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

Date
January
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 1020.5 19.0 17.3 16.3 13.3 78 75 -
2 1019.3 19.2 17.8 16.0 13.9 78 77 -
3 1018.5 22.0 19.4 18.2 14.9 76 79 -
4 1016.7 20.5 18.8 18.1 15.7 82 86 0.2
5 1015.3 22.8 19.3 17.2 17.1 87 88 0.2
6 1014.6 17.3 16.2 15.9 15.0 92 94 3.7
7 1014.3 17.6 16.8 15.7 15.7 93 95 16.2
8 1015.2 18.7 15.1 9.5 14.3 95 91 11.6
9 1023.1 10.7 9.0 7.9 5.9 82 97 9.9
10 1024.9 15.2 12.8 10.5 1.5 46 82 Trace
11 1026.1 16.1 13.8 12.1 1.0 42 37 Trace
12 1027.1 15.3 12.8 10.5 1.3 46 11 -
13 1026.0 14.6 12.9 11.3 6.8 67 18 -
14 1022.9 17.2 14.2 12.0 8.7 70 11 -
15 1018.9 18.2 15.3 13.0 11.6 79 16 -
16 1015.4 22.6 17.8 14.8 13.1 75 23 -
17 1014.4 25.5 19.8 15.9 11.5 60 9 -
18 1016.6 24.0 19.2 15.9 14.7 76 39 -
19 1017.8 19.3 18.6 17.9 16.7 89 92 0.8
20 1016.8 22.7 19.1 17.4 15.3 79 70 Trace
21 1015.6 21.5 18.7 16.8 15.3 81 78 -
22 1013.9 24.8 20.0 17.1 16.3 80 62 -
23 1015.3 22.8 19.2 17.2 15.3 78 79 -
24 1015.5 18.6 17.7 16.6 13.8 78 80 -
25 1015.7 18.8 17.2 16.1 13.4 79 82 -
26 1017.2 18.3 17.1 15.6 14.5 85 95 Trace
27 1017.0 17.1 15.5 14.0 12.2 81 90 Trace
28 1014.7 18.4 16.5 12.6 13.3 81 88 -
29 1020.1 12.9 10.5 8.9 6.5 76 94 0.1
30 1020.4 11.0 10.1 8.9 7.0 82 100 0.2
31 1021.0 10.6 9.4 7.8 7.4 87 86 19.3
Mean/Total 1018.4 18.5 16.1 14.1 11.7 77 69 62.2
Normal* 1020.3 18.6 16.3 14.5 11.4 74 61 24.7
Station Hong   Kong   Observatory

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

Date
January
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 21 3.0 9.99 2.4 070 28.4
2 10 3.6 10.18 2.4 060 31.8
3 0 8.4 14.62 1.9 060 32.3
4 0 0.6 6.88 1.3 060 32.4
5 7 0.2 6.04 0.9 060 25.5
6 0 - 2.07 2.0 060 47.3
7 0 - 4.28 0.1 050 32.9
8 0 - 1.00 2.3 360 28.8
9 2 - 3.00 2.4 350 38.5
10 0 2.9 9.28 3.3 360 33.9
11 0 9.3 18.11 4.2 360 31.0
12 0 9.8 18.46 2.6 360 30.3
13 0 9.7 18.19 2.5 070 42.8
14 0 9.9 18.15 1.9 060 30.5
15 0 9.6 17.80 1.7 060 24.9
16 0 9.6 17.33 2.0 040 13.9
17 11 9.8 16.78 2.5 030 9.4
18 2 9.0 17.36 1.8 040 22.3
19 1 - 2.82 0.9 050 22.0
20 2 7.7 15.37 2.4 060 26.1
21 11 4.9 11.64 1.9 060 23.3
22 19 8.0 13.95 2.1 020 8.5
23 9 4.7 12.85 2.5 070 23.9
24 0 7.7 14.94 2.8 060 41.8
25 0 5.7 13.73 2.4 060 40.3
26 5 0.2 4.73 1.2 060 30.8
27 2 1.6 8.92 1.7 060 36.4
28 8 - 4.18 2.2 360 22.0
29 0 - 3.04 0.9 350 34.3
30 2 - 2.05 1.3 030 33.0
31 0 0.2 4.16 2.0 350 37.1
Mean/Total 112 136.1 10.38 62.5 060 29.6
Normal* 232.2§ 143.0 10.17 71.3 060 25.3
StationHong   Kong
International   Airport
King's   Park Waglan   Island^

The minimum pressure recorded at the Hong Kong Observatory was 1004.6 hectopascals at 1614 HKT on 23 January.

The maximum air temperature recorded at the Hong Kong Observatory was 25.5 degrees C at 1551 HKT on 17 January.

The minimum air temperature recorded at the Hong Kong Observatory was 7.8 degrees C at 2312 HKT on 31 January.

The maximum gust peak speed recorded at Waglan Island was 79 kilometres per hour from 360 degrees at 2200 HKT on 8 January.

The maximum 1-minute mean rainfall rate recorded at the Hong Kong Observatory was 59 millimetres per hour at 0647 HKT on 7 January.

# 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: <01 Feb 2018>