6 6 



Proceedings of the Royal Irish Academy. 



winds of Class II as moderate. It will be seen on inspection that the length 

 of the thick portion of the radial line, as measured from the inner circle, 

 represents the percentage-frequency of the moderate and strong winds, and 

 the length of the thin line measured from the end of the thick one represents 

 the percentage-frequency of the light winds. 



Table III. 

 The Frequency of Occurrence of Winds of different Intensity as Percentages for each Month. 



- 



Jan. 



Feb. 



Mar. 



Apr. 



May. 



Jun. 



Jul. 



Aug. 



s„ 



Oct. 



Nov. 



Dec. 



Annual. 



Light, . 



21 



32 



31 



35 



51 



56 



52 



43 



48 



33 



32 



23 



38% 



Moderate, 



70 



60 



65 



62 



48 



44 



48 



55 



50 



63 



63 



69 



58 „ 



Strong, . 



9 



S 



1 



3 



1 











2 



2 



4 



5 



8 



4 „ 



Conclusions. 



A study of the tables and graphs will show that : — 



1. The most prevalent winds are those from the W., SW., and NW. 



2. The SW. is particularly prevalent in January and, February. 

 The N. is particularly prevalent in May and June. 



The E. is particularly prevalent in May, September, and November. 



3. The wind is more frequently moderate than light, except in the months 



of May, June, and July. (See Table III.) 



4. Moderate and strong winds are particularly prevalent in January 



and December. 



5. Strong winds or storms occur most frequently in January, February, 



and December. They are rare in June and July, in which months 

 also the light winds are more prevalent than the moderate (see 

 Conclusions, section 3). 



6. Calms are rarely recorded in October and November. 



7. Strong winds or storms are most frequently from the NW. in January 



and December, and from the W. in January, February, March, 

 April, October, November, and December. They usually occur from 

 the S. only in February, and from the N. only in November. 



It has been mentioned previously that an investigation into these wind 



