i9i°] McEwen: Preliminary Hydrographic Rt port. 195 



THE SAX DIEGO REGION Ol'TSIDE THE BAY. 



During the summer of 1908, from June 12 to July 28, three 

 hundred and eighty-eight temperature and three hundred and 

 forty-two density measurements were taken. Forty-three tem- 

 peratures were less than HI..") . The minimum temperature was 

 15°, the maximum was 22.5°, the average for the season was 

 18.99°. The minimum density was 1.02467. the maximum was 

 1.02520, the average fur the season being 1.02591. The average 

 temperature increased at the rate of about .7° per week from 

 .June 12 to July 28. The following table shows the hourly and 

 weekly averages of temperatures: 



During the summer of 1909, from June 8 to July 27. one 

 hundred temperature and density measurements were taken ; five 

 temperatures wen' less than 1(3.7°. none were less than 15.6°. 

 The minimum temperature was 16.3°. the maximum was 20.8°, 

 the average for the season being 18.70 . The minimum density 

 was 1.02479, the maximum was 1.02492. The average temper- 

 ature increased at the rate of about 0.3° per week from June 8 

 to July 25. The following table shows the hourly and weekly 

 averages : 



