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EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
JULY 2018 (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 1004.1 32.9 30.2 28.0 25.6 77 81 4.1
2 1003.4 30.6 29.5 25.6 25.9 81 88 2.1
3 1002.5 30.5 29.7 27.0 26.1 81 88 15.4
4 1002.2 32.6 30.3 28.4 25.9 78 88 3.4
5 1002.3 31.6 30.0 28.4 25.8 78 88 1.5
6 1002.6 32.1 30.1 27.6 26.1 80 88 5.0
7 1003.3 30.0 29.0 26.4 26.0 84 87 5.2
8 1004.4 30.6 28.2 26.7 26.0 88 87 14.4
9 1005.7 31.8 28.2 25.9 25.3 85 83 11.3
10 1005.1 32.6 29.0 26.8 25.0 80 57 1.3
11 1001.8 32.8 29.6 27.2 24.5 74 56 -
12 1003.3 33.4 30.0 28.3 25.5 77 85 Trace
13 1003.9 28.7 26.7 25.9 25.5 93 92 50.4
14 1004.0 29.5 27.0 25.3 25.3 91 90 52.7
15 1004.0 28.3 26.6 25.0 24.7 89 92 67.4
16 1003.8 31.4 28.2 25.7 24.6 81 80 5.8
17 1002.4 34.3 30.0 26.9 25.4 78 83 6.5
18 1003.9 29.5 27.7 26.4 25.5 88 89 29.6
19 1004.6 29.7 27.9 26.6 25.6 87 85 17.3
20 1003.8 31.6 28.2 26.0 25.7 87 71 7.1
21 1002.6 33.1 29.5 27.4 24.5 75 54 -
22 1002.3 32.4 29.0 27.9 24.4 76 67 Trace
23 1001.8 31.2 28.4 26.3 26.0 87 81 30.8
24 1003.6 32.0 29.8 28.0 26.0 80 84 0.1
25 1005.8 31.7 29.4 27.0 26.1 83 70 2.7
26 1006.5 32.3 29.6 27.3 26.1 82 82 3.4
27 1006.7 33.0 29.8 27.7 25.5 78 77 0.3
28 1006.7 33.7 30.2 28.2 25.1 75 55 -
29 1005.8 34.3 30.2 27.9 24.7 73 41 -
30 1005.6 33.7 30.4 28.1 25.0 74 53 -
31 1005.5 33.2 30.2 27.1 25.3 76 65 3.3
Mean/Total 1004.0 31.8 29.1 27.0 25.4 81 77 341.1
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 2018 (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 8.7 23.48 6.0 230 28.1
2 0 1.6 9.83 4.4 220 29.6
3 0 0.4 7.66 2.5 220 31.3
4 0 9.0 23.17 4.9 220 32.4
5 0 2.6 11.43 3.1 210 28.9
6 0 6.0 18.60 3.2 190 20.0
7 0 0.2 6.23 2.0 190 13.5
8 0 3.5 16.21 3.6 040 17.1
9 0 7.0 20.93 5.4 060 32.5
10 0 8.9 22.52 5.3 090 23.1
11 0 12.0 26.10 5.7 220 13.4
12 0 8.5 23.11 7.5 080 19.2
13 0 - 3.87 2.3 080 24.9
14 0 0.8 10.20 4.3 090 37.8
15 0 0.3 4.48 4.9 080 46.6
16 0 5.6 20.80 4.3 070 41.8
17 0 8.0 23.25 6.7 070 29.8
18 0 1.0 7.56 2.4 090 42.3
19 0 2.3 11.82 2.7 080 36.5
20 0 6.4 20.02 4.1 080 26.1
21 0 8.0 20.37 4.9 230 12.2
22 0 9.3 22.08 4.8 230 15.0
23 0 1.0 8.16 3.8 120 26.0
24 0 4.2 15.96 3.2 140 30.9
25 0 7.5 19.64 4.4 110 15.6
26 0 7.9 23.00 4.9 120 14.8
27 0 8.9 24.17 5.4 140 11.4
28 0 11.1 26.77 6.3 120 10.5
29 0 10.0 24.27 5.8 200 9.0
30 0 10.7 25.57 5.9 220 12.0
31 0 9.7 24.89 6.4 230 18.9
Mean/Total 0 181.1 17.62 141.1 090 24.2
Normal* 14.2§ 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 999.1 hectopascals at 1655 HKT on 11 July.

The maximum air temperature recorded at the Hong Kong Observatory was 34.3 degrees C at 1608 HKT on 17 July and at 1433 HKT on 29 July.

The minimum air temperature recorded at the Hong Kong Observatory was 25.0 degrees C at 1326 HKT on 15 July.

The maximum gust peak speed recorded at Waglan Island was 99 kilometres per hour from 100 degrees at 0144 HKT on 15 July.

The maximum 1-minute mean rainfall rate recorded at King's Park was 143 millimetres per hour at 1138 HKT on 9 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

§ 1997-2017 Mean value

Last revision date: <02 Aug 2018>