83 



o 



Monthly and Annual Mean Surface Water Temperatures, F 



1391 35.6 35.5 37.0 - 



(6) (7) (7) (5) (5) (6) 

 Mean 35.6 36.U 37. b liU.9 60.1 70.2 78. U 77.8 72.8 61.6 5l.7 UO.S 55.6 



Potomac River mouth. 



Readings at first high water and first low water after 7 a.m. 

 Source - USCFF 



