582 MR. GLAISHER ON THE THERMOMETRICAL OBSERVATIONS TAKEN AT 
By taking- the means of the numbers in each column, we find that 
The mean temperature of March from all the observations is 
The mean temperature of April from all the observations is. 
The mean temperature of May from all the observations is . 
The mean temperature of June from all the observations is . 
The mean temperature of July from all the observations is . 
The mean temperature of August from all the observations is 
s . 
. 3.5-7 
is . 
. 38-2 
. 
. 40-9 
. 
. 45’7 
. 
. 52-6 
. 58-0 
. 
. 61-3 
• 
. 60-5 
5 is . 
. 56-3 
. 49-3 
i is . 
. 42-4 
5 is . 
. 38-8 
And the mean of all the monthly results is 48°*3. 
Table XVIII. — Showing the Highest and Lowest monthly mean temperature in 
every year from 1771 to 1849, with the amount of difference of temperature. 
1 Year. 
Monthly mean 
temperature. 
Difference 
between 
the hottest 
Alonth of temperature. 
Year. 
Blonthly mean 
temperature. 
Difference 
between 
the hottest 
Month of temperature. 
highest. 
Lowest. 
and coldest 
months. 
Highest, 
Lowest. 
Highest. 
Lowest. 
and coldest 
months. 
Highest. 
Lowest. 
1771. 
59-5 
29-9 
29-6 
July. 
January. 
1811. 
61-0 
32-8 
28-2 
July. 
January. 
1772. 
600 
32-2 
27-8 
July. 
January. 
1812. 
57-4 
35T 
22-3 
July. 
December. 
1773. 
60-9 
34-9 
26-0 
August. 
February. 
1813. 
58-9 
34-4 
24-5 
July. 
Januan^ 
1774. 
62-4 
31-5 
30-3 
August. 
January. 
1814. 
61-1 
26-9 
34-2 
July. 
January^ 
1775. 
630 
39-3 
23-7 
July. 
December. 
1815. 
62-3 
31-9 
30-4 
September. 
January. 
1776. 
62-8 
270 
35-8 
July. 
January. 
1816. 
58-9 
36-6 
22-3 
September. 
February. 
1777. 
62-4 
33-9 
28-5 
August. 
January. 
1817. 
591 
371 
220 
June. 
December. 
1778. 
670 
34-8 
32-2 
July. 
January. 
1818. 
66-2 
35-8 
30-4 
July. 
February. 
1779. 
64-9 
34-8 
30-1 
July. 
J anuarv. 
1819. 
63-8 
37-0 
26-8 
August. 
December. 
1780. 
65-7 
28-6 
371 
August. 
January. 
1820. 
59-5 
31-7 
27-8 
July. 
January. 
1781. 
65-3 
36-2 
291 
July. 
January. 
1821. 
61-7 
36-0 
25-7 
August. 
February. 
1782. 
59-2 
34-4 
24-8 
July. 
February. 
1822. 
62-6 
364 
26-2 
June. 
December. 
1783. 
65-7 
35-0 
30-7 
July. 
December. 
1823. 
59-8 
3D8 
28-0 
August. 
January. 
1784. 
59-5 
29-2 
30-3 
July. 
January. 
1824. 
62-5 
36-2 
26-3 
July. 
February. 
1785. 
62-2 
30-4 
31-8 
July. 
February. 
1825. 
05 '2 
38-1 
271 
July. 
February. 
1786. 
59-6 
35-9 
23-7 
June. 
Jan. and Dec. 
1826. 
65-6 
320 
33-6 
July. 
January. 
1787. 
61-4 
36-7 
24-7 
July. 
January. 
1827. 
03’5 
31-6 
31-9 
July. 
February. 
1788. 
60-6 
290 
31-6 
July. 
December. 
1828. 
61-9 
39-8 
22-1 
July. 
January. 
1789. 
60-2 
33-4 
26-8 
August. 
January. 
1829. 
601 
31-7 
28-4 
July. 
January. 
1790. 
59-9 
38-6 
21-3 
August. 
January. 
1830. 
630 
30-7 
32-3 
July. 
January. 
1791. 
61-4 
34-8 
26-6 
August. 
December. 
1831. 
64-3 
34-4 
29-9 
July. 
January. 
1792. 
62-2 
34-9 
27-3 
August. 
January. 
1832. 
61-2 
36-9 
24-3 
July. 
February. 
1793. 
64-9 
35-3 
29-6 
July. 
January. 
1833. 
611 
34-5 
26-6 
July. 
January. 
1794. 
65 '3 
33-3 
320 
July. 
January. 
1834. 
64-1 
40-2 
23-9 
July. 
February. 
1795. 
60-8 
23-9 
36-9 
Aug. and Sept. 
January. 
1835. 
64-4 
34-9 
29-5 
July. 
December. 
1796. 
59-9 
30-4 
29-5 
August. 
December. 
1836. 
62-9 
36-9 
26-0 
July. 
February. 
1797. 
63-3 
35-4 
27-9 
July. 
January. 
1837. 
61 -3 
35-8 
25 5 
July. 
March. 
1798. 
61-5 
33-7 
27-8 
August. 
December. 
1838. 
60-5 
28-9 
31-6 
July. 
January. 
1799. 
59-8 
32-8 
27-0 
July. 
December. 
1839. 
60-2 
37-2 
23-0 
July. 
January. 
1800. 
63-7 
34-1 
29-6 
August. 
February. 
1840. 
62- 1 
33-3 
28-8 
August. 
December. 
1801. 
62-5 
361 
26-4 
August. 
December. 
1841. 
60-5 
33-6 
26-9 
August. 
January. 
1802. 
64 8 
32-9 
31-9 
August. 
January. 
1842. 
65-4 
32-9 
32-5 
August. 
January. 
1803. 
63 7 
33-4 
30-3 
July. 
January. 
1843. 
62- 1 
360 
261 
August. 
February'. 
1804. 
60-2 
35-6 
24-6 
July. 
December. 
1844. 
61-4 
330 
28-4 
July. 
December. 
1805. 
61-7 
34-5 
27-2 
August. 
January. 
1845. 
60-7 
32-7 
28-0 
June. 
February. 
1806. 
61-4 
40-6 
20-8 
August. 
January. 
1846. 
65-3 
32-9 
32-4 
June. 
December. 
1807. 
63-7 
36-6 
27-1 
August. 
December. 
1847. 
05 ‘4 
35-1 
30-3 
J Lily. 
January. 
1808. 
65-7 
360 
29-7 
July. 
December. 
1848. 
61-5 
34-6 
26 9 
July. 
January. 
1 1809. 
1 1810. 
59- 0 
60- 9 
35-4 
34-4 
24-2 
26-5 
July. 
July. 
January. 
January. 
1849. 
62-9 
391 
23-8 
August. 
December. 
