37 
In January, from 
„ February, „ 
,, March, ,, 
,, April, ,, 
„ May, 
,, June, ,, 
» J uly, 
„ August, „ 
„ September, ,, 
„ October, „ 
,, November, ,, 
„ December, ,, 
o 
8-3 
in 1830 
to 
o 
19-4 
in 
1858 
97 
„ 1843 
,, 
21-2 
1857 
13-5 
„ 1839 
>> 
22-6 
,, 
1854 
14-8 
„ 1829 
30-6 
>> 
1865 
17-6 
„ 1828 
,, 
34-3 
1848 
16-4 
„ 1830 
J J 
33-1 
1858 
17-6 
„ 1829 
>5 
30-4 
99 
1864 
17-0 
„ 1829 
„ 
30-5 
1864 
16-1 
„ 1827 
31-2 
1865 
13-6 
„ 1838 
24-1 
„ 
1861 
11-0 
„ 1835 
20-3 
>> 
1861 
87 
„ 1844 
„ 
16-5 
1861. 
Mean daily ranges, differing so greatly in eacli month, may well be 
attended with different agricultural and horticultural results. 
The numbers in the bottom line show the average daily range in 
each month ; and by taking the difference between these numbers and 
those in each year, the departure from the average will be found. 
The gradual increasing numbers, from January 12°*2 to July 28° - 5, 
and the gradual decrease month by month to December 12 0, 2, the 
same as January, indicates the annual law of daily range of tempera¬ 
ture. 
By taking the mean of all the daily ranges on the same day of the 
year from a'll the years, or the means of the numbers in every horizontal 
line in Tables XXX. to XLI. Table XLIY. was formed. 
By selecting the least and greatest of these mean values in each 
month we find that the mean daily range of temperature has varied 
In January, from 
97 
on the 11th day to 
15‘0 on 
the 29th 
„ February, „ 
12-4 
„ 2nd „ 
16*4 
„ 17th 
,, March, „ 
13-6 
„ 2nd 
20-4 
„ 31st 
„ April, „ 
18*4 
( 9th and > 
” } 12th J ” 
235 
„ 20th 
„ May, „ 
20-9 
„ 1st 
24-6 
„ 17th 
,, June, „ 
21-2 
,, 7th ,, 
25-3 
„ 23rd 
» July, 
20'9 
„ 24th 
26-8 
„ 5th 
„ August, „ 
20-9 
„ 6 th 
247 
„ 4th 
„ September, „ 
197 
( 16th and) 
” l 28th \ ” 
247 
„ 12th 
„ October, ,, 
15-5 
„ 31st 
21-1 
15 th and 
” l 6th 
„ November, „ 
13-0 
„ 23rd 
16-9 
„ 3rd 
„ December, „ 
10-8 
„ 21st „ 
14-1 
,, 25th. 
The smallest range in the year is therefore on January 15, and the 
largest is on July 5. 
By taking the mean of all the numbers in each column the mean 
monthly daily range is shown; these are the same as in the bottom 
line of Table XLIII., and these agreements are a proof of the general 
accuracy of the work. 
