APPENDIX 49
(Chapter 24: The Environment) Climatological Summary, 1996
APPENDICES
Mean
pressure
Maxi-
mum
Mini-
I
Mean
mum
Meun
Mean
Mean
Total
Prevailing
Mean
at mean air temp- sea level
air temp-
air temp-
dew
relative
amount
bright
Total
wind
wind
erature
erature
erature
point
humidity
of cloud
sunshine
rainfall
direction
speed
Month
(hectopascals)
(°C)
(°C)
(°C)
(°C)
(%)
ز را گراهام
(hours)
(mm)
(degrees)
(km/h)
January
1 019.0
24.1
17.8
12.1
12.3
71
63
134.4
1.3
070
26.7
February
1 020.7
26.4
14.9
5.8
10.1
74
73
80.0
27.2
010
28.5
March
1 014.5
28.5
19.7
10.8
16.6
83
75
104.9
83.1
070
26.2
April
1 014.0
28.8
20.4
10.9
17.1
82
81
82.2
228.7
070
27.4
May
1 009.9
30.6
25.0
20.5
21.3
81
75
119.7
313.9
080
20.7
June
1 008.8
33.2
28.8
24.7
24.7
July
1 005.3
34.3
29.2
24.4
25.1
August
1 006.3
33.5
28.5
22.6
24.7
September
1 007.7
33.0
27.7
23.6
23.8
October
1 013.6
30.3
26.0
20.5
20.8
November
1 015.8
29.8
23.0
16.3
16.8
December
1 019.9
24.8
18.3
13.5
11.1
Year
1 012.9
34.3
23.3
5.8
18.7
2 2 2 2 2 8 I 2
79
70
192.1
404.0
220
22.0
79
71
216.4
230.3
230
23.9
81
72
177.5
308.3
240
21.4
80
68
154.8
604.0
090
26.4
74
58
201.1
44.8
080
26.7
69
63
171.3
3.5
080
31.6
64
49
177.3
Trace
070
27.0
76
68
1 811.7
2 249.1
070
25.7
Climatological Normals (1961-1990)
Mean
pressure at mean sea level
Maxi-
mum
air temp-
Mean air temp-
Mini-
mum
air temp-
Meun dew
erature
erature
erature
point
Mean relative humidity
Mean
amount
of cloud
Total bright sunshine
Totul rainfall
Prevailing wind direction
Mean wind
speed
Month
(hectopascals)
(°C)*
(°C)
('C)*
(°C)
(%)
(%)
(hours)
(mm)
(degrees) (km/h)
January
1 020.2
26.9
15.8
0.0
10.2
71
February
1 018.7
27.8
15.9
2.4
11.8
78
March
1 016.2
30.1
18.5
4.8
15.0
81
April
1 013.1
33.4
22.2
9.9
19.0
83
May
1 009.1
35.5
25.9
15.4
22.6
83
June
I 006.0
35.6
27.8
19.2
24.4
82
July
1 005.3
35.7
28.8
21.7
24.9
80
August
1 005.1
36.1
28.4
21.6
24.8
81
September
1 008.8
35.2
27.6
18.4
23.3
78
63
* * * 2 2 2 2 2 2
58
152.4
23.4
070
24.0
73
97.7
48.0
070
23.8
76
96.4
66.9
070
22.1
78
108.9
161.5
080
19.7
74
153.8
316.7
090
19.2
75
161.1
376.0
090
21.6
65
231.1
323.5
230
20.0
66
207.0
391.4
090
18.5
181.7
299.7
090
21.9
October
1 014.0
34.3
25.2
13.5
19.8
73
56
195.0
144.8
090
27.6
November
1 017.9
31.8
21.4
6.5
15.2
69
53
181.5
35.1
080
27.2
December
Year
1 020.2
28.7
17.6
4.3
11.2
68
49
181.5
27.3
080
25.5
1 012.9
36.1
23.0
0.0
18.6
77
65
1 948.1
2 214.3
080
22.6
488
Note: * These extreme values are for the period 1884–1939; 1947–1996.
Source: Royal Observatory.
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