Recent  British  Weather. 
415 
I will  first  take  the  mean  temperatures  of  recent  summer 
months.  The  mean  temperature  of  the  air  at  9 A.M.  daily  is 
very  nearly  the  same  as  the  mean  of  the  extremes,  or  as  the  mean 
of  any  number  of  equidistant  observations.  The  following  are 
the  values  for  Camden  Square : — 
Months. 
June. 
July. 
August. 
Summer. 
Average  1859-78  
O 
61-7 
o 
64-9 
o 
63  4 
63°  3 
Maximum  ..  . . jye.fr 06 
66-0 
70-4 
67-4 
67-4 
1868 
1868 
1871 
1868 
Minimum  ..  . . j year  66 
57-1 
59-2 
59-4 
58-8 
1860 
1879 
1860 
1860 
A little  additional  evidence  is  afforded  by  these  figures,  but 
the  following  table  puts  the  matter  much  more  strongly. 
Table  III. — Difference  of  Mean  Temperature  at  9 a.m.  in  each 
of  the  Summer  Months  of  the  last  Ten  Years  from  the  Average 
of  the  Twenty  Years  1859-78. 
Year. 
June. 
[ July. 
August. 
Summer. 
O 
o 
o 
o 
1873 
— 3 
+ -3 
+ -3 
+ 1 
1874 
- 11 
+ 1-8 
- 11 
- 1 
1875 
+ '3 
- 3-6 
+ 1-0 
- -8 
1876 
- -6 
+ 2'5 
1-  1-4 
4-  11 
1877 
+ 2-8 
- 1-5 
+ 14 
+ '9 
1878 
+ 11 
+ ‘6 
+ '7 
+ ‘8 
1879 
- 3-0 
- 5-7 
- 1-7 
- 3-5 
1880 
- 2-8 
- 2-2 
0-0 
- 1-7 
1881 
- 1 
+ 16 
- 32 
- -6 
1882 
- 2-6 
- 33 
- 2-3 
- 2-7 
Mean 
- -6 
- 10 
- 3 
- -6 
This  shows  that  while  the  decrease  of  the  mean  temperature 
of  the  year  during  the  last  decade  (as  shown  by  Table  II.)  was 
merely  about  0o,2,  or  practically  nil,  the  falling  off  in  June 
was  more  than  half  a degree,  and  in  July  amounted  to  lo,0,  which, 
as  already  remarked,  is  equivalent  to  moving  the  country  100 
miles  further  north,  or  raising  it  300  feet. 
It  may,  moreover,  be  mentioned  that  out  of  the  24  Junes, 
1859-82,  there  were  10  below  61°-2,  and  of  these  5 occurred  in 
the  last  10  years. 
Of  the  corresponding  24  Julys,  10  were  below  630,5,  and  of 
these  5 occurred  in  the  last  10  years. 
Of  the  corresponding  24  Augusts,  10  were  below  63O-0,  of  these 
4 occurred  in  the  last  10  years. 
