APPLIED TO METEOROLOGICAL OBSERVATIONS. 
133 
Table VI. — Showing the mean depression of the temperature of the dew-point below 
that of the air at the height of four feet above the soil at every hour in each 
month. 
Local 
mean time . 
Jan . 
Feb . 
March . 
April . 
May . 
June . 
July . 
August . 
Sept . 
Oct . 
Nov . 
Dec . 
O 
O 
O 
O 
0 
O 
O 
liVlidnight . 
2'5 
2-5 
2-8 
2-8 
2-5 
3-1 
2*8 
1*9 
1*5 
1-7 
2*0 
2*6 
1 A.M. 
2-8 
2-6 
2-5 
2-4 
2-2 
2*6 
2-2 
1*4 
1*2 
1*4 
2*1 
2*6 
2 
2-9 
2-6 
2-5 
2-0 
1-9 
2*4 
1*8 
1*2 
1*0 
1*2 
2*1 
2-6 
3 
2-7 
2*4 
2*4 
1*7 
1-6 
2*0 
1*6 
1*0 
0*8 
1*0 
2*0 
2*5 
4 
2’6 
2-1 
2-3 
1-6 
1-6 
1-7 
1*5 
0*9 
0-6 
0*9 
1*9 
2*1 
5 
2-3 
2-0 
2-3 
1-7 
1-6 
1*8 
1-7 
1*0 
0*7 
0*9 
1*8 
2*0 
6 
2-2 
2-0 
2-4 
2-5 
2*1 
2-7 
3*0 
1-7 
1*0 
1*3 
1*7 
2*0 
7 
2-1 
2-2 
2-8 
3-7 
3-6 
5-1 
5*1 
3*0 
1*9 
1*9 
1*7 
2*0 
8 
2-1 
2*3 
3”7 
4-6 
4*5 
6-3 
6*0 
4*2 
2*5 
2*4 
1*8 
2*1 
9 
2-2 
2-8 
4-7 
6-1 
5-8 
8*1 
7-5 
5-7 
3-7 
3*3 
2*3 
2*3 
10 
2-5 
3-6 
5*6 
7-8 
7-1 
9-8 
8-8 
7-3 
5-0 
4*1 
2*7 
2*8 
11 
3 1 
4-3 
6-6 
9-4 
8-5 
11*1 
9-9 
8-8 
6-6 
5*3 
3*1 
3*4 
Noon. 
3-7 
4-7 
7-5 
10-6 
9-5 
12-1 
10*6 
9-9 
7-9 
6*4 
3-7 
3*7 
1 P.M. 
3-9 
5-2 
8-1 
11-5 
10-3 
12-9 
10*8 
10*7 
8-6 
7*1 
4*3 
4*1 
2 
4-4 
5-3 
8-6 
12-1 
10*6 
13*3 
IM 
10*9 
8*9 
7-5 
4*6 
4*2 
3 
4-6 
5-2 
8-5 
12-0 
10*3 
13*0 
11*0 
10*3 
8-7 
7-3 
4*4 
4*3 
4 
4*5 
4-8 
8-1 
11-0 
9*5 
12*1 
10*3 
9-7 
7-9 
6-4 
3*8 
4*0 
5 
3-6 
4-0 
7-5 
10-1 
8-7 
11*1 
9*5 
8*9 
6-7 
5-3 
3*3 
3-7 
6 
3*1 
3-1 
6*5 
9-0 
7-6 
10-0 
8*5 
7*8 
5-5 
4*4 
2*8 
3*4 
7 
2-3 
2-5 
5-0 
6-8 
6*4 
9-0 
7-1 
6*3 
4-3 
3*6 
2*6 
3*1 
8 
2-1 
2-3 
3-9 
5-5 
5*3 
7-5 
6-0 
4*8 
3*1 
2*9 
2*4 
2*8 
9 
2-0 
2-1 
3-3 
5-0 
4*3 
6*0 
4*8 
3*5 
2*4 
2*4 
2*1 
2-7 
10 
2-0 
2-0 
3-0 
4-1 
3*6 
4-7 
3*7 
2*6 
1-7 
2-0 
2*0 
2-6 
11 
2-1 
2-1 
2-6 
3-1 
2*7 
3*5 
3*1 
1*8 
1*3 
1-7 
1*9 
2-4 
The times at which the least and greatest excess of air-temperature above dew- 
point temperature, with the amounts of the differences, were as follows : — 
2°*1{ 
.4n(l it 1 
took place J 
rat ll’' 20“ P.M., and-l greatest* 
AO.rf And it 
^ took place 
,}at 3'“ 20“ P.M. 
Feb. 
5> 
was 2°*0 
99 
from 5** 20“ A.M. to 7*^ 0“ A.M. ; was 
5°*3 
99 
at 1^ 40“ P.M. to 2 ^ 40“ p.m. 
Mar. 
was 2°*4 
99 
from 4^ 0“ A.M. to 5'' 40“ A.M.; was 
GO 
o 
55 
at 2'* 40“ P.M. 
April 
was ■4°*6 
99 
at 4’^ 20“ A.M. ; „ was 
12°*1 
55 
at 2'* 20“ P.M. 
May 
was 1°*5 
99 
at 5** 0“ A.M. ; „ was 
10°*5 
55 
at 1** 40“ P.M. 
June 
>5 
was 1°*8 
99 
at 4^ 40“ A.M. ; „ was 
13°*3 
55 
at l’^ 40“ P.M. 
July 
was 1°*5 
99 
from 3^ 40 “a.m. to 4*1 40 “a.m.; was 
11°*0 
55 
from 1^ 40“ p.m. to 3** 0“ p.m. 
Aug. 
99 
was 0°*8 
51 
from 3’^ 40 “a.m. to 4’' 20 “a.m. ; was 
o 
o 
CO 
55 
at 1'* 20“ P.M. 
Sept. 
99 
was 0°*6 
99 
at 4^* 40“ A.M. ; „ was 
8°*9 
55 
at I’* 20“ P.M. 
Oct. 
99 
was 0°*9 
99 
at 4'' 20“ A.M. ; „ was 
7°*5 
55 
at 2 ^ 0“ P.M. 
Nov. 
99 
was 1°*6 
99 
from 6*^ 20 “a.m. to 7 ^ 20“a.m.; was 
4°*6 
55 
from 1^ 40“ p.m. to 2 ^ 20“ p.m. 
Dec. 
99 
was 2°*0 
99 
from 4^ 20 “a.m. to 7 ^ 20“a.m.; was 
4°*3 
55 
from 1^ 40“ p.m. to 3*' 0 “p.m. 
The time at which the temperatures of the air and of the dew-point were most 
nearly alike, was in September at 4^ 40” a.m., and the time at which the greatest 
difference took place between these temperatures, was in June at 40” p.m. The 
times of the least difference are at about the time of sunrise at all seasons or the year, 
and the times of the greatest difference are at about the time of the maximum tem- 
perature of the air at all periods. 
