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

Date
July
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 1006.3 31.7 29.2 26.7 25.2 79 82 7.4
2 1005.8 30.3 28.9 26.2 25.9 84 88 8.8
3 1006.1 30.7 28.5 26.7 25.4 83 87 8.4
4 1008.4 28.6 26.5 25.3 25.0 92 84 32.3
5 1009.3 31.0 27.8 26.5 25.7 89 85 27.5
6 1008.1 28.7 27.0 25.8 25.9 93 88 16.3
7 1008.5 29.8 27.3 26.0 24.9 87 88 35.8
8 1009.9 28.9 27.5 26.3 25.9 91 88 12.8
9 1009.7 32.3 29.3 27.1 25.5 81 77 1.2
10 1008.5 32.1 29.4 27.5 24.9 77 83 0.6
11 1010.1 32.7 29.5 27.6 25.3 78 68 -
12 1011.0 32.9 29.6 27.9 25.6 79 76 Trace
13 1008.8 33.5 30.2 28.2 26.0 79 67 Trace
14 1007.6 32.8 29.3 27.4 25.8 82 72 2.3
15 1007.4 32.1 28.7 27.0 25.6 84 82 8.8
16 1007.8 28.5 27.4 26.1 25.6 90 88 21.0
17 1008.9 28.8 26.2 24.4 25.2 95 88 184.6
18 1011.2 27.8 25.7 24.6 25.0 96 91 134.3
19 1009.3 30.8 27.4 24.5 25.4 89 84 12.6
20 1008.6 30.8 28.6 27.2 25.8 85 88 2.0
21 1009.4 32.2 29.3 27.6 25.6 81 79 0.2
22 1008.8 33.1 29.2 26.5 25.4 81 75 3.3
23 1005.7 28.8 27.2 25.6 24.8 87 86 46.5
24 1005.5 31.2 27.9 25.8 25.8 89 74 3.3
25 1005.1 33.1 29.6 27.7 25.6 80 55 Trace
26 1004.1 34.4 29.8 27.1 25.2 77 60 -
27 1003.4 30.6 29.0 28.0 25.3 80 80 Trace
28 1003.6 34.4 30.3 28.1 24.7 73 57 -
29 999.9 33.8 30.8 28.8 25.2 72 69 -
30 996.0 34.8 31.8 29.6 26.4 74 69 -
31 997.9 32.4 30.7 29.8 26.7 79 83 -
Mean/Total 1006.8 31.4 28.7 26.9 25.5 83 79 570.0
Normal* 1005.7 31.4 28.8 26.8 25.1 81 69 376.5
Station Hong   Kong   Observatory

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

Date
July
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 5.5 17.43 3.9 210 18.6
2 0 0.9 7.60 1.6 210 25.8
3 0 1.3 11.00 4.0 200 22.8
4 0 2.3 11.11 1.7 040 15.3
5 0 5.9 17.94 5.3 080 25.3
6 0 1.0 7.26 1.0 130 24.9
7 0 2.4 12.53 5.6 200 23.9
8 0 0.1 5.85 0.6 170 20.4
9 0 7.4 21.02 4.5 190 19.1
10 0 5.9 17.38 3.4 190 14.6
11 0 9.6 24.39 5.0 130 12.5
12 0 7.4 21.89 4.3 110 12.1
13 0 9.7 25.15 6.1 100 14.9
14 0 8.3 23.94 4.5 100 21.1
15 0 5.1 18.83 4.6 090 26.8
16 0 0.6 7.28 2.9 100 32.8
17 0 0.3 5.95 1.2 080 32.1
18 0 - 3.90 0.1 120 25.6
19 0 7.1 21.14 3.6 090 17.0
20 0 6.3 19.29 3.8 080 25.0
21 0 7.2 21.72 4.8 080 29.7
22 0 8.4 23.13 5.2 080 20.0
23 0 0.1 5.16 3.9 010 26.0
24 0 4.6 15.79 2.6 090 19.9
25 0 10.4 26.27 5.2 100 15.0
26 0 10.1 26.45 5.7 080 10.8
27 0 2.9 10.45 2.5 080 28.6
28 0 10.2 25.04 5.5 060 23.2
29 0 7.3 19.54 4.8 270 17.8
30 4 11.0 23.45 5.9 300 24.3
31 0 3.6 15.07 3.8 250 38.8
Mean/Total 4 162.9 16.55 117.6 090 22.1
Normal* 14.7§ 212.0 17.17 146.2 230 21.3
StationHong   Kong
International   Airport
King's   Park Waglan   Island^

The minimum pressure recorded at the Hong Kong Observatory was 994.1 hectopascals at 1623 HKT on 30 July.

The maximum air temperature recorded at the Hong Kong Observatory was 34.8 degrees C at 1608 HKT on 30 July.

The minimum air temperature recorded at the Hong Kong Observatory was 24.4 degrees C at 2136 HKT on 17 July.

The maximum gust peak speed recorded at Waglan Island was 75 kilometres per hour from 120 degrees at 1717 HKT on 5 July.

The maximum 1-minute mean rainfall rate recorded at the Hong Kong Observatory was 161 millimetres per hour at 2223 HKT on 7 July.

# 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: <01 Aug 2017>