129 



o 



Monthly and Anniial Mean Surface Water Temperatures, F 



ST. MARKS, FLORIDA 30 09'N. 8U 12'W. 



Year Jan. Feb. Mar« Apr. May June July Aug. Sept. Oct« Nov. Dec . Ann . 



1877 - - 6U.^ 68.7 72. U 76.5 79.2 76.7 76.7 70.6 6U.7 58.9 (68.9) 



78 56.U 60.1 65.9 69.5 73.2 77.1 79.9 78.5 75.9 70.9 65.7 59.7 69. U 



79 59.3 - 67.6 68.6 73.3 76.2 77.8 75.5 73.3 71.0 - - (69.0) 



(2) (1) (3) (3) (3) (3) (3) (3) (3) (3) (2) (2) 



Mean 58.1 6o.l 66.0 68.9 73.0 76.6 79.0 76.9 75.3 70.8 65.2 59.3 69.1 



Wharf in river 9 miles from Gulf of Mexico 



Readings at 3 p.m. 

 Source - USCFF 



