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,
APRIL 2017 (Table 1)

Date
April
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 1019.9 23.9 18.7 15.5 13.0 70 35 0.2
2 1021.5 24.2 19.9 17.0 12.5 64 17 -
3 1020.8 24.5 20.7 17.5 14.4 68 22 -
4 1018.4 26.0 21.9 19.3 17.6 77 51 -
5 1014.8 27.9 23.4 20.9 19.8 81 80 -
6 1012.5 25.0 23.5 22.5 21.3 87 86 0.3
7 1012.4 27.9 24.5 22.6 21.6 84 63 -
8 1012.2 27.5 25.0 23.0 22.1 85 62 -
9 1009.4 27.9 25.8 23.5 22.9 84 77 -
10 1006.6 28.1 27.0 26.3 23.8 83 87 Trace
11 1007.7 27.8 26.1 22.2 24.4 90 89 0.6
12 1013.2 22.8 20.6 18.2 18.8 89 88 21.5
13 1017.4 21.5 20.0 18.8 16.4 80 86 Trace
14 1015.2 24.7 21.9 19.9 17.9 78 81 -
15 1013.5 26.9 23.6 21.6 21.1 86 84 -
16 1013.3 30.2 25.7 23.0 22.2 82 58 Trace
17 1010.9 29.4 26.0 23.7 22.0 79 61 Trace
18 1008.9 30.7 26.7 23.9 22.6 79 48 -
19 1009.1 29.4 26.7 24.7 22.5 78 49 -
20 1009.8 27.5 26.1 25.1 23.6 86 84 3.1
21 1008.1 29.4 26.2 22.8 24.0 88 90 7.8
22 1012.9 24.5 20.6 18.5 16.7 79 90 6.6
23 1014.8 21.8 20.8 19.9 17.7 83 88 1.4
24 1014.3 22.8 21.5 20.9 18.5 83 88 Trace
25 1012.4 22.9 21.9 20.7 20.6 92 89 10.9
26 1010.9 26.8 23.7 22.4 22.9 95 89 2.9
27 1012.5 24.0 22.3 20.6 20.2 88 89 3.5
28 1015.2 24.8 21.8 20.2 16.8 74 67 -
29 1014.4 27.3 23.0 19.9 18.3 75 35 -
30 1013.3 28.2 24.0 21.4 19.3 75 25 -
Mean/Total 1013.2 26.2 23.3 21.2 19.8 81 69 58.8
Normal* 1012.9 25.0 22.6 20.8 19.4 83 81 174.7
Station Hong   Kong   Observatory

EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
APRIL 2017 (Table 2)

Date
April
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 10.1 25.74 3.7 010 24.1
2 0 10.9 26.48 4.8 090 30.8
3 0 10.6 24.28 3.9 080 34.0
4 0 9.9 23.93 3.7 080 31.4
5 0 6.5 20.50 3.3 050 22.0
6 0 - 7.51 1.4 050 17.3
7 1 5.1 16.61 2.9 140 6.8
8 0 2.2 11.69 1.9 050 6.8
9 0 2.3 12.40 2.4 190 12.0
10 0 0.2 4.77 1.3 200 27.7
11 1 - 4.27 1.7 210 17.0
12 0 0.2 3.78 3.2 020 26.3
13 0 - 6.37 1.6 040 22.8
14 0 4.0 15.57 2.4 080 17.5
15 0 4.9 17.01 2.7 040 12.2
16 3 7.5 21.39 3.9 070 12.5
17 0 8.8 24.31 4.9 220 15.7
18 1 10.5 22.61 4.5 250 23.5
19 0 10.5 24.74 4.5 250 19.5
20 0 1.2 6.58 1.5 170 17.4
21 0 0.6 5.42 4.5 180 25.2
22 0 0.1 4.96 2.1 010 26.1
23 0 - 4.15 0.8 070 23.7
24 0 0.1 7.47 1.3 070 32.4
25 1 - 3.19 0.9 080 25.2
26 1 1.0 10.40 2.5 050 12.7
27 0 0.1 4.32 2.2 010 26.9
28 0 2.3 16.03 2.4 090 17.7
29 0 9.9 22.61 3.3 160 9.6
30 0 10.8 23.90 3.9 120 7.3
Mean/Total 8 130.3 14.10 84.1 070 20.1
Normal* 86.9§ 101.7 11.60 83.8 070 20.9
StationHong   Kong
International   Airport
King's   Park Waglan   Island^

The minimum pressure recorded at the Hong Kong Observatory was 1004.1 hectopascals at 1638 HKT on 10 April.

The maximum air temperature recorded at the Hong Kong Observatory was 30.7 degrees C at 1508 HKT on 18 April.

The minimum air temperature recorded at the Hong Kong Observatory was 15.5 degrees C at 0523 HKT on 1 April.

The maximum gust peak speed recorded at Waglan Island was 92 kilometres per hour from 300 degrees at 1634 HKT on 21 April.

The maximum 1-minute mean rainfall rate recorded at the Hong Kong Observatory was 103 millimetres per hour at 1622 HKT on 21 April.

# 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: <04 May 2017>