TABLE XII. Mean Temperature of every day in the month of December, as deduced from the observations taken on that day at the Gardens of the Royal Horticultural Society at Chiswick in the years 1826-1869; 
and extremes of Mean Temperature for every day within the some period. 
DECEMBER. 
3 
Lowest and Highest 1 
Mean- Daily Teupeiuture j 
2 
JoZ 
1826 
1827 
1828 
1829 
1830 
1831 
1832 
.833 
.834- 
.835 
1836 
1837 
838 
1839 
1840 
1841 
1842 
1843 
1844 
.84s 
1846 
1847 
1848 
1849 
1850 
1851 
1852 
.853 
1854 
1855 
1856 
1857 
1858 
1859 
i860 
1861 
1862 
'1863 
1864 
1865 
1866 
1867 
1868 
1869 
f 
Lowest 
Year 
Highest 
Year . 
1 
4?-3 
48-2 
383 
40-4 
410 
45-2 
50-9 
511 
48-7 
49-6 
4!-5 
388 
49-4 
34-6 
48-7 
48-0 
ao-i 
J -2 
3?-0 
45'2 
28-7 
43-1 
408 
37*8 
37-6 
33-7 
374 
41-5 
39-9 
395 
26-0 
48-4 
44-6 
35-7 
47-2 
39-0 
39-8 
40-8 
36-4 
43-2 
34-1 
48-1 
43-0 
300 
4i*5 
260 
1856 
s!-i 
1833 
2 h 
422 
464 
367 
418 
38-2 
44-8 
48-7 
45-2 
43-6 
43-3 
47-6 
33-4 
49*9 
37*6 
40-9 
489 
50-5 
379 
36-4 
44-7 
32-9 
44-8 
38-0 
46-3 
42-5 
35-5 
42-7 
31-9 
40-8 
38-6 
27-2 
50-6 
44*1 
32-4 
45-0 
33-8 
44-9 
43-4 
35-9 
41*7 
38-0 
28-4 
45-0 
31-1 
40-8 
272 
1856 
50-6 
18571 
23-4 
3 
399 
462 
466 
42-0 
368 
44-3 
43-7 
49-5 
46-4 
47-7 
51-8 
351 
46-2 
33-4 
32-9 
48-2 
46-6 
47'6 
36-2 
35-4. 
29-5 
51-6 
42-5. 
37'6 
39-8 
37*8 
43-5 
37-5 
46-1 
32-5 
31-2 
51-4 
41-8 
30-2 
44-3 
29-6 
43-9 
44-4 
47*1 
42-7 
47-4 
33-4 
469 
30-7 
41-4 
29-5 
1846 
51-8 
1836 ' 
22-3 
362 
500 
506 
44-5 
384 
495 
42-0 
52-6 
421 
410 
54-0 
30-2 
42-3 
33-7 
31-7 
45-1 
46-3 
46-9 
35-2 
40-2 
31-5 
46-2 
46-3 
33-7 
42-3 
37*7 
53-6 
39-2 
440 
42-0 
31-6 
43-0 
47-9 
40-7 
45-0 
34-3 
44-4 
42-9 
48-3 
43-4 
52-9 
31-2 
53-6 
32-1 
4 2 *3 
30-2 
1837 
64-0 
1836 
23-8 
5 
372 
507 
47-1 
459 
382 
45-7 
400 
44-4 
38-5 
41-5 
518 
370 
42-1 
37-9 
381 
46-3 
45-3 
49-5 
25*5 
45-0 
34-5 
41-6 
45-2 
37*3 
44-9 
44-2 
53-4 
40-7 
42-1 
37*7 
47-5 
39-4 
37-8 
44-9 
44-2 
33-7 
50-9 
46-9 
48-5 
45-7 
52-5 
37*0 
53-0 
34-7 
42-9 
25-5 
1844 
53-4 
1852 ; 
27-9 
6 
398 
41-7 
47-2 
36-1 
47-5 
48-7 
41-2 
41-8 
45-6 
38-8 
51-8 
340 
38-7 
35-2 
34-6 
46-8 
38-4 
431 
21-9 
37-7 
35*2 
47-2 
46-9 
42-7 
39-0 
47-2 
47’6 
41-5 
38-4 
35-3 
52-1 
49-0 
32-7 
41-2 
49-7 
40-7 
52-9 
43-9 
46-5 
49-4 
52-0 
34-1 
52-9 
372 
42-4 
21-9 
1844 
52-9 
1862} 
310 
49-0 
41-7 
48-7 
289 
460 
503 
39-7 
45-9 
49-5 
38-3 
47-3 
33-6 
41-1 
35-2 
37-0 
44-8 
370 
48-4 
27-9 
34-5 
37-6 
41-3 
51*6 
44-5 
38-0 
46-0 
467 
41-4 
33-9 
33-6 
56-7 
48-5 
34-0 
40-4 
48-6 
48-2 
53-9 
47-4 
47*5 
490 
49-7 
32-7 
49-6 
37-4 
42-8 
27-9 
1844 
56-7 
1856 
288 
8 
493 
42-9 
42-0 
340 
44-0 
530 
44-3 
460 
41*1 
39-4 
41-9 
34-9 
35-2 
33-4 
39-7 
49-4 
34-0 
45-1 
29-5 
37-7 
38-9 
36*1 
53-6 
42-0 
36-3 
45-4 
45-8 
36-2 
44-5 
29-2 
55-3 
40-9 
37-0 
40-4 
44-0 
46-0 
42-4 
45-9 
42-1 
47-0 
40-1 
31-3 
49-3 
40-1 
41 s 
292 
1855 
55-3 
1856 
26-1 
453 
383 
405 
308 
450 
500 
47-8 
52-2 
38-7 
36-7 
38-8 
36-0 
30-7 
34-2 
33-6 
40-8 
40-3 
389 
29-4 
40-7 
39-7 
53-8 
47'9 
35-7 
33-6 
46-0 
45-5 
43-7 
38-5 
28-7 
54-2 
44-9 
37*9 
42-0 
41-4 
47-6 
44-4 
46-9 
41-7 
44-9 
43-4 
23-1 
44-2 
40-3 
4°'9 
231 
1867 
54-2 
1856| 
31-1 
521 
510 
473 
32-4 
38-4 
508 
463 
42-8 
390 
27-7 
361 
37-4 
34-8 
37-0 
38-2 
47-4 
38-1 
43-6 
30-2 
39-4 
36-5 
52-4 
45-6 
37-7 
34-5 
51*2 
51-8 
36-8 
32-0 
34-8 
51-6 
43-6 
35-4 
38*2 
389 
46-6 
46-4 
43-4 
37-7 
42-0 
43-6 
32-3 
49-0 
41-5 
41-2 
27-7 
1835 
52-4 
1847: 
24-7 
503 
456 
47-7 
38-2 
37-0 
52-2 
41-0 
38-7 
34-7 
25-7 
34-0 
351 
39-9 
42-7 
35-3 
41-7 
40-8 
39-8 
26-7 
43-9 
29-4 
47-0 
500 
37*3 
40-7 
39-9 
52-7 
31-3 
34-2 
29-0 
47-0 
40-8 
35*5 
30*2 
39-6 
44-7 
42-4 
49-4 
47-3 
39-1 
35-7 
43-2 
48-9 
44-1 
40-2 
25-7 
1835 
52-7 
1852 
27-0 
12, 
501 
460 
468 
40-9 
34-4 
51-0 
40-8 
36-5 
38-2 
31-6 
44-2 
34-0 
41-4 
44-2 
35-6 
49-7 
53-5 
33-9 
27-6 
34-2 
29-7 
46-0 
51-3 
34-1 
42-5 
34-1 
49-0 
32-5 
37*3 
26-8 
46-8 
44-3 
35-5 
34-7 
40-1 
49-2 
37*0 
46-0 
43-0 
40*0 
50-1 
46-0 
37-4 
40-1 
40-6 
26-8 
1855 
53-5 
1842' 
26-7 
*3 
48-6 
398 
487 
397 
30-0 
48-5 
41-6 
391 
38-8 
331 
44-2 
361 
41-5 
41-8 
31-5 
470 
52-5 
38-3 
26-9 
30-8 
23-5 
44-5 
48-1 
33-8 
44-3 
41-0 
50-0 
41-3 
44-5 
25*8 
44-2 
40-8 
40-3 
32-0 
38-9 
47-5 
41-0 
45-0 
41-5 
37*8 
49-4 
42-0 
46-6 
47-2 
40-7 
23-5 
1846 
52-5 
1842 
290 
459 
42-5 
44-7 
31-1 
34-5 
44-0 
43-2 
46-8 
37-4 
36-9 
41-7 
361 
39-9 
44-0 
27-2 
37-6 
48-6 
41-5 
29-4 
40-0 
23-0 
45-6 
46-4 
48-8 
44-8 
39-4 
49-8 
37-7 
50-7 
38-0 
42-5 
42-8 
37-5 
27*3 
37*6 
46-0 
40-0 
42-5 
38-1 
39-4 
44-3 
47*7 
50-9 
42-6 
40-8 
23-0 
1846 
50*9 
18681 
27-9 
, 5 
453 
497 
467 
35-9 
36-5 
41-9 
40-7 
50-8 
41-1 
37-4 
37-0 
36-5 
35-7 
37-8 
230 
44-6 
47-9 
47-0 
368 
45-9 
23-1 
47-7 
49-7 
50-5 
46-8 
37-6 
48-1 
32-0 
49-4 
42-5 
34-4 
47*4 
37*3 
24-3 
35-8 
46-8 
37*0 
42-5 
34-3 
37*6 
43-2 
51-1 
51-0 
41-5 
4*’ 1 
23-0 
1840 
51-8 
1833 
288 
16 
46-7 
460 
49-6 
36-9 
30-7 
44-1 
361 
48-6 
43-0 
37‘9 
38-1 
40-6 
35-1 
37-9 
29-2 
40-0 
51*7 
46-4 
38-4 
47-0 
28-5 
49-6 
41-0 
51-9 
41-8 
41-3 
43-2 
26-1 
40-4 
37*1 
29-2 
49-2 
37*3 
23-4 
380 
46*8 
38-0 
41-0 
33-2 
39-3 
45-4 
50-8 
47-7 
44-9 
40-7 
23-4 
1859 
51-9 
1849 j 
28-5 
17 
44-4 
439 
51-5 
32-5 
34-5 
44-6 
47-8 
47-0 
42-8 
38-3 
41-0 
47-5 
34-6 
373 
24-8 
32-4 
44-3 
420 
39-8 
44-6 
33-8 
50-6 
40-0 
4/-0 
37-0 
40-1 
49-1 
28-9 
38-4 
37*7 
32-9 
51-8 
39-0 
21-3 
330 
42-8 
45*0 
44-0 
23-5 
41-5 
42-9 
48-7 
46*9 
42-5 
40*3 
21-3 
1859 
51-8 
1857 
30-5 
18 
41*6 
53-6 
50-5 
35-2 
34-3 
430 
38-9 
49-4 
38-4 
401 
48-7 
49-5 
34-3 
38-5 
30-2 
26-1 
40-4 
42-1 
41-6 
43-4 
27-4 
45-7 
44-8 
48-6 
35-6 
38-3 
40-9 
30-1 
36-6 
32-1 
42*2 
47*8 
43-3 
20-2 
27-4 
42-8 
41*5 
37*5 
27-5 
39-9 
48-3 
35-9 
50-0 
50-9 
39*9 
20-2 
1859 
53-6 
1827 i 
33-4 
j 19 
406 
512 
482 
1 330 
36-6 
39-7 
35-2 
50-8 
42-0 
33-6 
47-1 
48-4 
34-4 
50-7 
33-1 
27-8 
39-8 
44-0 
39-2 
41-3 
42-2 
44-6 
44-6 
40-3 
35-3 
! 47*5 
47*8 
31-8 
36*3 
25-4 
37*5 
34-4 
42-9 
20-3 
290 
38-5 
44-5 
43-0 
33-8 
42-5 
41-6 
33-9 
39-9 
45-5 
39*5 
20-3 
1859 
51-2 
1827, 
309 
20 
40-8 
440 
52-3 
320 
380 
41-8 
33-5 
43-6 
41-6 
31-8 
42-1 
48-7 
34-8 
51-0 
35-3 
29-6 
48-6 
43-9 
33-0 
39-5 
45*3 
37-4 
35-5 
36-3 
30-8 
49-8 
50-1 
35-0 
37*9 
24-5 
44-4 
39-0 
38-0 
25-4 
28-9 
39*1 
38-5 
39-5 
41-7 
46-5 
32-2 
29-4 
42-2 
41-0 
39*o 
24-5 
1855 
52-3 
18281 
27-8 
21 
395 
42-7 
526 
280 
399 
38-5 
42-7 
42-2 
41-9 
291 
42-3 
42-1 
34-9 
49-3 
341 
30-8 
51*2 
45-9 
33-5 
34-5 
43-7 
33-4 
28-1 
32-1 
31-6 
45-2 
43-3 
34-6 
39-5 
19-8 
44-7 
50-3 
48-6 
388 
31-1 
38-9 
37-5 
41-5 
40-3 
47*7 
35-2 
40-7 
49-4 
37*1 
39*3 
19-8 
1855 
52-6 
1828 
32-8 
352 
470 
52-5 
31-9 
420 
40-0 
49-0 
47-8 
35-5 
27-0 
43-0 
46-9 
38-6 
51-1 
29-5 
34-1 
500 
46-1 
31-8 
36-9 
36-1 
34-8 
31-0 
33-5 
32-0 
42-7 
44-2 
34-1 
51-0 
20-7 
43-7 
52-5 
45-4 
34-9 
29-1 
40-0 
37-5 
35-0 
33-4 
40-9 
383 
40-8 
47-5 
37*8 
39’4 
20-7 
1855 
52-5 
{1|28 
31-8 
*3 
47-8 
437 
48-3 
27-6 
31-5 
35-8 
48-4 
46-6 
32-4 
26-2 
38-8 
46-6 
44-0 
51-8 
24-8 
38-3 
41-9 
520 
31-1 
39-7 
36-4 
35-5 
27-4 
29-1 
31-3 
379 
43-0 
35-9 
37-8 
43-3 
35-8 
51-1 
45-9 
35-5 
22-9 
40-5 
40-5 
37-0 
30-4 
40-6 
41-8 
33-5 
41-3 
40-6 
38-5 
22-9 
1860 
52-0 
1843; 
291 j 
24 
460 
490 
472 
28-6 
18-9 
311 
46-9 
47-2 
335 
26-6 
31-3 
48-4 
41-8 
51-0 
31-3 
46-2 
37-5 
50-5 
32-7 
34-3 
320 
37-8 
32-4 
31-6 
32-3 
38-5 
51*9 
32-8 
41-3 
42*0 
35-6 
483 
40-9 
40-1 
22-9 
38-0 
450 
44-0 
32-2 
33-5 
41-2 
390 
44-5 
35-4 
3«'S 
18-9 
1830 
61-9 
1852; 
33-0 
as 
467 
490 
39-5 
291 
191 
29-7 
46-4 
379 
406 
22-5 
30-4 
47-7 
339 
41-2 
21-2 
38-7 
40-3 
460 
33-0 
39-5 
27-6 
38-5 
42-7 
33-2 
37-5 
34-7 
48-3 
28-1 
44-9 
42-8 
26-5 
43-2 
40-7 
39-6 
18-7 
32-5 
45-9 
40-9 
32-4 
39-9 
38-4 
35-4 
40-6 
31-9 
36-8 
18-7 
1860 
49-0 
1827 
30-31 
26 
420 
482 
353 
26-5 
27-5 
32-7 
38-3 
40-1 
38-4 
22-5 
31-1 
46-9 
34-6 
38-9 
27-8 
31-1 
49-0 
440 
35-0 
43-0 
28-9 
34-9 
46-6 
38-7 
41-0 
31-1 
50-7 
27-5 
39-2 
48-0 
30-4 
41-4 
44-2 
40-2 
25-0 
28-6 
47-4 
45-4 
33-9 
45-2 
44-9 
30-8 
45-2 
26-1 
37*5 
22-5 
1835 
50-7 
18521 
28 ' 2 j 
27 
433 
42-6 
38-0 
25-4 
30-9 
35-5 
356 
41-9 
363 
34-0 
30-2 
46-4 
35-5 
42-4 
30-7 
31-5 
39-0 
43-0 
33-3 
44-2 
31-1 
34-2 
44-2 
36-1 
40-8 
33-6 
49-0 
28-5 
34-4 
46-4 
25-9 
38-4 
40-6 
38-8 
300 
32-4 
43-4 
38-4 
32-2 
377 
44-4 
32-9 
48-5 
27*0 
37'o 
25-4 
1829 
49-0 
1852 
23-6 
28 
34-7 
34-5 
39-8 
25-9 
32-9 
39-3 
353 
438 
351 
41-7 
30-9 
47-5 
32-3 
35-2 
28-0 
40-5 
34-5 
451 
43-4 
41-1 
29*0 
33-6 
41-5 
23-7 
38-7 
38-0 
40-1 
27-2 
30-7 
47-9 
23-5 
35-2 
40-5 
43*7 
21*4 
361 
49-9 
35-4 
39-0 
44-3 
47*7 
31-5 
42-6 
23-5 
3 6 *5 
21-4 
1860 
49-9 
1862 
28'5 j 
29 
43-2 
32-3 
375 
26-4 
27-7 
390 
380 
50-8 
39-6 
38-7 
31-5 
46-9 
42-6 
30-9 
28-3 
42-0 
49-0 
41-9 
43-3 
39-7 
34-0 
34-3 
38-8 
29-2 
43-9 
37-9 
50-1 
22-5 
35-2 
46-6 
33*4 
39-7 
35'4 
48-2 
24-3 
280 
45-9 
44-9 
39-9 
47*2 
48-4 
35-1 
36*9 
32-8 
3 s-2 
22-5 
1853 
50-8 
1833 2 *' ! 
30 
474 
37*5 
39-9 
298 
39-6 
34-5 
35-7 
49-7 
51-6 
38-5 
29-5 
47-3 
46-8 
82-6 
31-5 
37-3 
51-6 
40-3 
37-5 
48-5 
31-8 
36-7 
36-1 
34-0 
46-4 
32*9 
48-5 
31-1 
35-8 
38-7 
41-5 
36-7 
37-7 
49-3 
37-7 
30-2 
44-9 
37*9 
368 
42-6 
379 
32-7 
37-0 
38-5 
39-1 
29-5 
1836 
51-6 
ll812 
22-1 
I 3i 
46-7 
40-6 
42-3 
30-0 
41-4 
32 ° 
35-7 
46-4 
50-9 
28-9 
29-7 
446 
35-8 
44-2 
40*3 
36-8 
43-3 
44-7 
38-5 
42-8 
24-2 
34-4 
36-4 
32-8 
50-5 
32-7 
46-2 
27*5 
41-0 
38-0 
47-3 
35-6 
41-4 
52-0 
37*5 
35-3 
41-9 
34-9 
33-8 
46-4 
28-5 
27-2 
37*2 
41-6 
38-6 
24-2 
1846 
52-0 
1859 
279 
| Means 
43-8 
447 
45-3 
33, 
35-9 
42-6 
41-8 
45-7 
40-9 
350 
40-3 
j 41*1 
388 
402 
| 32-5 
j 40-3 
44-6 
440 
33, 
40-5 
32-4 
42-4 
38-0 
39-2 
40-0 
47-2 
33-8 
39-9 
35-6 
39-4 
44-2 
40-0 
35-7 
35-4 
39-5 
43-5 
*,3 
38-1 
42*5 
430 
36-8 
45-8 
37-7 
4 °'° | 
The Mean Temperature of the coldest day in December in the years 1826 to 1869 was 18°*7, and it took place on the 25th day in the year 1860. I The day of the month whose Mean Temperature lias been subjected to the greatest difference was the 18th; in the year 1859 its Mean Temperatur^B 
The Mean Temperature of the hottest day in December in the years 1826 to 1869 was 56 0, 7, and it took place on the 7th day in the year 1856. 20 o, 2 ; and in the yeas' 1827 it was 53° - 6 ; the difference between these numbers is 33°'4. 
The difference between these numbers is 38°‘0, and it represents the extreme difference between the Mean Temperature of two days in the month of December The day of the month whose Mean Temperature has been subjected to the least difference was the 30th; in the year 1836 its Mean Temperature was 
in 44 years. I and in the year 1834 it was 51°-6, the difference between these numbers is 22°-l.* 
T * Also the 30th in the year 1812; Mean Temperature 51°-6; and in the year 1836 it was 29 0, 5 ; the difference between these numbers is 22°-l. 
