THE ROYAL SOCIETY, AND AT THE ROYAL OBSERVATORY, GREENWICH. 581 
Table XVII. — Showing the mean temperature of eacli month at the Royal Obser- 
vatory, Greenwich, as found from the numbers in Table 1. of rny former paper till 
the year 1840, and from the observations at Greenwich from the year 1841. 
Year. 
January. 
February. 
March. 
April. 
May. 
June. 
July. 
August. 
September 
October. 
November. 
De<?ember. 
1771. 
29-9 
33'4 
34-7 
38-7 
o 
54'5 
540 
59-5 
58-4 
520 
4^2 
46-9 
41-4 
1772. 
32-2 
34-2 
38-5 
42-2 
48-6 
59-4 
600 
59-7 
55-0 
52-4 
43-4 
39-5 
1773. 
36-9 
34-9 
40-9 
44-2 
47-5 
55-6 
58 5 
609 
53-8 
48-2 
39-2 
38-2 
1771. 
31-5 
380 
42-8 
46-8 
511 
60-1 
61-8 
62-4 
54-7 
48-8 
39-2 
371 
1775. 
40-4 
41-9 
41-7 
49-7 
541 
62-6 
63-0 
60-8 
58-4 
48-2 
40-2 
39-3 
1776. 
270 
400 
43-7 
47-2 
50-6 
58-7 
62-8 
60-7 
54-5 
51-5 
42-7 
40- 1 
1777. 
33-9 
35-8 
44-6 
44-0 
52-3 
56-3 
60-5 
62-4 
58-1 
51-3 
43-7 
35-8 
1778. 
34-8 
35-6 
40- 1 
46-9 
54-8 
61-3 
67-0 
63 5 
53-4 
46-0 
44-7 
42-8 
1779. 
34-8 
45-3 
470 
50-7 
54-7 
58-0 
64-9 
63-9 
60 7 
51-9 
41-9 
40-2 
1780. 
28-6 
35-3 
49-2 
43-6 
561 
59-1 
63-2 
65-7 
59-3 
500 
39-5 
36‘6 
1781. 
36-2 
40-3 
42-6 
46-1 
531 
62-5 
65-3 
63 0 
56-8 
48-5 
41-7 
410 
1782. 
38-9 
34-4 
38-7 
40-7 
48-1 
57-9 
59-2 
56-7 
55-5 
45-2 
34-7 
36-2 
1783. 
36-9 
39-2 
37-7 
47-9 
48-3 
58-4 
65-7 
60 7 
54-6 
490 
42'5 
35 0 
1784. 
29-2 
31-9 
36-2 
42-0 
56-8 
56-2 
59-5 
56-2 
57-3 
43-9 
40-7 
310 
1785. 
361 
30-4 
33-9 
46-2 
52-5 
59-4 
62-2 
57-5 
56-8 
46-9 
40-2 
35-2 
1786. 
35-9 
36-2 
34-2 
44-7 
52-3 
59-6 
59-0 
58-9 
51-3 
44-7 
36-7 
35-9 
1787. 
36-7 
39-5 
42-8 
44-4 
51 3 
57-8 
61-4 
611 
54'4 
48-6 
39-6 
39-6 
1788. 
37-4 
38-7 
386 
49-5 
56-3 
58-6 
60-0 
59-9 
55-9 
49-1 
40-6 
29-0 
1789. 
33-4 
39-9 
34-4 
44- 1 
53-2 
54-8 
58-8 
60-2 
54-6 
46-8 
38-7 
41-6 
1790. 
38-6 
41-2 
43-2 
409 
52-6 
56-8 
591 
59-9 
53-9 
49-5 
42-0 
390 
1791. 
39-8 
38-8 
421 
48-8 
49-4 
57-6 
59-5 
61-4 
56-8 
46-6 
413 
34-8 
1792. 
34-9 
37-4 
42-1 
48-9 
49-6 
54-4 
58-6 
62-2 
65-4 
48-7 
43-2 
400 
1793. 
35-3 
39-7 
39-3 
42-4 
50-7 
55-4 
64-9 
59 0 
52-8 
' 51'9 
42-9 
410 
1794. 
33-3 
44-7 
44-3 
49-6 
50-6 
57'6 
65-3 
59-4 
53-7 
48-3 
43-3 
36-8 
1795. 
23-9 
341 
38-6 
45-1 
519 
53-7 
58-9 
60-8 
60-8 
53-4 
40-7 
44-8 
1796. 
45-3 
39-6 
390 
48-3 
501 
56-1 
58-6 
59-9 
591 
46-5 
403 
30-4 
1797. 
35-4 
65‘6 
37-9 
44-7 
51-3 
54-8 
63-3 
590 
54-6 
47'0 
41-4 
41-2 
1798. 
37-8 
37-9 
40-7 
49-2 
53-6 
61-2 
61-2 • 
61-5 
56-5 
49-8 
40-0 
33-7 
1799. 
33-3 
364 
37-2 
41'5 
49-5 
55-6 
59-8 
57-5 
54-3 
47-3 
42-9 
32-8 
1800. 
36-9 
34- 1 
37-5 
48-4 
540 
551 
63-2 
63-7 
57-9 
47-9 
422 
38-2 
1801. 
39-5 
38-5 
44-1 
45-4 
53 6 
58-4 
60-5 
62-5 
58-7 
50-9 
40-2 
361 
1802. 
32-9 
38-9 
41-2 
48-5 
50-2 
57-6 
56-5 
64-8 
57 0 
49-5 
40-5 
37-8 
1803. 
33-4 
36-3 
42-3 
47-8 
501 
56-2 
63-7 
61-7 
52-4 
48-9 
41*9 
43-3 
1804. 
43-2 
36-9 
411 
43-7 
56-6 
61 3 
60-2 
59-9 
59-4 
51-4 
441 
35-6 
1805. 
34-5 
38-7 
420 
45-3 
49-6 
54-5 
591 
61-7 
59-3 
47-4 
39-9 
39-5 
1806. 
40-6 
41-5 
40-7 
43-0 
550 
59-8 
61-2 
61-4 
57-0 
51-2 
47-4 
46-8 
1807. 
36-7 
400 
370 
45-4 
550 
57-7 
63-5 
63-7 
53- 1 
530 
38-7 
36-6 
1808. 
370 
36-3 
371 
42-5 
571 
58-0 
65-7 
62-5 
55-3 
46- 1 
43-9 
36 0 
1809. 
35 '4 
44- 1 
42-6 
411 
55-7 
57'5 
59-6 
58-9 
561 
49-6 
39-5 
410 
1810. 
34-4 
38-6 
42-2 
46-4 
49-7 
5 S ’5 
60-9 
605 
59-4 
51-8 
42-8 
38-6 
1811. 
32-8 
401 
43-4 
48-7 
56-2 
57'6 
610 
58-5 
57-9 
55 ’5 
45-2 
38-6 
1812. 
35-9 
41-6 
38-4 
41-5 
51-2 
540 
57-4 
57-0 
55-9 
48-8 
40-6 
35-1 
1813. 
34-4 
41-6 
43- 1 
43-8 
52-3 
55-3 
58-9 
58-3 
.54-5 
47-3 
40-2 
36-6 
1814. 
26'9 
340 
351 
481 
486 
53-4 
611 
58-6 
54-9 
473 
40-7 
411 
1815. 
31-9 
41-2 
450 
46-6 
54-7 
58-0 
59-9 
60-4 
62-3 
51-4 
38-9 
370 
1816. 
36-7 
36-6 
39-2 
43-4 
48-8 
53- 1 
54-5 
57-9 
58-9 
50-8 
39-3 
37-8 
1817. 
39-2 
42-6 
41-6 
43-9 
47-9 
591 
57-7 
55-4 
55-5 
450 
46-9 
371 
1818. 
39-3 
35-8 
40-9 
45-6 
525 
62 9 
66-2 
636 
60-7 
53-7 
49-2 
38-8 
1819. 
40- 1 
400 
44-0 
48-2 
54-2 
56-4 
61-7 
63-8 
58-1 
47-5 
40-8 
37-0 
1820. 
31-7 
36-9 
41-3 
49-3 
520 
56-1 
59-5 
58-5 
54-4 
47-0 
41-4 
39-9 
1821. 
37-5 
360 
42-8 
50-4 
49-4 
541 
57-7 
61-7 
59-6 
50-3 
47-6 
44-3 
1822. 
39-8 
43-3 
473 
46-7 
55-8 
62-6 
62-5 
61-3 
560 
52-0 
48-2 
36-4 
1823. 
31-8 
381 
39-8 
42-8 
54 6 
55-4 
59-1 
59'8 
55-4 
47-6 
430 
39-9 
1824. 
37-4 
36-2 
39-5 
43-8 
48-5 
55-0 
62-5 
600 
57-7 
49-8 
46-2 
41-8 
1825. 
38-4 
38-1 
38-5 
48-7 
53-6 
58-9 
65 '2 
61-8 
59-9 
50-8 
41-2 
40-6 
1826. 
320 
42-2 
43-2 
490 
500 
62-9 
65-6 
63-4 
56-3 
52-4 
39-9 
41-8 
1827. 
33-4 
31 6 
431 
46-8 
52-7 
57-6 
63-5 
59-0 
56-9 
51-8 
41-5 
44- 1 
1828. 
39-8 
40-2 
435 
46-5 
54-3 
60 0 
61-9 
590 
57-5 
49-9 
44-3 
44-5 
1829. 
31-7 
38-4 
390 
43-7 
54-5 
59-0 
60- 1 
57-7 
53-2 
47-5 
39-3 
34-9 
1830. 
30-7 
34-2 
45-8 
48-3 
54-7 
55-3 
630 
58-2 
53'5 
50-9 
44-4 
34-9 
1831. 
34-4 
41 2 
43-9 
48-1 
52-8 
59-4 
64-3 
63-3 
56-4 
550 
44-3 
42-0 
1832. 
37-3 
36-9 
40-5 
47-2 
51-5 
59-2 
61-2 
61-0 
56-6 
51-2 
43-7 
42-4 
1833. 
34 ’5 
42-4 
37-6 
45-2 
59-4 
59-8 
6 M 
57-5 
53-5 
48-3 
43-5 
44-6 
18 i 54, 
44-4 
40-2 
440 
450 
56-9 
611 
64- 1 
62-3 
58-3 
505 
44- 1 
41 0 
1835. 
38’0 
41-2 
41-0 
46-4 
52-9 
60-0 
64-4 
63-3 
571 
48-0 
430 
34-9 
1836. 
37-2 
36-9 
43-7 
43-3 
52-8 
590 
62'9 
58-9 j 
53-4 
47-4 
41-5 
39 6 
1837. 
37-2 
4( t -3 
35-8 
391 
47-8 
58-1 
61-3 
60- 1 
550 
50-6 
411 
41-2 
28-9 
329 
41'5 
41-6 
50-7 
57-2 
60-5 
59-6 
54-4 
50-0 
40-8 
38-6 
1839. 
37-2 
39- 1 
39-0 
40-9 
49-9 
58-7 
60-2 
58-9 
55-6 
48-9 
44-7 
39-6 
1840. 
39-0 
381 
37-6 
47-8 
53-5 
59-5 
58-0 
62- 1 
541 
46-8 
43-4 
33-3 
1841. 
33-6 
35-3 
46-2 
47-0 
56-8 
56-4 
57-8 
60-5 
58-1 
48-8 
42-7 
40-5 
1842. 
32-9 
40-8 
44-9 
45-2 
53-2 
62-9 
60-2 
65-4 
56-4 
45-4 
42-8 
45-0 
1843. 
39-9 
36-0 
42-9 
471 
52-2 
56-3 
60-9 
621 
59-5 
48-0 
43-8 
43-9 
1844. 
39- 1 
35-2 
41-5 
51-7 
52-9 
60-7 
61-4 
57-7 
56-9 
49-5 
44-0 
330 
1845. 
38-3 
32-7 
35-2 
46'3 
49-4 
60-7 
59-8 
57-3 
536 
50-2 
45'8 
41-7 
184 f >. 
43-7 
43-9 
43-3 
471 
54-6 
65-3 
64-5 
63-2 
60- 1 
50-5 
460 
32-9 
1847. 
351 
35-4 
410 
45-3 
56 4 
58-0 
65 '4 
62- 1 
54-3 
52-9 
46-9 
42-8 
1848. 
34-6 
43-4 
43-8 
47-6 
59-7 
58-5 
61-5 
58-5 
55'8 
51-0 
43-8 
44-0 
1849. 
401 
43-2 
42-5 
43-2 
540 
57-9 
62-1 
62-9 
58'8 
5 M 
44- 1 
39-1 
