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EXTRACT OF METEOROLOGICAL OBSERVATIONS FOR HONG KONG,
JULY 2008

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 1010.9 31.7 28.5 26.2 25.1 83 78 4.0
2 1010.6 32.2 28.8 27.0 24.5 78 61 Trace
3 1010.7 32.3 29.1 27.2 24.6 77 52 -
4 1009.4 32.7 29.0 27.1 24.9 79 56 -
5 1007.3 32.7 28.9 26.0 26.0 85 73 11.6
6 1005.3 28.9 25.8 24.2 25.0 96 85 54.4
7 1001.5 26.6 25.5 24.5 24.8 96 91 39.4
8 1005.6 28.5 26.8 24.4 25.0 90 90 51.3
9 1008.7 27.7 25.6 24.5 25.1 97 89 43.3
10 1007.3 27.9 26.2 23.6 24.9 93 90 59.9
11 1004.6 27.8 26.3 24.6 24.4 90 87 12.8
12 1004.2 27.2 25.1 22.9 23.7 92 91 114.3
13 1005.7 28.6 26.1 24.7 24.3 90 88 11.7
14 1006.9 31.4 27.6 25.4 25.3 88 84 30.7
15 1004.5 30.8 27.4 24.9 25.4 89 86 33.8
16 1002.8 31.5 28.2 26.6 25.3 84 70 Trace
17 1003.1 31.7 29.1 26.9 24.9 78 44 -
18 1004.5 31.0 29.2 27.9 25.3 80 83 Trace
19 1006.7 30.8 29.1 27.9 25.6 82 83 3.9
20 1008.3 32.8 29.6 28.4 25.3 78 81 -
21 1007.3 33.2 29.9 28.3 25.2 76 70 Trace
22 1005.9 31.4 29.5 28.1 24.4 75 66 Trace
23 1006.5 31.8 29.5 28.1 24.4 74 59 -
24 1007.4 32.5 29.6 27.6 24.0 72 23 -
25 1006.3 32.3 29.6 27.5 24.3 74 13 -
26 1005.5 32.6 30.2 27.8 24.3 71 20 -
27 1003.5 33.3 29.8 27.8 23.7 70 53 Trace
28 998.8 34.6 31.0 28.3 25.0 71 40 Trace
29 998.0 32.5 30.5 29.1 26.0 77 88 Trace
30 1001.9 30.4 29.2 28.4 25.9 82 85 Trace
31 1007.8 31.1 28.8 26.9 25.0 80 86 Trace
Mean/Total 1005.7 31.0 28.4 26.5 24.9 82 70 471.1
Normal* 1005.5 31.3 28.7 26.7 25.0 81 68 374.4
Station Hong   Kong   Observatory

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 6.7 21.21 5.2 180 17.8
2 0 9.2 23.89 4.6 170 15.1
3 0 9.2 22.33 5.6 200 10.8
4 0 10.2 25.44 - 130 7.7
5 0 9.0 26.00 5.9 120 14.5
6 0 2.7 10.22 3.1 110 24.9
7 0 - 4.54 3.4 100 24.3
8 0 - 6.20 4.1 230 15.6
9 0 - 5.00 3.3 040 9.3
10 0 0.5 4.27 1.6 290 19.4
11 0 2.4 8.84 N.A. 240 15.1
12 0 - 6.05 2.2 210 12.1
13 0 0.4 6.58 0.6 280 9.4
14 0 4.8 14.91 4.6 170 8.5
15 0 6.1 17.98 3.4 080 11.2
16 0 4.8 12.64 3.3 110 6.8
17 0 12.1 27.10 6.2 240 16.5
18 0 5.0 16.34 3.0 250 30.0
19 0 5.2 18.50 4.5 230 28.7
20 0 5.7 20.24 5.7 240 20.5
21 0 10.3 26.75 6.9 240 20.3
22 0 8.8 21.56 6.3 230 24.2
23 0 9.5 25.67 6.1 210 19.2
24 0 11.5 27.73 6.8 230 17.5
25 0 11.7 26.70 6.0 260 18.4
26 0 11.3 25.02 8.4 270 17.3
27 1 8.1 18.51 5.9 270 18.0
28 15 10.3 22.12 4.7 280 26.0
29 13 - 10.30 4.4 250 32.4
30 0 - 7.32 2.9 230 31.5
31 0 3.5 14.32 3.6 090 15.7
Mean/Total 29 179.0 16.91 132.3& 240 18.0
Normal* 18.5§ 214.9 17.52 155.5 230 21.9
Station Hong   Kong
International   Airport
King's   Park Waglan   Island^

The minimum pressure recorded at the Hong Kong Observatory was 995.9 hectopascals at 1608 HKT on 28 July and at 0415 HKT on 29 July.

The maximum air temperature recorded at the Hong Kong Observatory was 34.6 degrees C at 1447 HKT on 28 July.

The minimum air temperature recorded at the Hong Kong Observatory was 22.9 degrees C at 0253 HKT on 12 July.

The maximum gust peak speed recorded at Waglan Island was 83 kilometres per hour from 300 degrees at 0907 HKT on 10 July.

The maximum instantaneous rate of rainfall recorded at the Hong Kong Observatory was 211 millimetres per hour at 0335 HKT on 10 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.

* 1971-2000 Climatological Normal, unless otherwise specified

§ 1997-2007 Mean value

& Total for 30 days

  

Last revision date: <23 Jan 2015>