days after the surface maximum. At Boston, Five Fathom Bank and Chesa- 

 peake, readings were the highest observed to date. The sudden warming 

 appears to be the direct result of northerly and northeasterly winds, force 

 4-6, which on September 11th and 12th, mixed the water column, cooling 

 the surface and warming the bottom. The thermocline, however, was 

 not completely destroyed until some weeks later. 



Table 1 



Surface Water Temperatures - Monthly and Annual Means 



for 1959 



Jan. 32.4 39.7 38.5 40.7 38.7 31.3 36.8 34.4 - 41.2 35.7 40.0 42.5 - 61.7 64.1 51.4 



Feb. 31.0 37.7 36.1 40.7 38.2 31.2 34.8 33.7 - 45.7 35.9 39.3 40.7 41.8 63.7 64.7 54.3 



Mar. 34.3 37.0 36.5 39.3 38.0 35.4 36.5 37.9 39.1 46.1 38.5 39.2 43.0 45.9 62.6 63.0 57.1 



Apr. 39.4 41.1 41.6 42.1 39.5 43.1 42.9 45.9 - 45.4 44.7 45.6 48.7 51.2 63.5 66.5 63.7 



May 45.1 45.9 49.2 49.6 43.9 53.1 49.7 53.7 - 49.9 - 55.1 59.0 59.3 73.8 72.7 73.4 



Jun. 48.1 49.7 55.9 54.5 48.6 61.8 57.3 62.2 - 58.8 - 65.2 68.9 68.9 78.9 78.9 80.1 



Jul. 53.6 57.5 59.8 58.1 53.8 68.7 63.4 67.5 68.2 65.0 69.0 71.8 74.0 74.6 82.1 81.7 83.9 



Aug. 56.0 58.9 64.4 - 54.7 70.8 65.6 68.6 70.7 65.6 71.4 - 74.8 77.2 82.4 82.4 85.1 



Sept. - 55.7 63.9 60.2 56.5 69.6 65.9 57.5 70.1 69.0 72.7 73.7 75.3 76.5 80.2 81.6 81.1 



Oct. - - 56.3 60.2 52.4 61.8 60.6 61.4 - 63.0 66.2 - 68.4 69.8 73.9 78.7 76.7 



Nov. - - 49.7 51.7 47.9 50.5 52.5 51.4 - 53.8 55.3 56.7 58.8 59.6 67.3 74.0 66.3 



Dec. - 43.6 44.8-47.0 42.3 42.2 46.4 43.8 - 49.8 - 48.9 51.3 50.2 65.3 67.0 55.4 



Ann. - - 49.7 - 46.2 51.6 51.0 52.4 - 54.5 - - 58.8 - 71.3 73.2 69.0 



