1898-1902. No. 4.] WIND -VELOCITY. DAILY PERIOD. 



229 



When the weighted means are plotted, it is only in a few months, 

 e. g. May and July, that a regular daily period appears. 



Taking the means for the seasons and the year, we get 



In winter and autumn there is no appreciable daily period, but in 

 spring and summer there is a decided maximum about, or some hours 

 after, noon, and a minimum in the early morning hours. 



The smoothed numbers for the mean for the year show a very 

 regular daily period with a 



Minimum 0.30 a. m. of 3.52 metres per second 

 Maximum 2.30 p. m. „ 3.80 „ - „ 



Range 



0.28 



