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ad 
H. Gibbons on the Climate of San Francisco for 1855. 309 
57°; coldest noon 64°. Proportion of clear sky 77 per cent, of 
cloudy 23. Whole days clear sixteen, cloudy 0. Mist on three 
mornings and four evenings. No rain. On twenty-four days the 
afternoon was windy, and on three of these the wind was high. 
Wind SE and S three days, West twenty-eight days. Propor- 
tion of sea winds 100 per cent—that is to say the wind did not 
blow from the land for a single hour during the month. On the 
night of the 18th there was distant lightning, and on the 19th 
tain fell in Sierra county. The temperature was slightly above 
the mean of August for a series of years, At sunrise the mercury 
ranged between 54° and 57°, with a solitary exception when it 
stood at 53°. At noon the range was usually between 66° and 
74°, On sixteen days the temperature at noon was at or above 
70°, which can seldom be said of any month of the year at San 
Francisco. On the last day of the month was a slight frost in 
favorable situations, enough in some places to injure the tender 
vegetables. 
_ Barometric means for August: at sunrise 29-727 in., at 9 a. m. 
29740, at noon 29-739, at 10 p. m. 29:728. Extremes 29°90 
and 29.56. 
September.—Mean temperature sunrise 54°-97, 9 a. m. 62°°50, 
hoon 69°-9)), 10 p. mw. 579-04. Mean of extremes 62°°43. Maxi- 
mum 84°, minimum 650°; range 34°. Warmest morning 619, 
coldest noon 63°. Proportion of clear sky 80 per cent, of cloudy 
Whole days clear twelve, cloudy 0. No rain. Mist on 
seven mornings and nine evenings. Wind S and SE three days, 
SW two days, West twenty-four days, NW one day. Proportion 
of land winds 3 per cent, of sea winds 97 per cent. ‘There were 
twelve windy afternoons, on five of which the wind was high. 
It is unusual to have high sea winds so late in the season. 
Tange of temperature at sunrise was generally from 53° to 58°, 
and at noon from 64° to 78°, though ou three days it rose above 
There is usually some rain in September, but uone fell in 
the present month. In Oregon the first rain of the season was 
on the 3d, and heavy rains fell in the northern counties of Cali- 
fornia on the 16th and 17th. On the evening of the latter day, 
es ning was observed from San Francisco in the northern 
horizon. 
Barometric means for September: sunrise 29-718 in., 9 a. m. 
29-734, noon 29-727, 10 p. vA 29-677. Extremes 29°85 and 29:60. 
ober.—Mean temperature at sunrise 54°°77, at 9 a. M. 619-14, 
at noon 68°-32, at 10 p.m. 579-00. Mean of extremes 6 19°55. 
imum 79°, minimum 51°; range 28°. Warmest morning 
58°, coldest noon 61°. Proportion of clear sky 68 per cent, of 
cloudy 32; whole days clear ten, cloudy two. No rain. Mist 
on ten mornings, and seven evenings. Wind SE and § five days, 
SW one day, West twenty-four days, NW one day. Proportion 
a 
