DIFFERENT WINDS AT TORONTO. 18 



MEAN VELOCITIES OF THE WIND IN DIFFERENT DIRCTIONS. 



From table V. which includes only the winds at the six observation 

 hours, we learn that the wind has a maximum mean velocity of 10.90 

 miles per hour when it blows from N.W., and a minimum mean velocity 

 of 5.22 miles when it blows from S.E. There is an interruption to the 

 continuity of the progression amounting to a second maximum at about 

 E.N.E. and a second minimum at about N.N.E. 



ANNUAL DISTRIBUTION OF THE DIFFERENT WINDS WITH RESPECT 

 TO DURATION. 



The results given in tables I. to IV. depend on the velocities as well 

 as on the durations of the different winds ; and as the average veloci- 

 ties in some directions are much greater than in others, these tables 

 convey but indirect information as to the comparative prevalence of 

 the different winds with respect to their duration. To supply this 

 want tables VI. to IX. are given which were computed in the follow- 

 ing manner. 



From the monthly abstracts which give the direction of the wind 

 during every hour of every day, tables for each month in the seven 

 years 1853 to 1859 were formed, containing the number of times 

 during like hours that the wind blew from each of the sixteen princi- 

 pal points, as well as the number of absolute calms in each group of 

 like hours. By combining these tables the two following auxiliary 

 tables were prepared. 



Table (A) giving the absolute durations in hours of the different 

 winds and of the calms for the several months, each month embracing 

 the observations of seven years. 



Table (B) The absolute durations of the different winds and of the 

 calms for each of the twenty-four hours, each hour including all the 

 winds recorded for that hour in the seven years. 



Table VI. is derived from table (A) by expressing the absolute dura- 

 tion of each wind in each month and in the year, in terms of the monthly 

 and annual mean durations for all winds. It is designed to give, for 

 each month separately, and for the year collectively, a comparative 

 view of the duration of the different winds. 



It appears that winds from between S.S.W. and north have a more 

 than average duration as compared with other winds taking the year 

 round; but it is only those from N.N.W. whose duration exceeds 



