MEAN DAILY TEMPERATURE 
223 
Note. — Attention is called to the postponement of the visit 
to the Natural History Museum on December 9, so that 
members can attend the Autumn Meeting of the South-Eastern 
Union of Scientific Societies at the Guildhall on that day. 
VICISSITUDES OF MEAN DAILY TEMPERATURE 
THROUGHOUT THE YEAR, &C. 
By E. G. Aldridge, F.G.S., F.R. Met. Soc. 
(Continued from p. 209.) 
“Unsmoothed” Values. '‘.Smoothed” Values. 
Table XII. From Tables IX. and XI. 
December. 
The value of the ist and 2nd is 
39’5'. Warmth sets in on the 3rd, 
and continues till the 8th, the 
highest, lowest, and average of 
these six days being 42' 1° (6th), 
404° (3rd), and 4i‘2“. The 6th is 
the warmest day of the month. 
From the 9th to the I2th consti- 
tutes a colder period, with a mean 
of 39' I On the 13th the tempera- 
ture rises to 40'3°, and continues at 
40’0° or upwards for five days, with 
an average of 40'3‘’. There is a 
descent from 39'4° on the i8th to 
37'3° on Christmas Day, but the 
21st and 22nd each show a rise 
above the general fall of the period. 
From the 26th (38'3°) to the end 
the temperature varies only o'4 , 
and the average is 38‘4°. Christ- 
mas Day is the coldest day of the 
month, and is only o'3“ warmer 
than January 12. Range, 4‘8°. 
Mean, 39 ’ 39 °- 
General 
A temperature of 40° or upwards 
first happens on January 31, and 
occurs last on December 17. The 
first instance of 45° or upwards is 
on March 29 ; the last on Novem- 
ber 8. 50“ or up\vards is first met 
with on April 20 ; it does not occur 
after October 19. May 21 affords 
the first instance of 55“ or upwards, 
and October i the last. 60“ or up- 
wards is not found till June 13 ; it 
disappears from the table after 
The month opens with 40‘3°. A 
warmer period now commences, 
and there is a daily rise to 4i'o° on 
the 5th and 6th, which are Decem- 
bers mildest days. 40'8“ occurs on 
the 7th. The temperature now 
falls to 39'5 on the nth, after 
which the values increase to 40‘0 
on the 14th, 15th, and i6th, the 
middle day being fractionally the 
warmest. -A fall now takes place 
until 38 'o° is reached on the 24tl‘ 
and 25th (the coldest days). The 
remaining six days have nearly the 
same value, the average being 
3S'3°. The mild period near the 
commencement, and the cold 
weather of Christmas, are so well 
marked that the “smoothing” pro- 
cess has not been able to eliminate 
them. Range, 3'o°. 
Remarks. 
-A temperature of 40° or upwards 
first happens on February 16, and 
occurs last on December 16. The 
first instance of 45' or upwards is 
on March 30 ; the last on Novem- 
ber 7. 50° or upwards is encoun- 
tered on May i ; it does not occur 
after October 17. May 21 supplies 
the first instance of 55'^ or upwards, 
and September 30 the last. 60’ or 
upwards is not found till June 17 ; 
it disappears from the table after 
