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EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
DECEMBER 2018 (Table 1)

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 1018.3 24.2 22.1 21.1 18.1 78 56 -
2 1016.4 24.3 22.4 21.2 19.3 83 51 -
3 1016.5 26.0 23.7 22.0 19.8 79 58 -
4 1016.0 27.1 24.8 22.7 20.6 78 58 -
5 1015.5 24.8 23.6 22.5 20.3 82 82 Trace
6 1015.5 25.1 23.3 21.6 20.4 84 83 0.1
7 1018.5 23.3 21.1 18.5 19.1 88 90 1.0
8 1021.6 19.7 18.0 16.7 13.7 76 88 -
9 1021.5 18.3 17.0 16.4 12.6 75 90 Trace
10 1019.7 18.3 17.0 15.1 12.6 75 88 0.2
11 1020.3 20.4 18.0 16.5 12.0 68 84 Trace
12 1024.2 16.5 14.9 13.7 8.9 67 84 -
13 1025.1 18.1 15.6 13.5 9.6 68 86 -
14 1025.3 18.2 16.8 15.5 11.7 72 88 -
15 1023.5 21.2 18.9 17.2 14.3 75 64 -
16 1022.0 20.9 19.3 18.0 14.6 74 88 Trace
17 1022.2 21.0 18.0 15.6 9.1 56 38 -
18 1022.2 20.2 18.1 16.2 10.1 60 38 -
19 1019.5 21.5 19.9 18.5 16.0 78 78 -
20 1016.5 23.2 21.6 20.1 18.8 84 80 -
21 1016.1 25.0 22.4 21.4 19.9 86 68 -
22 1017.0 25.2 22.2 20.0 18.0 77 66 -
23 1017.6 22.5 20.1 17.5 18.2 89 96 10.5
24 1017.5 19.0 18.0 16.8 15.6 86 99 0.1
25 1015.5 21.1 19.7 18.5 16.3 81 90 -
26 1014.3 23.6 20.9 18.7 18.0 84 27 -
27 1016.6 22.8 20.6 18.9 16.7 79 77 Trace
28 1021.6 20.2 18.1 16.3 12.6 70 79 Trace
29 1026.1 16.3 14.0 12.5 8.2 68 87 Trace
30 1026.5 15.4 12.6 10.3 6.7 67 83 Trace
31 1027.0 15.6 13.2 11.8 7.4 68 77 -
Mean/Total 1019.9 21.3 19.2 17.6 14.8 76 75 11.9
Normal* 1020.5 20.2 17.9 15.9 11.9 69 52 26.8
Station Hong   Kong   Observatory

EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
DECEMBER 2018 (Table 2)

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 0 6.2 13.00 2.1 060 27.7
2 0 9.3 15.31 1.9 060 21.5
3 2 7.2 13.66 2.3 040 15.0
4 0 9.1 17.37 2.9 020 10.5
5 0 0.6 4.79 1.7 070 35.0
6 0 2.0 9.40 1.6 070 25.2
7 1 - 1.21 1.9 070 34.3
8 0 0.2 6.09 2.3 010 29.7
9 0 0.5 4.26 1.3 010 24.9
10 0 0.1 3.74 1.2 360 21.4
11 0 4.9 12.68 3.9 350 29.7
12 0 - 4.58 1.7 360 33.6
13 0 2.6 10.85 2.6 360 27.8
14 0 - 4.94 1.5 010 25.6
15 11 6.6 12.90 1.8 050 22.6
16 6 1.2 8.41 3.6 360 20.5
17 0 8.4 15.07 2.6 360 22.9
18 0 8.5 14.90 2.5 070 27.9
19 0 6.4 13.78 2.5 060 31.5
20 0 2.0 8.02 1.5 040 16.9
21 2 8.7 15.47 3.0 070 21.2
22 0 7.1 13.52 2.4 050 21.9
23 0 - 4.34 1.5 360 27.9
24 0 - 3.90 1.3 360 27.8
25 6 0.1 7.02 0.8 060 25.8
26 17 9.4 16.11 2.1 110 5.9
27 6 3.5 10.06 2.7 070 27.3
28 0 6.8 14.58 4.5 360 34.8
29 0 0.6 7.31 3.1 360 40.3
30 1 5.6 12.23 2.6 360 37.6
31 0 4.4 11.52 2.6 360 26.8
Mean/Total 52 122.0 10.03 70.0 360 25.9
Normal* 212.8§ 172.2 10.89 83.7 070 26.0
StationHong   Kong
International   Airport
King's   Park Waglan   Island^

The minimum pressure recorded at the Hong Kong Observatory was 1012.2 hectopascals at 1455 HKT on 26 December.

The maximum air temperature recorded at the Hong Kong Observatory was 27.1 degrees C at 1226 HKT on 4 December.

The minimum air temperature recorded at the Hong Kong Observatory was 10.3 degrees C at 0827 HKT on 30 December.

The maximum gust peak speed recorded at Waglan Island was 63 kilometres per hour from 040 degrees at 0104 HKT on 30 December.

The maximum 1-minute mean rainfall rate recorded at King's Park was 13 millimetres per hour at 1937 HKT on 23 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.

* 1981-2010 Climatlogical Normal, unless otherwise specified

§ 1997-2017 Mean value

Last revision date: <03 Jan 2019>