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19
The mean pressure of the air as indicated by the barometer,
has been smaller than in 1861, but higher than in 1860,
the variation between the two having been less than one tenth
of an inch. The barometer was higher during February and
December, the average for these months having been 29.964
inches, and lowest in March, when it was only 29.750 inches, so
that the variation in the monthly means did not much exceed
two tenths of an inch.
The highest temperature recorded during the year was 790.2
in the month of July, and the lowest 200.6 in the month of
January, so that the extreme range was 580.6. The mean of the
highest reading in each month of the year was only 670.9, that
of 1861 having been 690.l, and that of 1860, one of the healthiest
years ever known, was 640.3. The mean of the lowest reading
in each month was 320.7, that of 1861 having been 320.3, and of
1860, 300.8, so that whilst the extreme range was 580.6, the mean
of all the monthly ranges was 350.2, which was less than in 1861
but more than in 1860. The mean of the highest readings for
each day in the year was 570.5, and of the lowest 430.7, giving a
mean daily range of 130.8 against 160.2 in 1861, and 140.3 in
1860. The mean temperature of the air was 490,9 against 490.7
in 1861, and only 470.4 in 1860, and the mean due point temperature
was 440.4 against 430.8 in 1861, and 420.2 in 1860. The
rain fall was much above the average, having been 29.82 inches,
while in 1861 in was 21.22 inches, and in 1860, the most rainy
summer of late years, it was 33.10 inches.
The rainfall was greater in Hackney than in the adjoining
districts, but this was caused partly by two or three very heavy
storms of rain having occurred in Hackney, when only a small
amount fell in the adjacent districts. In October the large
quantity of 4.12 inches fell, of which nearly 1 inch was registered
during one day. In 1861, the enormous quantity of 5.30 inches