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Art. XXIL — Meteorological Ohsei'vations made at the RacL- 
diffe Observatory^ Oxford^ in the Years 1816, 1817, 1818, 
1819, 1820, 1821. Communicated by the Rev. A. Robert- 
son, F. R. S. Savilian Professor of Astronomy at Oxford. 
The following Table shews the mean degree of cold and 
heat for every month in the years 1816, 1817, 1818, 1819, 1820 
and 1821, at the Radcliffe Observatory, Oxford, Lat. 51° 45' 
39^.5. The degrees of cold and heat were ascertained by a 
thermometer of Six’s construction. 
1 
1816. 
1817. 
1818. 
1 1819. 
1820. 
1821. 1 
Month. 
[ Lowest 1 
1 Highest, 1 
Mean. 
w 
0) 
% 
o 
1 Highest. 
Mean. 
')-3 
CA 
CU 
c 
1 Highest, j 
Mean. 
1 Lowest. 
1 Highest, j 
i 
cu 
0 
J. 
1 Highest. 
1 
j Mean. 
S 
0 
1 Highest. 
Mean. 
January, 
34 
39 
36.5 
34 
44 
39 
37 
43 
40 
33 
'45 
39 
24 
36 
30 
33 
41 
37 1 
February, 
29 
42 
35.5 
38 
48 
43 
32 
40 
36 
34 
43 
38.5 
31 
41 
36 
i?9 
39 
-34 1 
March, 
33 
45 
39 
35 
49 
42- 
35 
46 
40.5 
38 
148 
43 
34 
47 
45.5 
36 
49 
42-1 } 
April, - 
35 
52 
43.5 
34 
■53 
43.5 
40 
51 
45.5 
41 
56 
48.5 
41 
58 
49.5 
42 
58 
50 j 
May, 
42 
59 
55.5 
40 
57 
48.5 
44 
61 
52.5 
46 
64 
55 
45 
64 
54.'5 
41 
60 
504 f 
June, ^ 
47; 
66 
56.5 
51 
70 
60.5 
54 
74 
64 
48 
68 
58 
50 
69 
59.5 
45 
63 
54 I 
July, - 
50 
67 
58'. 5 
51 
68 
59.5 
57 
77 
67 
54 
73 
63.5 
53 
71 
62 
51 
68 
August, 
49 
66 
57.5 
49 
66 
57.5 
51 
71 
61 
57 
74 
65.5 
52 
69 
60.5 
54 
72 
63 1 
September, 
47 
63 
55 
49 
65 
57 
50 
65 
57.5 
49 
66 
57.5 
45 
65 
55 
55 
67 
61 1 
October, 
45 
59 
52 
35 
50 
42.5 
48 
61 
54.5 
i43 
56 
49.5 
41 
53 
47 
44 
58 
51 1 
November, 
32 
44 
38 
41 
53 
47 
44 
55 
49.5 
34 
44 
39 
36 
46 
41 
43 
52 
474 I 
December, 
31 
42 
36.5 
32 
41 
36.5 
27 
40 
33.5 
29 
38 
33.5 
36 
42 
39 
39 
48 
434 
1 Ann. Mean, 
,47 
48.04 
50.12 
49.21 
48.29 
49.21 j 
Hence we have the Mean Temperature for six years as fol- 
lows : 
1816, 
47.0 
1817, 
48.04 
1818, 
50.12 
1819, 
49.21 
1820, ■ - 
48.2'9 
1821, 
49.21 
Mean of Six Years, 
48.645 
Mean Temperature, calculated fi-om Dr Brewster’s Formula, 
, T " 81| cos. Lat, - - - 50°. 44 
Difference between this formula and observation, 1“.80 
Mean Temperature according to Mayer’s formula, 52°. 15 
Difference between this formula and observation, 3°.51 
The difference between the observed and calculated mean tem- 
2 
A a 
