HONG KONG CLIMATE
TEMPERATURE
30
40
RELATIVE HUMIDITY
°C
%
50
90
1981 - 2010
MEAN MONTHLY
RELATIVE HUMIDITY
MÉAN DALY MAY
ONTHLY MEAN MEAN'DAILY MIN
20
20
AIR TEMPERATURE
MONTHLY RAINFALL
mm
1400
1200
1000
80
800
70
600
60
400
200
10
50
MONTH 1 2 3 4 5 6 7 8 9 10 11 12 MONTH
Beaufort Scale and Equivalent Speeds
MONTH
0
1887
1983
1983
2000
1889
8002
1994
1914
1974
1974
1952
1995
1 2 3 4 5 6 7 8 9 10 11 12
Descriptive Terms
Calm
Light
Moderate
Fresh
Strong
Sustained Wind Speed in km/h
0-1
2-12
13-30
31-40
41 - 62
Gale
63-87
Storm
Hurricane
88 - 117 >=118
Beaufort Force
0
1-2
WIND
3-4
N
5
6-7
8-9
10 - 11
12
1-2
3-4 5-6
>=7 Beaufort Force
2-12 13-30 31-50
>=51 Wind speed in km/h
Beaufort Scale - An international system for
describing wind force
km/h - 1 km/h is 1 kilometre per hour
The number in the inner circle is the percentage frequency of occurrence of calm and variable winds
N
WIND ROSE
HONG KONG OBSERVATORY
HEADQUARTERS
(1981-2010)
Data source: Hong Kong Observatory
•15%
-20%-
25%
·30%·
35%
40%
·45%-
E
W
WIND ROSE
WAGLAN ISLAND (1981 - 2010)
0:6
·10%
·15%
-20%
·25%
30%
35%
-40%
·45%
Frequency of Occurrence of Wind Direction and Speed
at the Hong Kong Observatory Headquarters and Waglan Island
Monthly Prevailing Wind Direction and Mean Speed Observed at Waglan Island (1981 - 2010)
km/h 25.3
24.5
23.0
JAN
FEB
MAR
20.9
19.7
APR MAY
22.9
JUN
21.3
19.4
22.6
JUL AUG SEP
27.4
OCT
1995
YEAR RECORDEC
MAXIMUM MONTHLY
(1884 - 1939)
&
(1947 - 2013)
,1997
WETTEST
YEAR
MEAN MONTHLY (1981 - 2010)
RAINFALL
MONTH