142 HISTORY OF CALIFORNIA. 



rature at San Francisco during the six months from 

 October to March inclusive; a variation of only 

 eight degrees in the monthly mean, and a mean 

 temperature for the six months of 51 degrees. 



" At Monterey, we find the mean monthly tempera 

 ture of the seven months to have been 58. If we 

 take the three summer months, the mean heat was 60. 

 The mean of the three winter months was a little over 

 49; showing a mean difference, on that part of the 

 coast, of only 11 between summer and winter. 



" The mean temperature of San Francisco, for the 

 three winter months, was precisely the same as at 

 Monterey a little over 49. 



"As these cities are only one degree and a half 

 distant from each other, and both situated near the 

 ocean, the temperature at both, in summer, may very 

 reasonably be supposed to be as nearly similar as the 

 thermometer shows it to be in winter. 



" The mean temperature of July, August, and Sep 

 tember, at San Diego, only 3 53' south of Monterey, 

 was 72. The mean temperature of the same months 

 at Monterey was a little over 59; showing a mean 

 difference of 13. 



" This would seem to indicate that the cold ocean 

 current is thrown off from the southern part of the 

 coast by Point Conception, and the islands south of 

 it ; and consequently its influence on the climate of 

 San Diego is much less than at Monterey and San 

 Francisco. 



" At Los Angeles, 40 miles distant from the coast, 

 the mean temperature of the three months was 74; 

 of the three autumn months, 67; of the three 

 winter months, 57. 



"At Suttersville, about one hundred and thirty 



