MEAN DAILY TEMPERATURE 
207 
With the exception of the nth 
(62'5°), there is now an unbroken 
rise to the 15th, which is dis- 
tinguished as the hottest day of the 
whole year, its value being 65'2°. 
(On this date, in 1881, the maxi- 
mum temperature is 97" 1°). On 
th'e next day, however, the mean is 
only 64' 1°. The temperature may 
now be regarded as fairly steady at 
about 64 0^ (except a drop to 63'6° 
on the 19th, and a rise to 64' 7° on 
the 22nd) until the 24th, when a 
fall of 08’ takes place, and the 
values never again rise to 64'o° 
during the month, though they 
reach 63'8‘’ on the last two days. 
(The 22nd, in 1868, has a maximum 
of 96‘6°). The period from the 
23rd to the 26th is usually wet. 
Range, 4 2°. Mean, 63-57'’. 
These are the hottest days of the 
year. It is noteworthy that whereas 
in the “ unsmoothetl ” tables the 
difference between the means of 
these days is as much as ft'’, 
in the table containing the 
“ smoothed ” values there is prac- 
tically no difference at all. It will 
also be noticed that the mean of 
the hottest day is 09'’ less in the 
latter than in the former. The 17th 
is nearly as hot as the i6th and 
15th ; and then a steady fall begins, 
and continues till the 27th, when 
the value is 63-4“. The remaining 
days are slightly warmer. Range. 
20'’. 
A u trust. 
August I has the same tem- 
perature as that of July 31. On 
the 2nd and 3rd the mean is much 
lower, falling to 62-7° on the 3rd. 
A rise then takes place ; and the 
7th and 8th, with their average of 
64-3°, are nearly the warmest days 
of the month. The ne.xt four days 
are cooler ; on the loth the mean 
is but 63-5°. The hottest day of 
August is the i3ih, with a tempera- 
ture of 64-5°; but after this a con- 
siderable loss of heat takes place. 
[On the 13th, in 1876, the maxi- 
mum in London (Brixton) was 
about 96°]. The 14th and 15th, 
w'ith their mean of 63-7^ appear to 
delay for a time an important 
diminution ; but after these there is 
a tairly steady fall until the 23rd, 
whose temperature is 61 '6°. The 
26th, 27th, and 28th are warmer, 
and have an average of 62-3°. The 
last three days of the month have 
a mean of only 6i'2“. The 31st is 
the coldest day (60-9°). Range, 
3-6°. Mean, 62-91°. 
The month commences with a 
mean of 63 5°. The 2nd and 3rd 
are slightly cooler. 63-5° is re- 
sumed on the 4th, followed by a 
rise to 63-9°, which lasts from the 
8th to the iith (inclusive), the 8th 
being fractionally the hottest day 
of the month. If the figure in the 
second place of decimals be 
“ thrown up,” the temperature 
becomes 64-0°. On the 12th and 
13th the diminution of heat is but 
small. 63-7° occurs on the 14th, 
after which there is an almost con- 
tinuous descent to 61 -1° on the 
31st (the coldest day). Range, 
2-8°. 
September. 
During the first week the tem- 
perature oscillates between 61-1“ 
and 60-0°, the former happening on 
the 3rd, the latter on the 7th. The 
3rd is September’s hottest day. 
The mean of the 8th is 59"7° ; and 
60-0° is no more met with to the 
The average of the 1st is 60-9'’ ; 
that of the 30th is 55-2°. There is 
absolutely no check to the fall of 
temperature during the month. 
Range, 5-7“. 
