Boston Lightship 



Mean surface temperatures for 1956 exhibited little departure 

 from the means for the period 1925-19iil (Bumpus, 1957) except for the 

 last of May and early June which were several degrees cooler and the 

 last of July and first two-thirds of August which were several degrees 

 warmer than the means for the period of record. The autumn temperatures 

 cooled more slowly than the mean. 



Water temperatures at thj s position ranged from slightly 

 less than 37°"^, surface to bottom, in March^ to 680F at the surface in 

 August and almost 52oF at the bottom in October. Ihe thermocline was 

 well developed from mid-June to mid-September, 



Surface salinity ranged from 32.5°/00 in January to 30.5°/00 

 in mid-June with recovery to nearly 32.0°/00 by the end of the year. 



Bottom salinities were 1/2 to 3/li o/OO higher than the surface 

 salinities during the period of thermocline development, but generally 

 tended to follow the surface salinity at each end of the year. 



Figure 5. Boston Lightshio, 1956. 

 .192 5-l°l4l) 



(Dashed line in upper diagram, mean for period 



26 



