Skip to main content
Hong Kong Observatory Brand Hong Kong - Asia's world city
GovHK Traditional Chinese Simplified Chinese Search
Search Site Map Contact Us
red dot
Print Version
Back
Print Version PDF Version

The Weather of July 2008

    July 2008 was wetter than usual. The total rainfall in the month was 471.1 millimetres, 96.7 millimetres above normal. The accumulated rainfall since 1 January was 2382.1 millimetres, about 67 percent above the normal figure of 1429.1 millimetres for the same period. It was also the second highest for the same period since 1884.

    Under the influence of a ridge of high pressure, the weather in Hong Kong was mainly fine apart from a few isolated showers for the starting five days of the month.

    An area of low pressure over the northern part of the South China Sea followed by a trough of low pressure over the south China coastal areas brought rainy and thundery weather to the territory from 6 to 15 July. With the trough of low pressure weakening gradually, the rain eased off on 16 July and there were some sunny periods during the day.

    The weather was sunny and hot on 17 July. Under the influence of a southwesterly airstream over southern China, the weather became mainly cloudy with a few isolated showers from 18 to 20 July. A ridge of high pressure covered the south China coastal areas and brought sunny and hot weather to Hong Kong for the following six days.

    With Typhoon Fung-Wong over the western North Pacific moving towards Taiwan, the hot subsiding air ahead of Fung-Wong brought very hot weather to the territory on 27 and 28 July. The temperature at the Hong Kong Observatory on 28 July rose to 34.6 degrees, the highest of the month. Severe thunderstorms developed inland Guangdong moved south to affect the territory in the afternoon of 27 July as well as the evening of 28 July. Hails were reported at Sha Tau Kok, Fanling and Yuen Long, and squalls up to 131 kilometres per hour were recorded at Lau Fau Shan on 27 July during the passage of the thunderstorms.

    The rainbands associated with Fung-Wong brought a few showers to the territory on 29 and 30 July. There were some sunny intervals on the last day of the month.

    Two tropical cyclones occurred in the western North Pacific and the South China Sea in the month.

    Details of issuance and cancellation of various warnings/signals in the month are summarized in Tables 1.1 to 1.6.  Monthly meteorological figures and departures from normal for July are tabulated in Table 2.


 

Warnings and Signals issued in July 2008

Table 1.1   Strong Monsoon Signal
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
30 / 7 0145 30 / 7 1015


Table 1.2   Rainstorm Warning Signals
Colour Beginning Time Ending Time
Day/Month HKT Day/Month HKT
Amber 6 / 7 1735 6 / 7 1920
Amber 8 / 7 0915 8 / 7 1045
Amber 10 / 7 0635 10 / 7 1115
Amber 12 / 7 0215 12 / 7 0300
Red 12 / 7 0300 12 / 7 0710
Amber 12 / 7 0710 12 / 7 0745
Amber 14 / 7 2325 15 / 7 0130


Table 1.3   Landslip Warning
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
10 / 7 0905 10 / 7 1725


Table 1.4   Thunderstorm Warning
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
1 / 7 0425 1 / 7 0500
5 / 7 1215 5 / 7 1415
5 / 7 1450 5 / 7 1600
6 / 7 0145 6 / 7 0600
6 / 7 0915 6 / 7 1430
6 / 7 1605 6 / 7 2000
7 / 7 0245 7 / 7 1030
7 / 7 1220 7 / 7 1330
7 / 7 2120 8 / 7 0030
8 / 7 0720 8 / 7 1145
8 / 7 1540 8 / 7 1645
8 / 7 1845 8 / 7 2000
8 / 7 2305 9 / 7 1430
9 / 7 1630 9 / 7 1900
9 / 7 2255 10 / 7 1200
10 / 7 1340 10 / 7 1500
11 / 7 0210 11 / 7 0900
11 / 7 2015 11 / 7 2215
11 / 7 2315 12 / 7 0730
13 / 7 0305 13 / 7 0700
13 / 7 1045 13 / 7 1445
14 / 7 1350 14 / 7 1500
14 / 7 1705 15 / 7 0730
15 / 7 1300 15 / 7 1615
16 / 7 1220 16 / 7 1430
19 / 7 0810 19 / 7 1100
19 / 7 1930 19 / 7 2030
20 / 7 1305 20 / 7 1415
21 / 7 0205 21 / 7 0430
27 / 7 1415 27 / 7 1800
28 / 7 1810 28 / 7 2030
28 / 7 2120 28 / 7 2300
30 / 7 0540 30 / 7 0745
31 / 7 1410 31 / 7 1615


Table 1.5   Very Hot Weather Warning
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
21 / 7 1430 22 / 7 1620
26 / 7 1620 28 / 7 2315


Table 1.6   Special Announcement on Flooding
in the Northern New Territories
Beginning Time Ending Time
Day/Month HKT Day/Month HKT
10 / 7 0600 10 / 7 1340


Table 2   Figures and Departures from Normal - July 2008
Meteorological Element Figure of the Month Departure from Normal*
Mean Daily Maximum Air Temperature 31.0 degrees C 0.3 degree below normal
Mean Air Temperature 28.4 degrees C 0.3 degree below normal
Mean Daily Minimum Air Temperature 26.5 degrees C 0.2 degree below normal
Mean Dew Point Temperature 24.9 degrees C 0.1 degree below normal
Mean Relative Humidity 82 % 1 % above normal
Mean Cloud Amount 70 % 2 % above normal
Total Rainfall 471.1 mm 96.7 mm above normal
Number of hours of Reduced VisibilityΔ 29 hours 10.5 hours above normal§
Total Bright Sunshine Duration 179.0 hours 35.9 hours below normal
Mean Daily Global Solar Radiation 16.91 Megajoule / square metre 0.61 Megajoule below normal
Total Evaporation 132.3 mm^ 23.2 mm below normal


  Remarks : All measurements were made at the Hong Kong Observatory except sunshine, solar radiation and evaporation which were recorded at King's Park Meteorological Station and visibility which was observed at the Hong Kong International Airport.

  Δ

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.


  *   Departure from 1971 - 2000 climatological normal, except for number of hours of reduced visibility

  §   Departure from mean value between 1997 and 2007

  ^  Total for 30 days
Last revision date: <20 Dec 2012>