346 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 
The following table and diagram, of observations upon the temper- 
atures of water and air in the Golden Gate, at 7 a. in., for ten years, 
1874 to 1883, are taken from Davidson’s “ Pacific Coast Pilot.” 
Table showing the temperature of the water and air in the Golden Gate for 10 years, from 
IS74 to 1883, inclusive. 
° [Observations taken daily at 7 a. m., and reduced to monthly means. } 
| 
Months. Water. Air. | Water—Air. 
January:..-.-...-- 50. 49 46. 89 +3. 60 
Hebnuanyiesseeee == 50. 99 49. 21 +1. 78 s 
Marchys-teo- 2552 52. 49 51. 98 +0. 51 
April ites teccees- 54. 28 54. 72 | —0. 44 
Way k-eSe ete 56. 46 58. 33 —]. 87 
SUMG nas tees stiacise 58. 35 60. 27 | —1. 92 
BR ete Seco mere eas 58. 88 58. 78 | +0. 10 
AUS US bees: Sree 59. 23 58. 00 +1. 23 
September. ....--. 59. 68 58. 86 | +0. 82 
October. =o. os. s5,-- 57. 83 A7. 30 +0. 53 
November ..-..---. 54. 66 52. 40 2. 26% 
December ......-. 51, 94 48, 58 +3. 35 
| 
The data contained in the above table are represented graphically 
in the following diagram: 
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Geese Fe 
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Prof. Davidson says: “The lowest temperature of the water is for 
the month of January, 50.499; and the highest for the month of Sep- 
tember, 59.68° F.,” and he adds that “the temperature of the air follows 
very closely that of the water.” 
Hourly water temperatures taken by the Albatross at the foot of Mar- 
ket street and at the Union Iron Works, San Francisco, for limited 
periods, indicate a slightly higher temperature than in the Golden 
Gate, as may be seen from a study of the accompanying table. Tem- 
peratures taken by the same vessel at Mare Island, where the water is 
more subject to the influence of the Sacramento River, show a much 
lower temperature. 
