DURING RAIN OR SNOW. 245 



low the average ; but there is a trace of a second maximum between 

 W.N.W. and W.S.W. 



The distribution of the winds during falls of which the amount is 

 less than one inch, will be found by subtracting the relative durations 

 in column (7) from those in column (6). The progression in the re- 

 sulting series, omitting minor irregularities, becomes single ; the max- 

 imum is decidedly between the three points "W.N.W., west, and 

 W.S.W., and the minimum is in the S.E. quadrant, the winds from 

 NJE. being well below the average. 



On comparing the four final columns in Table IV. we find that the 

 principal maximum at N.E., in column (10), increases rapidly in the 

 Mgher classes, and that the second maximum at or near west in col- 

 umn (10), disappears when the snow amounts to one inch. The north 

 wind continues above the average during falls of snow equal to or ex- 

 ceeding one inch, but falls below the average when snow amounting 

 to less than three inches is excluded, and is wholly absent when the 

 storms included are only those of six inches and upwards. It appears 

 further, by comparing Tables III. and IV., that although during some 

 part of the day in which a snow storm of the heaviest class takes place, 

 the wind may blow more or less from any point of the compass ; dur- 

 ing the actual fall of the snow the directions of the wind are limited 

 to the four points N.N.E., N.E., E.N.E., and east. 



The increasing frequency in the easterly group of winds from N.N.E. 

 through east to E.S.E., during the actual fall of snow, as more and 

 more of the lighter falls are excluded, and the diminishing frequency 

 of all other winds, are shewn by the averages of the corresponding 

 ratios, in the manner already employed with reference to Table III. . 



AVERAGE RATIOS. 



[j Class I. Class II. Class III. Class IV. 



j Five winds from N.N.E. to E.S,E. 1.41 2.16 2.59 3.22 

 I Eleven remaining winds, - 0.84 0.52 0.33 0.00 



