412 
BULLETIN OF THE BUREAU OF FISHERIES 
The total precipitation at the Kodiak weather station was 195.8 centimeters 
(77.08 inches) in 1926; 151 centimeters (59.47 inches) in 1927; 167.1 centimeters 
(65.79 inches) in 1928; 135.7 centimeters (53.42 inches) in 1929; and 119.3 centimeters 
(46.99 inches) in 1930. 
Karluk Lake is usually covered with ice in winter; it freezes over during the 
latter part of December and opens again some time in April. In 1931 the lake became 
free of ice on April 20. In very mild winters, such as that of 1925-26, the lake does 
not freeze, but this is reported to happen only once in about 20 to 25 years. 
Table 4 shows the results of the temperature readings obtained at station 1 , which 
is situated in the deepest part of Karluk Lake. The surface temperature ranged from 
1929 ( J ); September 8, 1929 (S); July 12, 1930. The temperatures are indicated in degrees centigrade. 
Note the definite stratification in 1926 
about 10° C. (50° F.) in early July to a maximum of 15.6° C. (56° F.) about the middle 
of August; the highest temperatures were found during the Warm summer of 1926. 
In this year the three thermal strata of the lake were well marked. The epilimnion 
extended from the surface to a depth of about 8 meters on August 15, 1926; the 
thermocline extended from 8 to 15 meters and the hypolimnion from the latter depth 
to the bottom. The epilimnion and thermocline were not so definitely outlined in the 
otherjj’years. 
: "i Six sets of the temperature readings for the upper 30 meters are shown in Figure 2. 
The readings taken on July 12, 1930, show the lowest surface temperature and those 
