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EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
APRIL 2018 (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 1014.5 27.9 23.6 21.3 18.3 73 51 -
2 1013.6 28.7 24.3 21.5 18.4 71 22 -
3 1013.6 29.4 24.7 21.9 19.4 74 38 -
4 1012.7 28.5 24.7 22.6 20.4 78 33 -
5 1011.6 27.8 24.6 22.7 20.4 78 57 -
6 1015.1 26.6 22.3 17.5 16.5 70 71 Trace
7 1023.6 20.3 18.0 16.1 5.7 45 88 Trace
8 1020.7 24.9 20.1 16.3 9.9 53 22 -
9 1017.6 26.5 22.0 19.0 17.3 75 43 -
10 1014.7 28.5 23.8 21.1 19.7 78 48 -
11 1012.3 27.6 24.6 22.5 21.5 83 75 -
12 1011.1 28.1 25.6 23.9 22.1 82 84 -
13 1011.7 30.6 26.7 24.6 22.7 79 71 Trace
14 1011.3 29.9 26.7 25.2 22.8 79 82 Trace
15 1014.2 25.7 21.0 18.6 18.4 85 89 17.2
16 1016.5 19.4 18.5 17.5 16.4 88 93 2.0
17 1017.1 22.9 19.9 17.4 16.6 82 90 0.2
18 1015.8 25.6 22.5 21.1 18.3 78 89 0.1
19 1014.6 26.3 23.2 21.4 18.7 76 78 -
20 1014.1 26.2 23.2 22.5 20.2 83 88 Trace
21 1013.1 27.5 24.5 23.0 21.4 83 83 Trace
22 1011.2 29.0 25.2 23.7 22.6 86 77 Trace
23 1009.2 30.2 26.3 24.3 22.3 79 77 Trace
24 1009.9 26.7 25.2 23.9 22.5 85 85 8.2
25 1012.1 24.7 23.7 23.3 19.7 79 85 Trace
26 1013.6 24.6 23.4 22.7 20.4 84 92 0.3
27 1015.0 28.5 24.9 22.9 21.1 80 86 Trace
28 1015.0 26.4 24.5 23.1 21.6 84 89 0.1
29 1013.3 29.3 25.6 23.9 22.2 82 74 Trace
30 1012.9 29.2 26.1 24.6 23.4 85 83 Trace
Mean/Total 1014.1 26.9 23.6 21.7 19.4 78 71 28.1
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 2018 (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 9.7 22.33 4.0 040 11.3
2 0 10.4 21.41 4.2 010 6.5
3 0 10.8 24.17 4.6 120 4.0
4 0 10.5 23.39 4.4 120 9.8
5 0 8.8 19.13 4.0 110 7.0
6 0 4.2 9.87 5.7 360 26.2
7 0 0.5 7.23 4.2 010 38.7
8 0 11.1 25.97 3.5 360 16.7
9 0 10.7 24.16 3.9 060 17.4
10 0 8.0 18.33 3.1 090 11.0
11 0 2.2 12.24 2.3 130 9.9
12 0 5.3 13.77 3.0 130 8.8
13 0 6.0 17.88 4.2 130 11.9
14 0 2.0 11.07 4.4 180 6.8
15 4 0.9 5.34 2.3 350 21.0
16 0 - 2.26 0.9 360 24.4
17 0 0.5 8.59 1.6 010 19.1
18 0 3.1 14.40 2.8 080 22.7
19 0 8.4 21.03 4.0 070 21.7
20 0 0.5 8.56 2.2 070 27.7
21 0 4.6 17.23 3.3 060 21.4
22 0 4.5 18.05 3.9 070 13.8
23 0 7.1 19.69 4.7 130 7.6
24 0 0.4 6.58 2.5 350 7.5
25 0 - 4.02 1.4 070 26.9
26 0 - 5.66 1.3 070 24.0
27 18 1.7 12.84 2.5 040 11.6
28 4 0.7 9.61 2.4 070 22.8
29 0 7.8 21.98 4.2 070 14.4
30 0 3.1 14.51 2.7 050 9.8
Mean/Total 26 143.5 14.71 98.2 070 16.1
Normal* 83.1§ 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 1007.1 hectopascals at 1526 HKT on 23 April.

The maximum air temperature recorded at the Hong Kong Observatory was 30.6 degrees C at 1352 HKT on 13 April.

The minimum air temperature recorded at the Hong Kong Observatory was 16.1 degrees C at 0338 HKT on 7 April.

The maximum gust peak speed recorded at Waglan Island was 75 kilometres per hour from 350 degrees at 1824 HKT on 6 April.

The maximum 1-minute mean rainfall rate recorded at the Hong Kong Observatory was 86 millimetres per hour at 1125 HKT on 15 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

§ 1997-2017 Mean value

Last revision date: <03 May 2018>