81 



Monthly and Annual Mean Surface Vifater Taupe ratures, °F 



FORT WASHINGTON, MD., POTOMAC RIVER 38°42'45"N. 77°02»15"W. 



92 35.6 38.0 -_-_-__ ____ 



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

 Mean 35.7 38.0 41.5 55.0 66.7 75.8 79.5 78.9 72.8 60.6 48.6 37.7 57.6 



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

 Source - DSCFF 



