244 DURATIONS OF THE DIFFERENT WINDS 



S.W., all inclusive, the duration of the other winds being below the 

 average. The progression is double, the chief maximum being at west 

 and the principal minimum at about south or S.S.W., with a second 

 maximum at N.E. and a second minimum at or near N.W. 



This apparent predominance in the relative frequency of west winds 

 is due to the lighter falls of snow. By subtracting the numbers in (7) 

 from those in (6) and taking the average of the remainders, it is found 

 that the winds above the average lie between N.N.E. through west to 

 S.W., all inclusive, the N.E. wind being slightly below the average and 

 the west wind occurring more than twice as frequently as the N.E. 

 wind. The progression becomes single, the maximum being at west, 

 and the minimum about S.S.W., with a sudden drop between S.W. 

 and S.S.W., as well as another between N.E. and E.N.E. 



Comparing the four final columns of Table III. we find that the 

 second maximum at N.E. in column (10) becomes very decidedly the 

 principal maximum in column (11), wherein snow amounting to less 

 than one inch in the day is excluded, and increases greatly as the 

 storm becomes more heavy. The west wind also, which was the prin- 

 cipal maximum when light snow was included, is now decidedly below 

 the average, and rapidly decreases in frequency in columns (12) and 

 (13). The north wind maintains a more than average frequency till 

 the falls of snow are limited to those of six inches and upwards. 



The progressive increase in the predominance of winds from the five 

 points N.N.E. through east to E.S.E., in passing from Class I. to Class 

 IV., and the diminished frequency of other winds, are made apparent 

 by the averages of the ratios for the former five points, and for the re- 

 maining eleven points. 



AVERAGE RATIOS. 



Class I. Class II. Class III. Class IV . 



Five winds from N.N.E, to E.S.E. 1.00 1.70 2.10 2.55 

 Eleven remaining winds, - 1.04 0.74 0.57 0.35 



In Table IV. the distribution of the winds is shewn during the hour» 

 in any part of which snow fell. 



When no distinction is made between falls of widely difi'ererit 

 amount, it is seen by column (10) that the winds from north to E.N.Eo 

 are decidedly above the average, the most prevalent wind being from 

 N.E; For the other points of the compass the winds are mostly be- 



