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EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG, DECEMBER 2008

EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
DECEMBER 2008

Date
DECEMBER
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 1021.8 21.6 18.3 16.0 11.2 64 5 -
2 1018.7 22.6 18.9 16.4 10.8 61 10 -
3 1015.5 21.6 19.9 17.5 13.9 69 57 Trace
4 1017.8 24.0 22.0 20.1 15.6 67 82 0.2
5 1023.7 20.1 17.8 16.2 6.8 49 63 Trace
6 1025.1 17.9 15.6 13.9 2.6 42 38 -
7 1023.3 17.7 15.7 13.0 6.6 55 55 0.4
8 1021.0 20.7 17.6 15.1 5.0 44 51 Trace
9 1018.4 21.7 18.1 15.2 8.4 54 8 -
10 1018.5 22.2 18.9 16.2 9.1 55 7 -
11 1017.3 23.8 20.3 17.4 10.5 54 28 -
12 1015.7 20.6 19.9 19.1 15.1 74 88 -
13 1017.2 24.4 21.6 19.8 14.6 65 79 -
14 1020.4 21.1 19.1 16.6 9.0 52 47 -
15 1020.9 19.0 16.5 14.3 9.7 64 12 -
16 1020.1 20.1 17.0 14.7 11.1 69 15 -
17 1020.5 21.4 18.0 15.2 11.1 65 13 -
18 1020.3 22.5 18.9 16.4 11.3 62 13 -
19 1020.1 22.2 19.3 17.1 12.4 65 44 -
20 1018.3 23.7 20.1 17.5 14.5 72 7 -
21 1018.6 23.9 21.1 19.3 13.3 61 37 -
22 1022.8 20.4 16.5 12.9 7.7 56 28 Trace
23 1023.6 16.9 14.1 11.5 6.8 61 68 -
24 1019.9 20.8 18.0 15.0 10.1 60 87 -
25 1019.5 22.1 19.6 17.6 13.3 67 76 -
26 1020.5 20.1 18.6 17.1 13.5 72 85 Trace
27 1018.5 20.7 19.0 17.8 14.2 74 88 Trace
28 1017.3 20.3 19.3 18.0 15.8 80 92 0.1
29 1017.3 23.2 20.6 17.8 15.8 75 88 2.0
30 1019.9 18.3 16.7 15.7 13.9 84 88 5.2
31 1022.3 16.2 14.5 12.5 9.5 73 88 1.1
Mean/Total 1019.8 21.0 18.4 16.2 11.1 63 50 9.0
Normal* 1020.5 20.3 17.8 15.7 11.6 69 51 34.5
Station Hong   Kong   Observatory

Date
DECEMBER
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 2 9.6 16.56 2.3 060 19.5
2 4 9.8 17.43 3.4 080 19.7
3 0 2.7 7.81 2.0 050 27.4
4 6 2.3 8.63 4.6 040 26.0
5 4 9.0 15.31 5.0 360 39.6
6 0 8.1 14.93 3.3 360 32.5
7 0 5.0 11.18 2.2 050 29.1
8 0 6.9 13.11 2.7 360 21.8
9 1 9.7 16.19 2.3 010 16.5
10 7 9.7 17.27 3.3 050 21.6
11 17 9.6 15.68 3.6 010 11.7
12 12 0.1 5.91 1.6 070 32.1
13 20 3.2 10.01 4.2 020 15.6
14 22 6.7 11.87 3.2 360 25.2
15 24 8.3 12.91 2.1 010 23.3
16 24 8.7 13.38 2.1 050 20.3
17 24 9.4 15.26 3.2 050 14.9
18 8 9.4 15.93 3.4 080 22.6
19 8 8.8 16.09 2.5 060 31.6
20 7 9.5 16.19 3.1 040 21.2
21 0 8.7 15.98 3.9 030 17.0
22 15 9.4 14.42 4.4 360 36.9
23 12 8.2 14.68 3.2 360 24.0
24 12 2.8 10.58 3.1 010 15.0
25 19 7.3 12.72 3.1 060 18.8
26 11 4.5 12.13 2.9 070 42.9
27 4 0.5 6.83 2.2 070 26.8
28 1 - 2.98 0.7 040 17.9
29 9 0.5 6.83 1.6 010 22.0
30 5 0.1 4.23 1.2 360 25.5
31 5 - 5.90 3.1 360 35.3
Mean/Total 283 188.5 12.22 89.5 360 24.3
Normal* 247.6§ 173.3 11.13 94.5 070 26.5
Station Hong   Kong
International   Airport
King's   Park Waglan   Island^

The minimum pressure recorded at the Hong Kong Observatory was 1013.3 hectopascals at 1534 HKT on 3 December.

The maximum air temperature recorded at the Hong Kong Observatory was 24.4 degrees C at 1249 HKT on 13 December.

The minimum air temperature recorded at the Hong Kong Observatory was 11.5 degrees C at 0516 HKT on 23 December.

The maximum gust peak speed recorded at Waglan Island was 68 kilometres per hour from 360 degrees at 0259 HKT and 0416 HKT on 5 December.

# 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