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11
This table shows that the average pressure of the atmosphere for the
year 1857, at a uniform temperature of 32° F, was equal to a column
of mercury, deprived of air and moisture, 29 949 inches in height.
The mean temperature of this year was 51.2°, which was considerably
in excess of the average, the mean dew point temperature was 41.7°,
the mean humidity of the air 79.1, saturation being 100; and
the total rain fall 24.01 inches. The highest temperature registered
during the year was 90.2°, and the lowest 20.2°, and the range
consequently 70.0°. The highest temperature was registered at the
end of June, and the lowest early in January. The extreme ranges
for the different quarters were 44.4° in the first, 54.2° in the second,
41.0° in the third, and only 37.6° in the fourth. The temperature for
the first quarter was about an average, that of the second was 1.8°
of the third 3.5°, and of the fourth 3.4° above the average of the last 43
years.
I remain,
Gentlemen,
Your obedient Servant,
JOHN W. TRIPE.
April 27/A.1857.
Totter, Machine Printer, Warwick Place Ringsland.