THE ROYAL SOCIETY, AND AT THE ROYAL OBSERVATORY, GREENV/ICH. 589 
Table XXI. — Showing the mean temperature in quarterly periods, for the year, and 
the same for successive groups of years, at the Royal Observatory, Greenwich, from 
the year 1/71 to 1849. 
Year. 
January, 
February^ 
March. 
Group of 
years. 
April, 
May, 
June. 
Group of 
years. 
July, 
August, 
September. 
Group of 
years. 
October, 
November, 
j December. 
Group of 
years. 
For the 
year. 
Group of 
years. 
1771. 
32-7 
o 
49-1 
56-6 
43-2 
“N 
45-4 
_ o 
1772. 
35-0 
50-1 
58-2 
45-1 
47-1 
1773. 
37-6 
49*1 
57-7 
41-9 
46-6 
1774. 
37-4 
52-7 
58-9 
>59-6 
41-7 
47*7 
1775. 
41-3 
U7-6 
55"5 
>.52-0 
60*7 
42-6 
j>43-6 
50-0 
>48-2 
1776. 
36-9 
52*2 
59*3 
44-8 
48-3 
1777. 
38-1 
50-9 
60-3 
43-6 
48-2 
1778. 
36-8 
54-3 
6l-3 
44-5 
49-2 
1779. 
42-4 
J 
54-5 
63-2 
44-7 
51-2 
1780. 
37-7 
■s 
52-9 
62-7 
42-0 
48-8 
1781. 
39-7 
53-9 
61-7 
43-7 
49*8 
1782. 
37*3 
48-9 
57-1 
38-7 
45-5 
1783. 
37-9 
51-3 
60-3 
42*2 
48-0 
1784. 
1785. 
32- 4 
33- 5 
>36-8 
51- 7 
52- 7 
[>52'0 
57- 7 
58- 8 
>59-0 
38-3 
40-8 
>41-0 
45-1 
46'5 
>47*2 
1786. 
35-4 
52*2 
56-4 
39-1 
45-8 
1787. 
39-7 
51-2 
59-0 
42-6 
48-1 
1788. 
38-2 
54-8 
58-8 
39-6 
47*9 
1789. 
35-9 
50-7 
57-9 
J 
42-4 
J 
46-7 
1790. 
41-0 ■ 
50*1 
57'6 
■N 
43-5 
48-1 
1791. 
40-2 
51*9 
59-2 
40-9 
48-1 
1792. 
38-1 
51-0 
58-7 
44-0 
48-0 
1793. 
38-1 
49-5 
58-9 
45-3 
47-9 
1794. 
1795. 
40-8 
32-2 
^38-3 
52-6 
50-2 
>5M 
59-5 
60*2 
>58-9 
42-8 
46-3 
>42-7 
48-9 
47*2 
>47-8 
1796. 
41-3 
51-5 
59-2 
39-1 
47-8 
1797. 
36-3 
50*3 
59-0 
43-2 
47-2 
1798. 
38-8 
54-7 
59-7 
41-2 
48-6 
1799. 
35-6 
48-9 
57-2 
41-0 
J 
45-7 
1800. 
36-2 ' 
52-5 ■ 
61-6 ■ 
42*8 ■ 
48-3 
1801. 
40-7 
52*5 
60*6 
42-4 
49-0 
1802. 
37-7 
52-1 
59-4 
42*6 
48-0 
1803. 
37-3 
51-4 
59*3 
44-7 
48-2 
1804. 
1805. 
40-4 
38-4 
>38-7 
53-9 
49-9 
>52-1 
59- 8 
60- 0 
>60*0 
43-7 
42-3 
S>43-5 
49-5 
47-7 
>48*5 
1806. 
40-9 
52-6 
59-9 
48-5 
50*5 
1807. 
37-9 
52-6 
60-1 
42-8 
48-3 
1808. 
36-8 
52*5 
61-2 
42-0 
48-1 
1809. 
40-7 
51-4 
58-2 
j 
43-4 
48-0 
1810. 
38-4 - 
51-5 ~ 
60-3 ' 
44-4 ' 
48-7 ' 
1811. 
38-8 
54-2 
59-1 
46*4 
49-6 
1812. 
38-6 
48-9 
56-8 
41-5 
46*5 
1813. 
39-7 
50-5 
57-2 
41*4 
47-2 
1 
1814. 
32-0 
>38-5 
50*0 
>51*3 
58-2 
>59-1 
43-0 
>43-3 
43-8 
J>48-1 
1815. 
39-4 
53-1 
60-9 
42-4 
49*0 
1816. 
37-5 
48-4 
57-1 
42*6 
46-4 
1817. 
4M 
50-3 
56-2 
43-0 
47-7 
1818. 
38*7 
53-7 
63-5 
47-2 
50-8 
1819. 
41-4 
52-9 
61-2 
41-8 
49-3 
