115 



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Monthly and Annual Mean Surface Water Temperatures, F 



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ST. JOHNS LIGHTSHIP, ST. JOHNS BAR, FLORIDA . 30 23.0'N. 81 18'W. 



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



1930 56.2 56.5 60.0 67.0 75.4 76.2 77.4 78.6 79.9 73-3 63.3 55-9 (68.3) 



1931 52.7 54Ji 56.7 63.6 71.4 77.9 81.8 77.7 80.6 76.0 69-7 67.6 (69.2) 



32 66.1 65.2 61.1 66.5 74.0 79.1 79.6 78.4 80.7 75-4 68.0 59.8 (71.2) 



33 59.6 58.8 61.7 67.6 75.8 78.9 81.6 82.7 83.6 76.4 - 65.5 (71.7) 



34 60.7 56.1 56.5 64.9 73.7 78.3 - - - _ _ _ _ 



(5) (5) (5) (5) (5) (5) (4) (4) (4) (4) (3) (4) 



Mean 59.1 58.2 59.2 65.9 74.1 78.1 80.1 79.4 81.2 75.3 67.0 62.2 70.0 



Readings at 8 a.m. and 6 p.m. 

 Source - USBF 



