THE ROYAL SOCIETY, AND AT THE ROYAL OBSERVATORY, GREENWICH. 603 
From the particulars in this Table, it seems that the highest reading of the ther- 
mometer within the year has occurred three times in May, seventeen times in June, 
twenty-four times in July, ten times in August, and three times in September, 
The lowest reading of the thermometer in the year has occurred twenty-eight 
times in January, nine times in February, once in March, once in November, and 
fourteen times in December. 
Table XXVIII. — Showing the highest and lowest temperature during the period in 
each month. 
Month. 
At the Apartments of the Royal Society. 
At the Royal Observatory, Greenwich. 
The lowest 
reading of 
the thermo- 
meter. 
The highest 
reading of 
the thermo- 
meter. 
Difference 
of readings. 
Mean of all the 
The lowest 
reading of 
the thermo- 
meter. 
The highest 
reading of 
the thermo- 
meter. 
Difference 
of readings. 
Mean of all the 
Lowest 
readings. 
Highest 
readings. 
Lowest 
readings. 
Highest 
readings. 
January ... 
February... 
March 
April 
May 
June 
July 
August . . . 
September 
October ... 
November 
December 
0 
7-0 
17-7 
23-0 
27-0 
31-0 
40-0 
44- 5 
45- 4 
37*0 
30-0 
23*8 
4-0 
57*7 
61-0 
66-0 
77-0 
84-0 
87-5 
93-5 
89-0 
83-0 
75-0 
63-0 
58-0 
50-7 
43-3 
43-0 
50-0 
53*0 
47-5 
49-0 
43-6 
46-0 
45-0 
39-2 
54-0 
22-6 
26-1 
29*2 
32-8 
39-3 
45-5 
49-3 
49-4 
42-9 
35-5 
30-4 
25-9 
51*0 
53-7 
58-5 
66-5 
73-8 
79- 5 
80- 5 
79-3 
73-6 
65-2 
57-4 
53-6 
O 
4*0 
7-7 
13-1 
27-0 
33-5 
38-6 
42-2 
42-0 
32-0 
28-3 
22*2 
16-4 
57-0 
62-3 
71-5 
76-5 
86-2 
87-6 
93*3 
92-0 
86-4 
74-0 
66*3 
62-8 
5.3-0 
54-6 
58-4 
49-5 
52-7 
49- 0 
5M 
50- 0 
54-4 
45- 7 
44-1 
46- 4 
20-2 
19-9 
24-6 
29-8 
36-4 
42-5 
45-5 
44-3 
36-3 
,31-4 
26-0 
23-5 
52-9 
54- 3 
62-7 
70-3 
77- 9 
83-0 
85-2 
82-6 
78- 2 
68-4 
59-6 
55- 5 
The lowest reading, as observed at the Apartments of the Royal Society, was 4 ° ; it 
occurred in the night of December 24, 1796 (at this time the reading in the environs 
of London was— 6°). The highest reading was 89°; the difference of these readings 
is 85°. 
The lowest reading, as observed at the Royal Observatory within the years 1841 to 
1849, was 4°, and the highest was 93°'3 ; the difference of these readings is 89°'3. 
4 H 2 
