TABLE I. Mean Temperature of every day in the month of January, 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 same period. 
JANUARY. 
6826:1827 
1828 
1829 
1830 
.83. 
1832 
.833 
1834 
1835 
1836 
.837 
1838 
1839 
I 840 
.8+. 
18+2 
1843 
.8+4 
1845 
1846 
1847 
1848 
1849 
1850 
1851 
1852 
<853 
.s 5 4 
.855 
1856 
1857 
1858 
1859 
1 S60 
1861 
1862 
1863 
1864 
i86$ 
18 66 
1867 
1868 
1869 
i 
— 
Year 
Highest 
Year 
§111 
41-0 , 41-6 
43-5 
43*1 
32-3 
86* 
269 
36* 
40* 
43-3 
25-3 
26-3 
«1 
43* 
500 
40-6 
34-6 
33-8 
397 
366 
322 
35-5 
so. 
27-8 
624 
307 
60* 
26* 
471 
36-4 
4°8-4 
28*4 
37* 
37'S 
25-3 
1836 
52-4 
1851 
27-1 
87-5 34-7 
39-4 
38-0 
330 
370 
30-6 
44* 
36-6 
40-5 
23-4 
26-4 
44-6 
44-3 
457 
877 
33-1 
31-5 
28-8 
347 
80-8 
31-4 
427 
24-6 
83-3 
49-6 
36-6 
48-5 
22-9 
47-8 
43* 
42-7 
38-6 
347 
48-3 
27-2 
377 
48-5 
25-9 
27-9 
43-5 
19-9 
30-0 
43-1 
36z 
19* 
1867 
49-5 
1851 
29-6 
34-3 22-9 
41-3 
39-2 
35*0 
38-6 
29*4 
397 
47* 
34-3 
25-3 
35*8 
38-8 
45*0 
42-8 
32-3 
30* 
307 
287 
33-8 
33* 
32-5 
477 
273 
37-5 
44* 
39-6 
447 
257 
46-1 
44* 
44-5 
35* 
34-5 
49-7 
23* 
35-8 
40-9 
24* 
33-4 
44-3 
21-9 
29-0 
46-1 
36-2 
21* 
1867 
49-7 
1860 
278 
w-o 
36-3 407 
35-5 
36-8 
29-5 
351 
457 
82* 
46-8 
35-6 
371 
38* 
36 5 
407 
40-1 
33-7 
39-6 
434 
39-6 
47-4 
321 
43-1 
433 
387 
31-5 
38-6 
427 
29-6 
35-7 
42* 
26* 
427 
47-5 
10* 
297 
437 
37-0 
10* 
1867 
47-5 
1866 
366 
*K)' 29'2 
343 
347 
35-5 
35-6 
327 
32-5 
471 
327 
47*7 
87* 
321 
377 
327 
287 
33-5 
367 
49* 
46-8 
29* 
41-4 
371 
82* 
327 
892 
37*1 
457 
337 
1864 
49* 
1844 
27* 
£*32-0 
331 
32-3 
34 8 
33-3 
375 
30-5 
487 
23-5 
41-7 
43* 
342 
40-5 
89*6 
26-5 
35* 
37* 
45-3 
473 
421 
41-4 
33-4 
28-3 
27-2 
377 
41 5 
417 
33* 
47-3 
427 
321 
257 
35* 
365 
227 
36* 
44-2 
1864 
48-2 
1834 
314 
35'1 411 
33-3 
34-8 
38-3 
297 
39-3 
30-6 
40-6 
22-6 
88*8 
38*1 
32* 
40-4 
237 
16* 
30-6 
41* 
87-3 
43-8 
45-5 
40 9 
33* 
317 
26-3 
45* 
437 
428 
39-4 
46-0 
41-9 
317 
30-8 
33-3 
35-4 
23* 
391 
35-4 
21* 
39* 
41-2 
49-5 
307 
451 
35*9 
16* 
1841 
49-5 
1867 
32-6 
30-o| 50* 
32-7 
33-5 
336 
28-5 
387 
33* 
44 3 
30-4 
86*5 
36-5 
26* 
34* 
23* 
14* 
307 
86-3 
377 
337 
461 
37-1 
34-3 
88* 
30-1 
39-3 
221 
14* 
1841 
50-3 
1869 
36-3 
27-0 45-8 
29-6 
34-7 
34-5 
375 
441 
31*3 
41-3 
417 
31-8 
457 
23* 
28-9 
327 
22-3 
287 
387 
35* 
32-3 
43* 
31 G 
321 
42* 
31-5 
35-8 
34* 
42* 
37-5 
42-8 
36* 
44-2 
42-1 
32-3 
337 
19-4 
48-7 
37-1 
31-3 
43-3 
37-8 
•11-8 
29-9 
46-1 
360 
19-4 
1861 
48-7 
1862 
29-3 
S7-5 46-0 
31*7 
34-8 
357 
378 
473 
287 
433 
42-6 
32* 
437 
231 
35-3 
307 
357 
28* 
39-0 
39-8 
401 
38-8 
29* 
31*5 
447 
43* 
32-4 
47-5 
37* 
34* 
333 
45-4 
461 
37* 
35-5 
15-6 
45-3 
38-3 
36-8 
47-0 
38* 
40-1 
317 
40-9 
369 
15-6 
1861 
47-5 
1853 
31-9 
27-4 45-9 
34-3 
33-0 
33*0 
33-6 
447 
331 
47* 
496 
347 
29-3 
20-4 
45-3 
257 
35-4 
32-3 
350 
887 
47*3 
38-1 
27* 
31-4 
377 
30-4 
473 
46‘4 
46-5 
35*1 
34-4 
29-5 
40-4 
40-3 
447 
382 
26-9 
47* 
.37-3 
38-8 
44-8 
327 
32-3 
31* 
39* 
36-9 
20-4 
1838 
49-6 
1835 
297 
24-2 36-3 
41*5 
353 
317 
36*3 
42-8 
357 
47 1 
46* 
31-6 
377 
17* 
44*3 
30-5 
327 
33* 
324 
39-6 
44-5 
33-5 
32-1 
367 
36* 
30* 
48-6 
46-1 
49-4 
35-4 
37-9 
317 
35-6 
347 
44-6 
38-1 
35-3 
431 
37-0 
38-8 
437 
31-5 
25-3 
40-1 
40-4 
37'° 
17* 
1838 
49-4 
1853 
31-8 
21-9 40-6 
46-5 
34-3 
29-6 
35-4 
371 
398 
49* 
437 
34-5 
43* 
22-8 
477 
341 
341 
317 
41-6 
397 
41-3 
40* 
31* 
43-3 
50-8 
27* 
47-0 
43-6 
44-4 
357 
36* 
28-8 
33-5 
37* 
38-8 
37* 
301 
38* 
40-8 
36-3 
38-7 
40-7 
20-2 
45-0 
37-9 
37‘3 
207 
1867 
50-8 
1849 
30-6 
20-sl 47-8 
39*6 
350 
307 
35-8 
33-5 
39-3 
477 
471 
457 
35-8 
19-4 
411 
40* 
357 
34-3 
34-4 
36-3 
411 
42-4 
274 
40-5 
46-0 
29* 
447 
45-4 
407 
35-3 
310 
28* 
29-4 
32* 
36-8 
41-5 
28-8 
387 
39-3 
373 
40-6 
49-3 
22-6 
48-4 
33-6 
37-1 
19-4 
1838 
49-3 
1866 
29* 
17-9 36-0 
357 
347 
31-5 
320 
297 
387 
477 
47*3 
38* 
345 
15* 
37* 
44-3 
35-8 
30-3 
32* 
300 
406 
44* 
29-0 
321 
38-0 
274 
45-7 
50* 
441 
36-2 
29-3 
30* 
35-1 
40-3 
35* 
44-4 
26* 
34-9 
39* 
34* 
37-3 
44-6 
27-7 
45-2 
44-7 
36-1 
15* 
1838 
50* 
1852 
35* 
1^1 44-3 
25*3 
29 4 
277 
341 
324 
38* 
48* 
41*2 
33-4 
35-4 
257 
33-3 
42-3 
45-6 
386 
36* 
307 
40* 
45* 
31-3 
301 
42-8 
30-8 
487 
45-3 
39-8 
42-6 
31-6 
36-6 
36-3 
40-4 
34-1 
37* 
27-0 
30-5 
38* 
33-3 
36-6 
46-8 
31-3 
46-6 
43-8 
367 
19-1 
1826 
48-9 
1834 
29-8 
263 401 
475 
27*4 
22-5 
39* 
36* 
38-5 
477 
34-3 
354 
39* 
268 
30-4 
391 
48*5 
33-6 
39-3 
39-2 
397 
43-8 
20-3 
37* 
467 
328 
447 
42-4 
377 
47-2 
261 
43-3 
36-6 
341 
46-4 
33* 
341 
27-1 
37-5 
39-3 
34-0 
46-1 
27-3 
48-2 
45-8 
37* 
22-5 
1830 
48-5 
1841 
26* 
24-8 34-8 
51*5 
276 
227 
40-4 
35-4 
35* 
447 
33-4 
396 
36* 
227 
323 
380 
421 
31-5 
41-8 
41-5 
40* 
42-4 
30-4 
334 
45-3 
33-4 
39-4 
33-8 
35-6 
447 
26* 
457 
46-6 
35-6 
48* 
33-7 
33-3 
26-1 
37* 
40-8 
354 
47-5 
27* 
457 
35* 
37-1 
227 
"11838 
51-5 
1828 
288 
53-5 
277 
22-3 
45-3 
32-8 
36* 
41-6 
327 
82-3 
35-4 
17*1 
400 
478 
337 
308 
38-6 
42* 
387 
482 
30-6 
33* 
48* 
38* 
427 
38-0 
44-9 
378 
22-3 
47-1 
40-3 
40-8 
40-7 
38-6 
35* 
257 
467 
46-3 
331 
480 
263 
42-9 
36-3 
375 
17-4 
1838 
535 
1828 
361 
37-8 29-8 
50-7 
28-3 
32-1 
427 
337 
33-8 
437 
30-4 
374 
33-6 
77 
42-3 
46-8 
30-1 
327 
361 
38* 
387 
457 
30-4 
81-3 
46‘9 
291 
44-5 
44’6 
401 
44-4 
27* 
467 
37-7 
431 
443 
39* 
40-3 
29-3 
41-5 
453 
327 
46-4 
28-3 
36-5 
33-4 
37*3 
7-7 
1838 
507 
1828 
430 
26 6 25-9 
4*4 
26-6 
35*1 
458 
41*0 
317 
487 
30-6 
383 
40-8 
287 
44-4 
48* 
32*1 
32-6 
36-4 
417 
327 
48*4 
33-5 
81-8 
46‘1 
30-2 
46-3 
43-4 
42-7 
44* 
237 
44* 
33* 
38-8 
44-3 
257 
50-1 
27-3 
36-3 
33-3 
377 
237 
1855 
501 
1866 
26* 
257 24-5 
49*2 
26-9 
34-3 
478 
420 
30-6 
48-4 
35-4 
46-8 
48* 
387 
34-4 
451 
375 
34-3 
407 
373 
38-6 
491 
34-0 
81* 
44-4 
33-6 
38-5 
30* 
390 
39-6 
277 
891 
377 
337 
417 
397 
357 
41-4 
43-8 
48-7 
28-6 
48-4 
26-6 
36-1 
32-8 
38-3 
24-5 
1827 
492 
1828 
247 
36 4 287 
47*8 
22-9 
331 
42* 
36‘5 
27*3 
54-6 
39* 
49-6 
487 
31-6 
36-3 
61-6 
37*1 
32-3 
44-6 
39* 
42* 
47* 
38-6 
32-0 
47-6 
365 
36* 
37*3 
40-3 
40* 
29-4 
497 
378 
31-8 
387 
40-8 
34* 
38-5 
44-8 
377 
34* 
44-3 
42-9 
33-6 
29-1 
388 
22* 
1829 
54-6 
1834 
28* 
24-0 30-2 
49*2 
24*5 
366 
347 
375 
287 
34-9 
29-8 
38-2 
24-5 
1829 
52-5 
1846 
237 28-7 
46-6 
25*1 
35*9 
29-5 
39*8 1 
32-4 
46-3 
457 
39* 
437 
27*1 
41 5 
437 
34-3 
357 
46-7 
39* 
40* 
63-3 
41-1 
29-9 
48*0 
433 
36-4 
41-8 
371 
371 
33* 
42-6 
357 
31*6 
483 
37-0 
473 
385 
44-6 
377 
32-3 
38-3 
441 
40-3 
33-8 
38-8 
251 
53-3 
287 
In* 30-4 
46*1 
391 
35*6 
28*3 
36* 
336 
51-4 
46* 
42-4 
40*1 
28’8 
840 
447 
45-5 
401 
24-4 
1848 
514 
1834 
27* 
I 30-6 ! 26 4 
46-1 
397 
35* 
33-6 
32-8 
877 
497 
42-6 
441 
36* 
297 
81*4 
39-3 
43-6 
387 
■ >17 
44-3 
88 9 
467 
44* 
261 
89* 
317 
37-6 
41-6 
42-1 
45-7 
33* 
40* 
521 
37-9 
35-6 
38-7 
25-5 
1855 
521 
1867 
281 
23-5 35 3 
42*7 
36-0 
34-9 
330 
34-5 
40-5 
477 
39* 
44-6 
34* 
32-1 
327 
471 
37-3 
34-4 
61* 
447 
47-0 
387 
32-6 
39* 
42-3 
40* 
42-7 
1848 
51* 
1843 
36-4 40-8 
41* 
337 
337 
29-5 
41*3 
39-6 
32-5 
45* 
381 
33-4 
40*3 
32* 
417 
38-6 
36* 
617 
45-8 
31-3 
47-1 
33-6 
367 
35* 
42* 
481 
367 
390 
60-6 
30* 
28* 
23-4 
40-8: 
44-1 
36-5 
36-4 
48* 
457 
27-2 
287 
437 
471 
387 
44* 
38, 
23-4 
1857 
517 
1843 
283 
43-4 39-8 
417 
37*1 
31-0 
26-4 
40-8 
34*3 
41* 
43-3 
37*8 
39-4 
35-3 
261 
35-3 
38* 
371 
48-3 
42-5 
30-4 
46-8 
36-8 
43-1 
38-4 
34-1 
40-6 
41-2 
40-0 
49-2 
287 
20-8 
27-1 
47-1 
39-1 
38-8 
HI 
48-7 
47-1 
31-3 
36-6 
42-4 
43-5 
42-1 
46* 
38-9 
261 
1839 
497 
1869 
30* 
«-4 41-8 
45-1 
367 
237 
307 
40-5 
60-0 
33-2 
37*1 
36-8 
417 
38-9 
41* 
36* 
48-2 
277 
287 
28-0 
371 
36* 
34* 
42-6 
627 
44-7 
352 
383 
481 
38-2 
48-4 
537 
39-0 
237 
1830 
53, 
22-5 25 7 
41-7 
33-2 
1 32-31 35-6 
36* 
- 
45-6 
38-8 
38* 
387 
28-5 
37-6 
- 
•» 
33, 
+0+ 
38, 
38, 
+3, 
34, 
34, 
so. 
33-4 
40-4 
42-2 
387 
38-8 
36* 
361 
s,a 
37‘4 
’ in January in the years 1828 to 1889 me 7°,, and it took place on the 20th dny in tho year 1838. 
J in January in the yean 1826 to 1869 was 64°-6, and it took place on the 23rd day in the year 1834. 
i 46°*, and it represents the extreme difference between the Mean Temperature of two days in the month of 
Tho day of tho month whoBo Moan Tompei 
7° 7 ; and in the year 1828 it was 60°7 ; t 
Tho day of the month whoso Mean ' 
and in tho year 1864 it was 49 0, 2; 
jeon subjected to the greatest difference was the 20th; in the year 1838 its Mean Temperature was 
nucule between these numbers is 43 o, 0. . „ _ , 
is been subjected to the least difference was the 30th ; in the year 1839 its Mean Temperature was 26 -1 ; 
a these numbers is 28 0, 1. 
