96 
METEOROLOGICAL REPORT. 
Sydney, Month of August, 1857- 
From observations taken at 9 a.m. and 9 p»m, each day. 
X 
rt 
P 
l 
fcio 
3 
< 
Barometer, Reduced, 
etc. 
Temperature of Air. 
Moisture. 
a? 
G 
o 
o 
Cloud, 
Winds. 
4 
Remarks 
on 
Weather, etc. 
S 
ri S 
O G. 
‘c O 
a *2 
S 5 
S3 
Maximum. 
Minimum. 
Greatest 
Range. 
Dew point. 
Rain. 
Inches. 
| Mean extent. 1 
Form. 
Gene ral 
Direction 
1 
29-888 
48*2 
64-5 
38-6 
25-9 
42-2 
•00 
4 
0 
Cu. 
West 
Clear and fine 
2S 
30021 
46-5 
62-4 
348 
27-6 
423 
■00 
8 
5 
Cu.Cu.-St 
South 
Clouds collecting 
3 
30 320 
47-6 
58-6 
42-5 
161 
44-7 
•42 
8 
4 
Cu 
South 
Dark clouds 
4 
30-408 
44-5 
62-8 
342 
28G. 
433 
•00 
4 
o 
Ci-St. 
W Calm 
Lunar halo 
6 
30-400 
44-5 
65-9 
333 
32-6 
40-8 
■00 
2 
0 
WNW. Calm 
Very fine 
6 
30-492 
61 5 
333 
28-2 
439 
00 
6 
4 
Cu.-St. 
SSE. 
30478 
52-0 
453 
49 1 
•06 
7 
10 
Cu. 
South 
Gloomv clouds and 
8 
30-437 
51-2 
5S-8 
45-1 
13-7 
49-4 
03 
8 
10 
Cu. 
£>outh 
f drizzling rain 
9S 
30-399 
54-0 
631 
43-4 
19-7 
49-1 
.00 
6 
4 
Cu. 
CakVi VANE 
j 
10 
30-000 
52-1 
... 
41-3 
50-6 
•03 
8 
6 
CuC-'u-St.St 
XXl5\ 
Curious clouds 
11 
30-415 
52-8 
60-8 
423 
18-5 
434 
•00 
7 
4 
Cu. 
SoilllL? 
Fresh breezes 
12 
30-427 
49-0 
56 0 
42-5 
13-5 
45.6 
•09 
8 
4 
Ni. 
South 
Fine rainbow 
13 
30-253 
47-7 
01 0 
424 
18 6 
46-7 
*05 
8 
6 
Ni. 
South 
Mis tv rain 
14 
30 016 
506 
56*5 
43-1 
13-4 
40-4 
•17 
8 
6 
St. Cu. 
North 
Much clouds & scud 
15 
30 016 
49-3 
671 
390 
281 
4G-1 
*00 
7 
1 
Cu. Cu.-St. 
Calm 
Fine weather 
16S 
30-099 
47-2 
630 
393 
24-3 
41-1 
•00 
6 
0 
West 
1 Beautifully clear 
17 
30 092 
51-2 
050 
340 
31-0 
41*5 
■Oo 
0 
0 
NW 
j and tine 
18 
30-131 
52-4 
67-7 
42-4 
253 
4G-2 
•11 
8 
6 
Ni. 
A r ariable 
Thunder cloud 
19 
30 270 
54*2 
59-5 
44-2 
15-3 
47-9 
*00 
8 
7 
Cu. 
S. SSE 
Dloudv 
20 
30-020 
58-6 
02-0 
47-9 
141 
53-8 
1-72 
8 
10 
Ni. 
ESE. EXE 
Stormv 
21 
29-750 
58-0 
58 8 
54-9 
39 
54-2 
1-57 
10 
10 
Ni. 
SE. S 
Gales *& heavy rains 
22 
29-933 
51-3 . 
620 
52-3 
9-7 
48-7 
*13 
8 
3 
Ni. Cu. St. 
South 
Floods in the country 
23S 
29-903 
52-8 
01-3 
416 
19-7 
501 
.18 
8 
10 
Cu. 
V ariable 
Gloomv 
24 
30-008 
495 
648 
40-3 
24-5 
45-3 
‘00 
7 
0 
Cu. 
SW. SE 
) , , 
25 
30 008 
54-9 
65-8 
36-3 
29-5 
47-2 
•00 
7 
0 
W. N 
26 
29.955 
53-7 
70-1 
38 9 
31-2 
44-2 
■00 
7 
9 
Ci.-St. 
W est 
Dark veil of cloud 
27 
30-100 
46-5 
596 
34-3 
25-3 
41-8 
•00 
7 
1 
Cu. 
West 
Heavv dew 
28 
30 082 
531 
66-5 
39-3 
272 
47-2 
‘00 
7 
8 
Ci-.St. 
SE 
Dark veil of cloud 
29 
30-113 
50-6 
650 
44-8 
20-2 
43-6 
‘00 
7 
1 
S. SE 
30S 
30-107 
55‘2 
63-5 
304 
271 
49-3 
•00 
7 
7 
S. E. 
31 
30-222 
551 
62-4 
48-3 
14-1 
51-7 
•00 
5 
9 
Cu. 
SE 
Confused clouds 
30167 
51-0 
62-6 
41-2 
21-6 
46-5 
4*56 
7 
4-7 
Means and 
sums. 
30-499 
59-0 
70-1 
36-8 
55-1 
10 
10 
. Highest ) of single readings 
29-693 
40-7 
33-3 
... 
38-7 j 
0 
°l 
. Lowest ] at 9 a,m. or 9 p.m. 
N,B.—The observations are not corrected for diurnal 
range. The principal instruments have been com¬ 
pared at Greenwich, and the read ing s are alL reduced 
accordingly, 
Pressure ,—The barometer is 11 feet above the sea-level. 
The greatest range of pressure is 806 inch The 
mean gaseous pressure of dry air is 29*850 inches. 
Temperature of Air ,—The mean of all self-registered 
maxima and minima is 51*9 degrees. The adopted 
mean temperature of the month from all observations is 
therefore (the mean of) 51*04-51*9, or 51*45 degrees 
Fahrenheit. The adopted mean of the month for the last 
two years is 51.45 degrees. 
Moisture .—The dew-point is calculated from readings of 
Ne w retti’sand Zambra’s dry and wet bulb thermome¬ 
ters, by the use of Glaishcr’s tables. 2nd Edn. 
The mean temperature of evaporation at 9 a.m. and 
9 p.m., is 48*8 degrees. The mean clastic force of 
vapour is 0 317 inches. The average proportional 
humidity of the air is denoted by 85, perfectly dry 
air being taken as 0, and saturated damp air as 100. 
Rain .—More or less rain fell on 12 days during the 
month. The total depth being 4*56 inches. During 
the same month of 1855 and 1856, the total depths 
of rain were respectively *62 and *65 inch. 
The rain is collected at* one foot above the ground, 
and measured at 9 p.m. 
Cloud .—The extent of cloud is expressed by the tenths of 
the whole sky covered by it. 
The forms of clouds are denoted as follows, the num¬ 
ber of days on which each kind occurred during 
the moutfi being added in figures. 
Cu. Cumulus 16 Ci-Cu. Cirro-cumulus. ... 0 
Ci. Cirrus.1 Ci.-St. Cirro-stratus ...... 3 
St. Stratus.2 Ca-St. Cumulo-stratus ... 4 
Ni. Nimbus,...G. 
TFind-t.—The winds may be thus summed up. 
N W 
i 
day 
SSE 
11 day 
WNW 
i 
S E 
31 „ 
West 
5 
n 
ESE 
1 
East 
1 - 
S W 
1 
»♦ 
—■— 
South 
10 
ENE 
i ,! 
N N E 
11 .. 
Calm 
21 
North 
11 - 
Variable 
2 
The irregular or non-periodic character of the Austra¬ 
lian climate, could not he more strikingly shown than by 
comparing the mean results of this month, as regards 
moisture, rain, and clouds, with those of the same month 
of 1855 and 1856, as given in the table, page 45. 
. W..9, JEVONS. 
Double Bay, near Sydney, N.S.W. 
