•c 



40 



20 



ni I I ] I I I J ] I I I I I I I I I M I I I I I I I I I I I I I I I I I I I I I I I I I I I I I I J I I I I I I I I I I I I I 



JMMJSNJMMJSNJMMJSNJMMJSNJMMJSNJMMJSNJMMJSNJMMJSNJMMJSN 



1958 



1959 



I960 



1961 



1962 



1963 



1964 



1965 



1966 



Figure 2. — Average monthly water temperatures for Clear Lake, Tex. (1958-66), and monthly average air temperatures 



recorded by the U.S. Weather Bureau 



o 



o 



CO 



K8h 



< 



q: 



a 7 

 < 



o 



z 

 < 



CD 6 



o 

 o 

 o 



14 15 16 17 IB 19 



ANNUAL TEMPERATURE VARIATION CO 



20 



21 



Figure 3. — Sum of the cooling and warming rates in relation to the annual temperature 

 variation in Clear Lake, Tex. (1958-66). 



Table 3. — Range in bottom salinity in Clear Lake, Tex., 1958-66 



= no data 



