24 



Table 1. - Surface Water 

 Means and 



Years 



January February 



March 



April 



May 



June 



July 



Temp. Dens. Temp. Dens. Temp. Dens. Temp. Dens. 



Temp. Dens. Temp. Dens. 



1937 



1937 

 1952 



1952 

 1938-191;0 

 1939-191;0 



1937 



1938-19l;C 



Mean 



Maximum 

 Mean Max. 

 Mean Min. 



6.7 10.1 



,7 2.8 12.1; 2.3 11;. 2 1.2 



6.5 7.1; 8.5 1.2 12.3 O.l li;.l; 0.3 

 7.5 0.7 9.8 -0.2 10.7 -0.5 11;. 5 -0.3 



Temp. Dens. 



MARE ISLAND 



16.6 1.7 19.2 2.9 20.2 9.2 



BENICIA, CARQUINEZ 



16.6 0.5 19.6 1.0 20.9 2.5 



16.7 -0.1; 18.1 -0.2 19.1; 3-0 



7.0 -0.8 9.1; -0.8 10.7 -0.8 l5.1 -0.9 17-5 -0.7 



1.7 -0.6 9.1; -0.6 12.2 -0.3 15.9 -0.1; l8.5 -0.1 



10.5 -0.7 11.9 -0.8 11;. 8 -0.9 16.2 -0.6 20.1; -0.1 



PITTSBURG, NEW YORK 



i8.8 -0.5 20.5 -0.7 



THREEMILE SLOUGH, 



20.6 0.0 20.9 1.2 



PRISONERS POINT, SAN 



23.2 -0.6 



1;.8 -0.1 7.8 -0.5 12.1 -0.3 13.8 -O.l 



6.1; -1.0 9.3 -1.0 12.1 -0.7 l5.2 -0.7 



8.1; -1.0 9.3 -1.0 12.1 -0.7 l5.2 -0.7 



11 -0.7 12 -0.7 16 0.0 18 -0.2 



9.1; -0.8 11.1; -0.7 15.2 -0.3 17.8 -0.1; 



6.7 -1.1 8.1 -1.0 9.8 -1.0 12.1; -1.0 



COLLINSVILLE, SACRAMENTO 



16.6 0.1 19.8 -0.2 21.1 0.5 



RIO VISTA, SACRAMENTO 



17.6 -0.7 20.1 -0.8 21.1 -0.2 



17.6 -0.7 20.1 -0.8 21.1 -0.2 



21 -0.1 23 0.1 21; -1.5 



20.2 -0.1; 21.7 -0.2 21;. 2 0.6 

 15.0 -1.2 18.3 -1.1 18.3 -0.9 



'Observations for the year are incomplete; extremes are for the months shown. 



