Skip to main content
Hong Kong Observatory Brand Hong Kong - Asia's world city
GovHK Traditional Chinese Simplified Chinese Search
Search Site Map Contact Us
Print Version
Back
Print Version

EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
DECEMBER 2017 (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 1018.8 23.2 21.2 19.7 16.2 73 74 Trace
2 1019.1 22.9 20.1 17.5 15.0 73 65 -
3 1017.7 22.9 20.6 18.9 16.1 76 52 -
4 1018.3 22.3 20.1 18.0 14.7 71 36 -
5 1020.0 20.4 18.9 17.7 13.5 71 78 -
6 1018.5 21.1 18.8 17.5 13.9 73 41 -
7 1018.2 21.8 19.4 17.8 13.4 69 57 -
8 1021.2 19.4 17.6 15.3 6.5 49 9 -
9 1019.7 18.0 15.5 13.3 6.8 56 15 -
10 1018.2 20.4 17.8 14.9 9.7 60 37 -
11 1018.3 21.1 18.9 17.0 10.4 58 57 -
12 1018.4 20.6 18.6 17.4 12.9 70 83 Trace
13 1017.7 19.0 18.4 17.9 14.7 79 89 Trace
14 1018.1 21.1 19.3 18.0 15.3 78 84 Trace
15 1019.2 21.3 19.6 18.5 16.2 81 79 -
16 1023.4 19.5 15.8 12.2 9.7 67 69 -
17 1026.6 14.0 12.3 10.8 5.8 64 81 -
18 1025.5 15.8 12.8 9.8 4.4 57 23 -
19 1025.6 16.5 13.6 10.7 2.1 46 40 -
20 1027.3 17.8 15.2 12.4 1.5 40 29 -
21 1025.7 17.0 15.0 12.4 5.2 53 23 -
22 1021.2 19.1 16.8 14.5 10.0 65 52 -
23 1017.5 21.1 19.0 17.1 14.0 73 91 -
24 1018.1 23.1 20.2 18.1 11.7 60 28 -
25 1019.8 19.7 17.7 16.3 7.6 53 64 -
26 1021.0 19.7 17.6 16.3 12.5 73 69 -
27 1021.2 19.4 17.6 16.2 13.1 75 51 -
28 1020.7 20.6 18.5 17.1 14.1 76 84 Trace
29 1021.3 21.5 19.0 17.7 14.9 77 46 -
30 1021.6 22.6 19.5 17.6 14.1 71 44 -
31 1021.5 21.0 18.1 15.9 11.4 65 33 Trace
Mean/Total 1020.6 20.1 17.8 16.0 11.2 66 54 Trace
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 2017 (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 3.7 10.29 3.1 360 27.0
2 0 8.5 14.54 2.5 360 23.5
3 3 7.6 14.34 2.6 010 15.2
4 2 9.4 16.00 3.4 360 18.4
5 0 2.7 8.11 2.2 010 23.3
6 0 8.8 15.49 2.4 070 28.2
7 4 5.0 11.45 3.9 070 24.6
8 0 9.6 16.14 4.2 360 39.4
9 20 9.3 14.70 2.2 080 18.9
10 20 7.3 13.57 3.9 010 12.4
11 0 9.6 15.63 2.9 070 28.6
12 0 2.7 10.11 2.7 070 36.3
13 0 0.2 4.52 2.5 070 48.6
14 5 4.0 10.57 2.1 070 37.7
15 3 5.2 12.53 2.9 070 32.5
16 0 6.1 13.81 4.3 360 43.5
17 5 0.2 6.49 2.7 360 39.4
18 14 9.4 16.23 2.5 360 32.7
19 0 7.8 15.90 4.6 360 38.7
20 0 9.2 17.41 5.1 360 36.3
21 0 9.4 17.52 2.9 070 37.5
22 0 8.9 15.21 2.5 050 31.8
23 5 0.3 6.51 1.9 040 17.4
24 11 9.4 15.62 5.2 360 22.8
25 0 8.6 14.97 2.9 360 29.1
26 1 7.3 13.47 2.6 070 33.8
27 0 9.2 16.47 3.3 070 37.1
28 2 2.9 9.26 1.7 060 29.4
29 3 9.1 16.63 2.8 070 21.9
30 5 8.7 16.25 3.6 050 23.7
31 3 9.5 16.49 2.8 360 27.4
Mean/Total 106 209.6 13.43 94.9 070 29.6
Normal* 218.1§ 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 1015.1 hectopascals at 1501 HKT on 23 December.

The maximum air temperature recorded at the Hong Kong Observatory was 23.2 degrees C at 1521 HKT on 1 December.

The minimum air temperature recorded at the Hong Kong Observatory was 9.8 degrees C at 0644 HKT on 18 December.

The maximum gust peak speed recorded at Waglan Island was 77 kilometres per hour from 360 degrees at 1809 HKT on 16 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

§ 1997-2016 Mean value

Last revision date: <02 Jan 2018>