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EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
MAY 2017 (Table 1)

Date
May
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 1012.6 29.5 25.0 22.6 21.4 81 58 -
2 1011.9 28.1 26.1 24.3 23.3 85 83 -
3 1011.4 31.3 27.5 25.6 24.0 82 79 Trace
4 1011.9 27.6 24.9 22.9 23.2 90 84 42.5
5 1013.7 29.8 26.1 23.4 22.4 81 59 -
6 1014.8 31.1 27.5 25.3 23.4 79 65 Trace
7 1014.6 27.7 25.6 24.8 23.0 86 82 1.8
8 1012.0 28.6 25.9 23.1 22.9 83 87 9.2
9 1012.4 29.3 25.9 22.6 22.3 81 77 10.8
10 1013.8 29.6 27.1 25.3 23.5 81 84 -
11 1013.8 31.6 27.5 25.7 23.9 81 77 -
12 1010.9 30.7 27.5 26.0 22.8 76 86 Trace
13 1010.2 26.6 25.8 24.5 22.1 80 85 4.7
14 1010.4 29.5 26.7 24.8 23.9 85 76 Trace
15 1008.7 27.0 25.5 24.6 24.3 94 86 38.5
16 1007.6 26.6 25.0 23.6 22.3 85 84 3.0
17 1009.7 29.9 26.0 23.8 21.5 77 76 -
18 1012.0 27.4 25.5 24.3 20.5 74 86 0.1
19 1011.0 26.0 24.6 23.7 21.0 80 88 0.7
20 1008.7 24.8 23.9 22.7 21.8 88 88 0.3
21 1007.7 24.9 23.9 23.0 22.2 90 88 4.4
22 1008.1 25.2 24.6 23.8 23.4 93 88 5.6
23 1007.8 28.5 26.1 24.6 24.9 93 86 4.1
24 1006.8 26.2 25.3 24.2 24.5 95 92 273.6
25 1008.7 28.5 25.5 23.9 21.6 79 84 -
26 1010.2 26.8 25.0 23.9 20.3 76 72 -
27 1010.0 30.4 26.1 24.0 18.6 65 56 Trace
28 1009.6 30.5 26.7 24.8 20.0 68 43 -
29 1009.9 30.3 26.6 24.9 21.4 74 48 -
30 1009.4 30.9 27.0 25.1 23.2 80 70 Trace
31 1006.6 31.3 28.2 25.6 24.1 79 69 -
Mean/Total 1010.5 28.6 26.0 24.2 22.5 82 77 399.3
Normal* 1009.3 28.4 25.9 24.1 22.6 83 76 304.7
Station Hong   Kong   Observatory

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

Date
May
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 7.5 18.64 3.2 090 11.2
2 0 2.4 11.56 2.1 130 8.1
3 0 3.9 16.23 7.5 130 12.2
4 0 0.2 3.92 2.8 150 12.8
5 13 5.4 17.22 3.2 170 5.1
6 13 7.1 16.80 3.1 100 10.1
7 0 2.5 10.44 2.6 090 28.4
8 0 5.3 18.22 5.7 090 19.5
9 5 6.8 19.24 3.3 310 6.1
10 13 1.3 11.00 2.0 090 7.0
11 0 6.4 20.01 3.6 080 15.1
12 0 5.6 19.67 4.4 120 11.8
13 0 - 6.34 1.6 300 6.2
14 0 3.1 14.26 6.5 140 10.8
15 0 0.1 4.85 1.4 160 17.6
16 0 1.0 8.90 1.9 010 21.9
17 0 9.0 22.86 4.2 080 14.9
18 0 1.4 13.69 3.1 080 36.0
19 0 0.1 7.76 1.7 070 36.3
20 0 - 5.38 0.5 070 31.5
21 0 0.1 5.65 0.3 080 38.4
22 0 0.1 4.61 0.6 090 34.0
23 1 4.8 17.11 0.9 100 15.9
24 1 - 1.79 0.6 350 15.3
25 0 3.4 12.21 2.2 360 18.9
26 0 0.1 9.40 2.4 040 17.8
27 0 7.5 23.58 5.1 080 23.9
28 0 11.5 26.79 5.6 090 27.7
29 0 10.5 26.64 5.0 080 31.4
30 0 7.4 21.51 3.9 080 18.5
31 0 11.5 27.04 5.2 220 12.0
Mean/Total 46 126.0 14.30 96.2 080 18.6
Normal* 45.4§ 140.4 14.19 110.7 080 19.7
StationHong   Kong
International   Airport
King's   Park Waglan   Island^

The minimum pressure recorded at the Hong Kong Observatory was 1004.2 hectopascals at 1616 HKT on 31 May.

The maximum air temperature recorded at the Hong Kong Observatory was 31.6 degrees C at 1336 HKT on 11 May.

The minimum air temperature recorded at the Hong Kong Observatory was 22.6 degrees C at 0408 HKT on 1 May.

The maximum gust peak speed recorded at Waglan Island was 62 kilometres per hour from 080 degrees at 2245 HKT on 18 May.

The maximum 1-minute mean rainfall rate recorded at King's Park was 184 millimetres per hour at 1054 HKT on 4 May.

# 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 Jun 2017>