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EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG, OCTOBER 2008

EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
OCTOBER 2008

Date
OCTOBER
Mean
Pressure
(hPa)
Air   Temperature Mean
Dew Point
Temperature
(deg. C)
Mean
Relative
Humidity
(%)
Mean
Amount
of Cloud
(%)
Total
Rainfall
(mm)
Maximum
(deg. C)
Mean
(deg. C)
Minimum
(deg. C)
1 1012.7 30.0 27.0 24.8 21.0 70 80 -
2 1012.6 30.1 27.0 24.8 23.1 80 83 3.0
3 1011.4 28.4 26.3 25.5 23.1 83 85 2.4
4 1009.4 30.7 27.4 25.2 24.7 86 89 14.0
5 1007.9 27.8 25.9 23.5 23.6 87 90 122.6
6 1009.7 26.1 24.2 22.9 19.5 75 81 Trace
7 1013.2 25.2 23.7 22.5 19.6 78 88 Trace
8 1013.8 27.3 25.5 23.7 21.3 78 85 0.5
9 1015.5 29.6 26.7 24.6 22.0 75 72 Trace
10 1016.1 30.7 27.4 25.4 22.0 73 40 -
11 1015.8 30.0 27.3 25.5 22.4 75 48 -
12 1014.7 27.2 26.2 25.7 21.2 74 88 Trace
13 1014.5 26.2 25.3 24.4 20.5 75 88 0.3
14 1015.9 29.4 26.1 24.0 21.1 74 83 Trace
15 1015.6 29.8 26.5 24.6 21.1 72 55 Trace
16 1013.2 30.6 26.8 24.7 22.1 76 57 -
17 1012.6 28.8 26.5 25.6 23.1 81 82 0.1
18 1014.6 30.3 27.1 25.8 22.7 77 77 -
19 1014.4 30.2 27.0 25.1 22.5 77 61 1.6
20 1014.1 30.1 26.9 25.4 21.9 74 49 Trace
21 1013.8 29.5 26.7 25.3 22.0 76 49 -
22 1013.0 30.4 26.8 24.8 22.6 78 33 -
23 1013.6 29.7 27.4 25.2 22.2 74 43 -
24 1017.1 29.5 27.3 25.8 22.5 75 76 Trace
25 1017.9 29.1 26.5 25.5 21.9 76 86 Trace
26 1017.1 30.4 27.0 25.2 22.9 79 44 -
27 1017.4 29.5 26.8 25.4 22.5 78 66 Trace
28 1016.2 28.8 26.0 24.3 21.5 76 57 0.1
29 1014.5 28.8 26.3 24.9 21.9 77 76 -
30 1015.0 29.5 27.0 25.5 22.8 78 72 -
31 1015.4 28.9 26.9 26.0 23.2 81 69 -
Mean/Total 1014.1 29.1 26.5 24.9 22.1 77 69 144.6
Normal* 1014.0 27.7 25.3 23.4 19.9 74 57 151.9
Station Hong   Kong   Observatory

Date
OCTOBER
Number of hours
of Reduced
Visibility#
(hours)
Total
Bright
Sunshine
(hours)
Daily
Global Solar
Radiation
(MJ/m2)
Total
Evaporation
(mm)
Prevailing
Wind
Direction
(degrees)
Mean
Wind
Speed
(km/h)
1 16 4.5 13.72 4.8 360 19.9
2 14 5.7 15.52 4.2 080 26.9
3 11 0.9 6.57 1.4 080 43.2
4 2 4.8 15.75 4.2 120 29.6
5 0 0.6 4.59 2.8 140 40.9
6 0 2.6 10.90 2.7 360 27.5
7 0 - 6.40 2.9 360 22.6
8 2 2.6 11.89 3.2 070 31.2
9 0 9.4 20.31 4.4 070 34.6
10 1 10.0 21.03 4.5 070 27.7
11 6 10.3 21.19 5.5 080 37.0
12 23 0.7 7.96 3.7 080 46.0
13 6 - 6.75 2.4 070 41.0
14 20 7.8 15.84 4.1 070 28.2
15 1 9.7 20.70 4.6 070 34.4
16 15 8.4 16.37 3.7 070 19.6
17 1 2.6 10.05 1.8 080 29.8
18 0 5.9 16.18 3.7 080 34.3
19 0 7.3 17.72 5.0 080 24.3
20 0 10.6 20.77 4.9 080 28.5
21 0 6.8 16.24 3.6 080 24.3
22 0 9.1 17.94 3.6 080 13.0
23 8 8.4 15.76 4.1 220 5.9
24 23 5.9 14.68 5.1 080 27.2
25 12 3.3 11.49 2.7 080 35.2
26 22 7.7 17.45 4.0 070 18.9
27 24 5.7 12.58 3.4 080 27.2
28 13 9.3 18.23 4.4 090 26.5
29 4 6.1 14.67 3.1 070 25.5
30 6 7.1 16.36 3.9 080 24.8
31 0 6.8 14.93 3.3 070 27.4
Mean/Total 230 180.6 14.53 115.7 080 28.5
Normal* 165.1§ 191.1 14.46 136.4 080 28.7
Station Hong   Kong
International   Airport
King's   Park Waglan   Island^

The minimum pressure recorded at the Hong Kong Observatory was 1005.3 hectopascals at 1647 HKT on 5 October.

The maximum air temperature recorded at the Hong Kong Observatory was 30.7 degrees C at 1349 HKT on 4 October and at 1239 HKT on 10 October.

The minimum air temperature recorded at the Hong Kong Observatory was 22.5 degrees C at 0639 HKT on 7 October.

The maximum gust peak speed recorded at Waglan Island was 101 kilometres per hour from 210 degrees at 1932 HKT on 5 October.

The maximum instantaneous rate of rainfall recorded at the Hong Kong Observatory was 219 millimetres per hour at 0950 HKT on 5 October.

# Reduced visibility refers to visibility below 8 kilometres when there is no fog, mist, or precipitation.

-The visibility readings at the Hong Kong International Airport are based on hourly observations by professional meteorological observers in 2004 and before, and average readings over the 10-minute period before the clock hour of the visibility meter near the middle of the south runway from 2005 onwards. The change of the data source in 2005 is an improvement of the visibility assessment using instrumented observations following the international trend.

-Before 10 October 2007, the number of hours of reduced visibility at the Hong Kong International Airport in 2005 and thereafter displayed in this web page was based on hourly visibility observations by professional meteorological observers. Since 10 October 2007, the data have been revised using the average visibility readings over the 10- minute period before the clock hour, as recorded by the visibility meter near the middle of the south runway.

^ In case the data are not available from Waglan Island, observations of Cheung Chau or other nearby weather stations will be incorporated in computing the Prevailing Wind Direction and Mean Wind Speed.

* 1971-2000 Climatological Normal, unless otherwise specified

§ 1997-2007 Mean value