 



1 



i; 



31 



2 



16 



31 



3 



11 



34 



5 





L. 



M. 



S. 



L. 



M. S. 



L. 



M. 



S. L. 



11. 



s.| 



L. 



M. 



S. 



L. 



11. 



s. 



Light. Moderate. Strong. 



Annual Day, 19-2 28-8 2-0 



Night, 18-9 28-S 2-3 



Table IV shows the percentage-frequencies of the winds of each of the 

 three grades of intensity for the day and the night periods for each month. 

 The light and moderate winds are practically equally distributed over day 

 and night. The strong winds were found in the ease of each month (excepting 



