The Sun.
London, England, 1848-11-02 00:00:00

THE MEAN TEMPERATURE OP THE DEW POINT AT

GREENWICII

For the month of ApiiiWas—W4 deg. 6 min., which is
3 deg. 0 rain., 1 deg. 4 min., 0 deg. 2 min., 1 deg. 9 min.,
and 1 deg. 8 min. below those for the years 1841, 1842,
1845, 1846, and 1847 respectively; 1 deg. 7 min. and
()deg. 1 min. above those for the years 1843 and 1844
respectively, or it is 0 deg. 9 min. above the average of
those seven years.
For the month of August was 52 deg. S min., which
is 2 deg. 2 min., 6 deg. 1 rain., 5 deg. 0 min., 4 dug. 7
min., and 3 deg. 3 min. below those for the years 1841,
1842, 1843, 1846, and 1847 respectively, 0 deg. 5 min.
and 0 deg. 2 min. above those for the years 1844 and
1845, or it is 2 deg. 9 min. below the average for these
seven years.
For the month of September was 50 deg. 9 min.,
which is 2 deg. 8 min., 2 deg. 6 min., 4 dog. 0 min. 2
dog. 3 min., Ina 4 deg. 0 min. below those for the years
1841, 1842, 1843, 1844, and 1846 respectively, 1 deg. 2
min. above those of the years 1845 and 1847, or it is 1
deg. 9 min. below the average of those seven years.
The mean value for the quarter was 52 deg. 8 min.,
which is 1 deg. 3 min. below the average for the corres-
ponding period of the preceding seven years.
The mean weight of water in a cubic foot of air fir the
quarter was 4.5 grains, which: isi 0.2 less than the
average for the seven preceding years.
The additional weight of water required to saturate a
cubic foot of air was 1.1 grain. The average value for
the seven preccaling years was 1.0 grain.
The mean degree of humidity of the atmosphere for
July was 0.726, for August was 0.727, and for Septem-
ber was 0.795. The averages for the seven preceding
years were 0.780, 0.804, and 0.842 respectively. The
value for the quarter was 0.783, which is 0.024 less than
he average for these years.
The mean elastic force of vapour for the quarter was
0.411 inch, which is 0.026 less than the average for
these years.
The mean reading of the barometer at Greenwich for
July was 29.836 inches, for August was 29.732 inches,
and for September was 29,632 inches; these values are
0.041 inch above, 0,063 inch below, andL 0,021 inch
above, respectively, the averages for the seven preceding
years. The mean value for the quarter was 27.797
inches, which is of the same value as the average for the
seven preceding years.
The average weight of a cubic foot of air under the
average temperature, humidity, and pressure, was 527
grains; the average for the seven preceding years was
526 grains.

The rain fallen at Greenwich in July was 2.1 inches,
in August was 4.6 inches, and in September was 2.4
inches. The average amount for the seven preceding
years was 2.3 inches in July, 2.7 inches in August, and
2.2 inches in September. The amount fallen in the
quarter was 9.1 inches, which is 1.9 inches greater than
the average for the seven preceding years. The average
fall of rain during this quarter, as derived from the ob-
servations since the year 1815, is seven inches. In the
year 1824 the fall of rain in the quarter ending Sep-
tember 30 was 9 inches; in 1828 it was 12.5 inches; in
1829 it was 11 inches; and in 1839 it was 10.5
inches. The total amount of rain fallen this year till
Sept. 30, was 24.3 inches, in 1841 it was 21.2 inches, in
1842 it was 14.2 inches, in 1843 it was 17.5 inches, in
1844 it was 16.2 inches, in 1845 it was 16.6 inches, in
1846 it was 17.5 inches, and in 1841 it was 11.6 inches;
so that the fall of rain this year exceeds that in 1841 by
2.7 inches, in 1842 by 9.7 inches, in 1843 by 6.4 inches,
in 1844 by 7.7 inches, in 1845 by 7.3 inches, in 1846 by
6.4 inches, and in 1847 by 12.3 inches. The excess of
the fall of rain this year over the average for the seven
preceding years is 7.5 inches.
In the years 1824 and 1828 the depth of rain fallen to
the end of September exceeded 23 inches; and in the
years 1829 and 1839 the amount collected exceeded 20
inches. So large a fall as 24.3 inches within the first
nine months of the year has probably not been exceeded
within this century.
The temperature of the water of the Thames was 63
deg. 0 min. by day, and 62 deg. by night. The water,
on an average, was 3 deg. 9 min. warmer than the air.
The horizontal movement of the air was about 130
miles daily; during the period of time between July 19
and July 27, it amounted to 233 miles per day; from
July 31 to August 6, its average daily value was 240
miles, and on August 21 it exceeded 300 miles.
The highest and lowest readings of the thermometer
in air at the height of four feet above the ground, and
protected as much as possible from the effects of radiation
and rain, were 85 deg. 3 min. and 32 deg. 8 min.
The average daily ranges of the readings of the ther-
mometer in the air, at the height of four feet were 22
deg. 5 min. in July, 18 deg. 5 min. in August, and 20
deg. 9 min. in September. The average ranges for these
months, from the observations of the seven preceding
years, were 17 deg. 2 min., 17 deg. 1 min., and 16 deg.
2 min. respectively. _

In July- the readings of the thermometer on grass
were 29 deg. 5 min. on one night, between 32 deg. and
40 deg. on nine nights, between 40 deg. and 50 deg. on
twelve nights, and above 50 deg. on nine nights. In
August the lowest reading was 86 deg. ; and the readings
were below 40 deg. on four nights, between 40 deg. and
50 deg. on eighteen nights, and above 50 deg. on nine
nights. In September, the readings were below 32 deg.
on nine nights, and the lowest was 23 deg. ; they were
between 32 deg. and 40 (leg. on seven nights, between 40
deg. and 50 deg. on nine nights, and above 50 deg, on
four nights.
The observer, at Uckfield, says-" That there was a
severe white frost on the morning of August 10, with
ice on the brooks and low grounds."
The mean amount of cloud for July was 6.6, for Au-
gust was 7.6, and for September was 5.6. The average
values for the seven preceding years were 6.7, 6.3, and
6.0 respectively.
There were five exhibitions of the aurora borealis
during the quarter, which occurred on July 11, August
28, September 4,8, and 18.
Thunder storms at different parts of the country oc-
curred on July 14, 26, August 1,3, 4,5, 6,7, 8,9, 10,
11, 22, 23, 31, and September 5; and lightning, unac-
companied by thunder, was seen on July 24, August 23,
24, 25, September 22 and 25. The storms of July 14
were observed at Greenwich, Latimer Rectory, Car-
dinton, Saffron Walden, and Leicester. At Greenwich,
thunder clouds were observed first in the W. and N.W.
at Bh. 30w. P.M., and from this time till near midnight
the thunder followed the lightning at intervals varying
from 5 sec. to 40 sec., and lightning was visible during the
whole of the night. At Latimer the storm is described
as awtul, and of five hours' duration. On July 24 light-
ning was seen at Saffron Walden; on July 23 there was a
thunder storm at Leicester; on August 1, thunder was
and Empin
heard at Greenwich during the afternoon; on Aug. 3 and
4, at Saffron
Walden; en August 5, there were thunder
storms at Greenwich, Stone, Saffron Walden, Leicester,
Lei-
cester and at Exeter; on August 9, gham-near the last-mentioned place a tree
was struck hy the lightning. On A
Au-
gust 11, at Greenwich,
no lightning
were thunder storms Leicester;
9,tragtusGt
r6eeannwdi7cht,hbeuret
was seen;
betweenon August 10 at Stone; on 8
P.m., tho storm began in theE
at on August 8, at
of lightning were vivid, and then db
manyours ooff6thPe. .a
flashes
ds
preceded tho thunder by two