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EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG, DECEMBER 1999

EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
DECEMBER 1999

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 1019.7 23.6 20.5 17.8 11.8 57 51 -
2 1022.4 22.3 20.0 18.4 12.5 62 60 -
3 1023.7 19.9 18.2 16.2 13.1 73 90 8.7
4 1021.8 20.2 18.7 16.7 13.3 71 96 0.7
5 1020.6 21.0 18.7 17.5 12.8 68 85 Trace
6 1022.5 18.2 16.7 15.0 8.7 60 83 Trace
7 1024.0 19.0 16.8 15.0 6.0 49 49 -
8 1022.6 20.6 17.9 15.0 6.8 49 12 -
9 1020.2 21.7 18.7 16.0 7.9 50 12 -
10 1018.6 22.3 19.2 16.7 12.3 65 38 -
11 1019.6 23.2 20.1 17.8 11.2 58 45 -
12 1019.4 20.7 19.8 19.2 12.8 65 84 Trace
13 1018.3 22.3 20.3 19.2 15.3 74 74 Trace
14 1017.9 22.2 20.2 18.7 10.7 56 84 -
15 1017.7 22.0 19.6 17.6 11.2 59 83 -
16 1017.0 19.8 18.5 17.2 14.5 78 94 2.8
17 1017.0 17.5 16.9 15.9 14.8 88 99 10.8
18 1020.3 16.6 14.5 13.5 12.1 86 100 5.6
19 1022.4 16.1 14.2 12.3 9.2 73 89 4.3
20 1025.2 15.2 12.5 10.4 1.5 47 4 -
21 1028.4 13.4 10.6 8.3 -4.2 36 0 -
22 1030.2 10.2 8.5 6.7 -8.1 30 1 -
23 1028.0 12.0 9.2 5.8 -7.2 31 1 -
24 1024.2 16.2 12.7 8.7 -5.8 27 0 -
25 1022.3 16.6 13.7 10.6 -0.3 40 0 -
26 1022.1 18.1 15.0 12.0 5.9 57 29 -
27 1022.5 17.8 16.4 15.3 10.0 66 87 Trace
28 1020.9 21.1 18.1 16.3 13.0 72 43 -
29 1018.0 20.1 17.8 16.2 13.8 78 64 -
30 1016.3 22.3 18.7 15.9 13.4 72 8 -
31 1017.1 21.1 18.9 17.3 11.3 63 1 -
Mean/Total 1021.3 19.1 16.8 14.8 8.4 60 51 32.9
Normal 1020.2 20.5 17.6 15.4 11.2 68 49 27.3
Station Hong   Kong   Observatory

Date
DECEMBER
Total
Bright
Sunshine
(hours)
Daily
Global Solar
Radiation
(MJ/m2)
Total
Evaporation
(mm)
Prevailing
Wind
Direction
(degrees)
Mean
Wind
Speed
(km/h)
1 8.9 14.21 3.5 010 20.9
2 8.4 14.57 3.6 040 32.5
3 - 4.73 1.3 040 33.8
4 0.1 3.67 1.4 010 31.0
5 2.2 9.73 3.5 360 36.0
6 - 4.83 3.1 010 36.9
7 6.0 12.38 3.3 010 26.0
8 9.3 14.61 3.6 010 23.0
9 9.7 15.16 3.7 010 24.3
10 6.7 12.64 2.8 030 16.8
11 6.6 13.61 3.5 020 23.8
12 - 4.13 2.6 070 33.6
13 1.5 9.61 2.7 070 25.3
14 3.9 9.51 3.5 010 25.5
15 6.1 11.74 3.9 070 27.1
16 - 2.12 0.6 010 28.3
17 - 2.48 0.5 010 28.1
18 - 2.35 0.1 010 30.1
19 0.6 8.55 3.4 010 37.5
20 9.7 15.04 3.7 010 39.6
21 9.8 15.63 4.3 010 40.7
22 9.7 15.52 3.8 010 48.3
23 10.1 15.74 3.3 010 27.7
24 9.9 16.30 4.3 010 34.6
25 9.7 15.71 2.4 010 16.6
26 8.0 14.38 3.2 070 25.5
27 0.1 4.86 1.2 060 32.6
28 7.2 12.73 2.2 040 15.9
29 1.7 8.22 1.3 040 13.1
30 9.6 14.66 2.7 030 12.7
31 9.9 15.27 3.3 040 19.1
Mean/Total 165.4 10.80 86.3 010 28.0
Normal 181.5 12.03 111.5 080 25.5
Station King's   Park Waglan   Island^

The minimum pressure recorded at the Hong Kong Observatory was 1013.8 hectopascals at 1437 HKT on 30 December.

The maximum air temperature recorded at the Hong Kong Observatory was 23.6 degrees C at 1536 HKT on 1 December.

The minimum air temperature recorded at the Hong Kong Observatory was 5.8 degrees C at 0551 HKT on 23 December.

The maximum gust peak speed recorded at Waglan Island was 83 kilometres per hour from 010 degrees at 0415 HKT on 22 December.

The maximum instantaneous rate of rainfall recorded at King's Park was 56 millimetres per hour at 1612 HKT on 3 December.

^ 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.