268
Appendix 39
(Chapter 18: The Environment)
Climatological Summary, 1977
Mean Maxi-
pressure
mum
Month
Mini- Mean mum at mean air tem- air tem- air tem- sea level perature perature perature
Mean
Mean Mean
Total
Prevailing
Mean
dew relative amount point humidity of cloua
bright Total
wind
wind
sunshine rainfall_direction
speed
kilopascals
°C
°C
°C
°C per cent per cent
hours mm
points
m/s
January
101-97
22.6
13.7
6.2
9.7
77
74
93.2
20-1
N
6.7
February
102-19
25.4
14.0
6-8
7.9
69
53
146-5
3.2
ENE
6-2
March
101.91
28.0
19.9
11.6
14.5
73
51
182.0
4.0
NE
4.7
April
101.35
31.8
24.2
17.6
20.4
80
May
100-91
33.6
27.8
22.8
24.3
82
June
100-62
32.9
28-8
24.3
25-5
83
July
100-48
33-8
28.7
24-7
25-6
84
2828
74
144.9
46.7
E
5.2
66
217.9
296.1
E
4.9
73
175.9
258-4
SW
5.6
69
189-5
276.1
E
5.3
August
100-47
34.9
29.0
24.6
25.1
80
68
219-1 149.7
SW
3.9
September
100-75
33.8
27.8
21.3
22-7
75
67
167.6
415.9
N
5.8
October
101.63
31.2
25-7
21.6
21.3
77
48
230-5 195.8
November
101-92
29.1
20-7
13.6
12-9
62
41
237-3
6-1
I Z
E
5.8
N
7.3
December
101.95
24.9
19.4
13.6
14.5
75
50
196.9
7.9
ENE
6.0
Mean
101-35
23.3
18-7
76
61
5.6
Total
2201-3 1680-0
Climatological Normals
(1884-1939; 1947–60)
Month
kilopascals °C⭑
°C
*C*
°C per cent per cent
hours
points
m/s
January
101.99
26.9
15.4
0.0
11.1
75
64
145-4
31.7
E
6.6
February
101-84
27.8
15.2
2.4
11.7
79
75
100-2
46.9
ENE
6.5
March
101.61
30-1
17.5
6.2
14.8
83
82
94.7
72.2
ENE
6.0
April
101-27 33-4 (21-3
9.9
18.8
85
80
114.6 135-8
E
5.2
May
100.92
35.5 25-2
15.4
22.4
85
76
156-1
292-7
E
5-2
June
100-59
July
35.6
100-49 35.7 27.9
27-3
19-2
24.2
84
78
159.9 401.2
SW
5.8
22.2 24-7
83
69
213-7 371-7
SW
5-1
August
100-49
36.1
27.7
21.6
24.6
84
67
200-9
370-8
E
5-1
September
100-84
35.2
27.1
18.4
23.1
October
101.38
34.3
24-6
14-1
19.3
November
101-75
31.8
20-9
6.5
15-1
December
101.97
28.7
17.3
4.3
11.9
70
AN OR
79
61
197-5 278.8
72
51
218-9 99.2
69
53
187-9
43.1
屋屋屋
E
5-8
E
7.3
E
7.4
55
172-6 24.9
E
6.9
Mean
101.26
22.3
18-5
79
68
E
6.1
Total
1-963-1 2168-8
|
* 1884–1939; 1947–77.
Note:
1 kilopascals 10 millibars 1 m/s 1.943 844 5 knots