201 
METEOROLOGICAL REPORT. 
Sydney, Mouth of Jasoahy, 185S. 
From observations taken' at 9 a.m. and 9 p.m. each day. 
SB 
4 
5 
6 
r 
8 
9 
10S 
11 
12 
13 
14 
15 
ie 
17S 
18 
19 
20 
21 
22 
23 
24S 
25 
26 
27 
28 
29 I 
30 I 
31S 
Temperature of Air. 
Moisture. 
29- 950 
•702 
■919 
■900 
•750 
•963 
•837 
•939 
■848 
■773 
•773 
■896 
30- 036 
29-828 
*552 
•635 
'396 
■914 
SO-OS8 
■108 
•079 
■104 
■172 
■136 
•220 
•196 
•088 
•049 
•058 
29-924 
■895 
708 
74-9 
73- 2 
752 
86-0 
69- 3 
75'0 
70'3 
759 
811 
72-2 
70'3 
70- 3 
74- 8 
87-4 
09'6 
68-0 
64-2 
09-2 
71- 6 
72- 9 
73'5 
729 
"3-5 
74*1 
73- 7 
73-G 
73'6 
75'0 
73- 0 
74- 2 
78-4 
87-8 
78-1 
85-3 
102-8 
84 8 
84-2 
80-6 
87-5 
90-8 
83-6 
70-2 
705 
83-4 
1080 
839 
8G-8 
09-8 
77-0 
80-8 
81-8 
80.7 
SI 7 
824 
832 
83-8 
SAG 
81-3 
85-0 
830 
916 
30233 
I 29-217 
920 
644 
581 
600 
611 
630 
63-7 
673 
08-3 
630 
68-3 
62- 3 
650 
CS-4 
63- 7 
66-7 
696 
686 
6 C-S 
55-G 
58-4 
58-3 
55‘5 
550 
545 
540 
58-3 
573 
56 3 
55-7 
61-8 
68-6 
Gl-8 
1080 
29- 931 73-7 8-M 
30- 007 | 704 I 79'4 
20-3 
27-S 
1V0 
22-3 
391 
17- 5 
15-9 
236 
19-2 
28"5 
18- 6 
7'8 
6-8 
16'7 
384 
15-3 
200 
14-2 
18-6 
22-5 
26- 3 
25- 7 
27- 2 
2S1 
24- 9 
26- 5 
28- 3 
25- 6 
23-2 
150 
29- 8 
.5 S 
*<! -T 
Cloud', 
51-0 
61-8 
59-8 
61- 5 
63-8 
63- 8 
69-5 
64- 4 
62- 7 
07-6 
G8-3 
69- 7 
C41 
07-0 
070 
64-7 
70- 3 
C6-C 
G2-6 • 
61-2 
49-8 
53.7 
58-8 
58-7 
CO-6 
0T2 
62'7 
02-2 
633 
65-3 
61-2 
65-5 
663 
61-6 
54-0 
22-3 
19-6 
71-2 
49-7 
63-5 
61-0 
00 
00 
16 
00 
00 
00 
00 
-00 
•00 
•00 
■33 
•19 
•40 
•00 
■00 
•00 
•01 
•07 
■00 
■00 
•00 
•00 
■oo 
•oo 
•00 
•00 
•00 
•0(5 
• 1)0 
•00 
•00 
119 
128 
119 
120 
1 
5 
6 
11940 
10010 
12740 
124| 0 
10 
6 'Cu. Cu.-St. 
Cu. Ci.-St. 
si. 
Cu. 
Cu.-St 
Cu. Ci.-St. 
Cu. 
Winds. 
Remarks 
Weather, etc. 
124 
11 
125 
88 
86 
119 
142 
98 
127 
92 
112 
124 
125 
124 
126 
116 
123 
124 
124 
125 
119 
127 5 
•40 
116 
3-27 
142 
118-55 
1-57 
Haze. 
HazL 
Ni. 
Ni. 
Ni. 
Cu.-St. 
Ci.-St. 
Cu. 
Ni. 
Cu. 
Cu. 
Cu. 
Cu. 
Cu. 
Cu. 
Cu. 
Cu. 
Cu. 
Cu. 
Ci.-St. 
Ci.-St. 
Ci.-St 
Cu. 
NE. 
NE. 
SSE. NE. 
NE. 
WNW.SSE] 
ESE. NE. 
NE. 
NNE 
NNE. 
W. SSE. 
83E. NE. 
SSE. 
SE. NE. 
North. 
NW. Tar. 
East. 
NW. SE. 
SE. 
NE. 
NE. 
NE. 
NE. 
NE. 
NE. 
NE. 
NE. 
NE. NNE. 
NNE. 
NNE. 
NNE. 
NW. S. 
| Fresh sea-breezes. 
Lightning. 
Fiae, hut warm. 
Hot wind & ‘ Souther!y ’ 
Fine. 
Fine. 
Hot and cloudless. 
| Red suUssts. 
Partial storm, 
j Dark clouds and 
j light rain. 
Thunderclouds. 
Extreme hot-wind. 
Cloudy. 
Squalls. 
| Cloudy. 
Very fine hut hot 
weather. 
Detached cumuli and 
regular sea-breezes 
during the days. 
J Hot weather. 
Hazy air. 
Lowest J at 9 a.m. or 9 p.m. 
Means and sums. January, 1858. 
Means, '&c., of January, 1856,1857- 
77 . P,.— The observations are not corrected for diurnal 
Tange The principal instruments have been compared 
at Greenwich, and the readings are all reduced ac¬ 
cordingly. 
Pressure,—the barometer is 11 feet above the sea-level 
The greatest range of pressure is 1 '016 inches. The 
minimum reading of this month, 29-217, (at 9 a.m. 
of 17th) is the greatest depression which has occurred 
during nearly three years. _ # ^ 
The mean gaseous pressure of dry air is 2ft311 
inches. The average weight of a cubic foot of air is 
517 grs. . » 
Temperature, of Air .—The mean of all self-registered 
maxima and. minima is 73*0 degrees. The adopted 
mean temperature of the month is, therefore, 73'3 
degrees. This is higher by 3'4 degrees than the 
adopted mean temperature of the month fur the last 
two years. 
Moisture . — The dew-point is calculated from readings of 
Xegretti'sand Zamira’s dry and w et bulb thermome¬ 
ters, by the use of Glaisher’s tables. 2nd Edn. 
Tho mean temperature of evaporation at 9 a.m. and 
9 p.m. , is 67'S degrees. The moan elastic force of 
vapour is - 586 inch. The average proportional 
humidity of the air is denoted by 70, perfectly dry 
air being taken as 0, and saturated damp air as 100. 
Rain . — More or less rain fell on 6 days during the 
month. The total depth being 146 inches. It is 
collected at one foot above the ground, and measured 
at 9 p.m. 
Evaporation . — The total depth of water evaporated wit^ 
full exposure to sun and wind is 7'32 inche ? 
Omitting one day. 
Sun's heat is indicated for each day hy the highest read¬ 
ing (self-registered) of a thermometer with a 
blackened bulb placed one inch above the surface of 
the ground. 
Cloud.-— The extent of cloud is expressed by the tenths 
of the whole slcy covered by it. 
The forms of clouds are denoted as follows, the num¬ 
ber of clays on which each kind occurred being 
also added in figures. 
Cu. 
Ci. 
St. 
Cumulus 17 
Cirrus.0 
Stratus.0 
Ci.-Cu, 
Ci.-St. 
Cu.-St. 
Cirro-cumulus. ... 0 
Cirro-stratus . 7 
Cumulo-stratus ... 2 
i. Nimbus 
...5 
Haze . 
. 2 
ids. —Tho winds may be thus summed up. 
NW. 
days. 
SSE 
3 days. 
WNW. 
i ,, 
S E 
2 „ 
West 
i „ 
ESE 
i « 
East 
i „ 
South 
i 
NE 
144 „ 
Var. 
i „ . 
North . 
NN E 
4 
N.E. sea-breezes greatly prevailed this mouth, as sec 
above. 
W. S. JEVONS. 
Double Bar, near Sydney, N.S.W. 
