13-1 



12- 



11 - 



10- 



- 9- 



8- 



7- 



6- 



5 -J 



MONTHLY 

 SEASONAL 



ENVELOPE OF ONE 

 STANDARD DEVIATION 



•-1 , 



T I 



WINTER 



SPRING 



SUMMER 



FALL 



I \ \ 1 1 1 1 1 1 1 1 1 



Dec. Jan. Feb. Mar. Apr. Moy June July Aug. Sept. Oct. Nov. 



MONTHS 



Figure 9. Monthly average significant -/ave periods (Tg) compiled 

 from Virginia Beach gage (from Gutman, 1976j. 



40 



