APPENDICES
APPENDIX 45
(Chapter 22: The Environment)
Climatological Summary, 1991
Month
Mean
pressure at mean sea level
Maxi-
mum
air tem-
Mini-
Mean air tem-
mum
Mean
Mean
Mean
Total
Prevailing
Mean
air tem-
dew
perature
perature
perature
point
relative humidity
amount
bright
Total
wind
wind
of cloud
sunshine
rainfall
direction
speed
hectopascals
°C
°C
°C
°C
per cent
per cent
hours
mm
degrees
km/h
January
1 020.0
23.9
16.9
11.7
13.5
81
73
109.9
28.7
090
30.0
February
1 019.4
22.5
17.1
11.5
12.5
75
64
116.4
8.2
080
27.5
March
1 016.0
27.7
20.3
11.9
17.9
86
81
75.6
51.5
050
23.6
April
1 013.7
30.4
22.8
12.1
19.2
81
73
128.7
34.7
080
20.6
May
1011.6
33.4
26.5
18.2
22.9
81
71
201.3
60.9
100
22.5
June
1 006.5
34.4
28.4
22.8
24.6
81
74
163.9
371.7
160
18.8
July
1 005.7
34.5
28.9
24.5
24.9
80
70
208.0
293.6
200
26.8
August
1 005.1
33.0
28.6
24.7
25.2
82
65
163.2
302.3
030
19.3
September
1 007.4
33.7
28.1
21.8
23.1
75
58
160.3
178.7
010
21.3
October
1 013.4
30.8
24.8
16.8
18.3
69
49
200.3
294.3
090
25.1
November
1 019.5
27.0
21.0
15.8
14.4
68
51
177.4
2.7
080
27.5
December
1 020.9
25.1
18.4
4.6
13.9
76
66
131.6
11.8
080
27.3
Year
1 013.2
34.5
23.5
4.6
19.2
78
66
1 836,6
1 693.1
080
24.2
Climatological Normals (1961-1990)
Month
hectopascals
°C*
°C
°C*
°C
per cent
per cent
hours
mm
degrees
km/h
January
1 020.2
26.9
15.8
0.0
10.2
71
58
152.4
23.4
070
24.0
February
1 018.7
27.8
15.9
2.4
11.8
78
73
97.7
48.0
070
23.8
March
1016.2
30.1
18.5
4.8
15.0
81
76
96.4
66.9
070
22.1
April
1013.1
33.4
22.2
9.9
19.0
83
78
108.9
161.5
080
19.7
May
1 009.1
35.5
25.9
15.4
22.6
83
74
153.8
316.7
090
19.2
June
1 006.0
35.6
27.8
19.2
24.4
82
75
161.1
376.0
090
21.6
July
1 005.3
35.7
28.8
21.7
24.9
80
65
231.1
323.5
230
20.0
August
1 005.1
36.1
28.4
21.6
24.8
81
66
207.0
391.4
090
18.5
September
1 008.8
35.2
27.6
18.4
23.3
78
63
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
1 020.2
28.7
17.6
4.3
11.2
68
49
181.5
27.3
080
25.5
Year
1 012.9
36.1
23.0
0.0
18.6
77
65
1948.1 2214.3
080
22.6
Note: * These extreme values are for the period 1884–1939; 1947–1991.
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