THE BAHAMA ISLANDS 



119 



PREVAILING WIND DIRECTION. 



(The average number of days per month upon which the indicated wind prevailed.) 

 N. 



January 4.4 



February 4.3 



March 2.4 



April 2.5 



May 2.0 



June 0.8 



July 0.4 



August 1.1 



September 2.1 



October 3.2 



November 3.4 



December 3.9 



Year .... . 30.5 



67.2 109.1 



64.0 



33.6 



13.2 



6.7 



21.4 



17.6 



Converting the total frequencies for the year into percentages of the 

 total number of days in the year, we have the following as the relative fre- 

 quency from each direction : 



PERCENTAGE OF FREQUENCY OF WINDS. 



N. NE. E. SE. S. SW. W. NW. Calm. 



8 18 30 18 9 4 2 6 5 



WIND VELOCITY. 



A year's continuous record of wind velocity at the Bahama Cable Office at 

 Nassau shows the average hourly velocity from July 1, 1902, to June 30, 1903, 

 to have been as indicated in the following table. The winds are strongest and 

 steadiest in the winter and spring months, and lightest in the late summer and 

 early fall. In the diurnal period of the winds, the velocity increases steadily 

 from the early morning hours to a maximum near noon. 



DAILY WIND MOVEMENT AT NASSAU. 



From >-s 



9 a. m. to noon 10 



Noon to 6 p. m 10 



6 p. m. to midnight 8 



Midnight to 6 a. m 9 



6 a. m. to 9 a. m 9 



Hourly average 9 



(In miles per hour.) 



The average hourly velocity during the period from June 17, 1903, the 

 day of our arrival at Nassau, to July 7, 1903, as recorded at the Cable Office, 

 is as follows : 



